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Download "SOLIDWORKS Flow Simulation - Tank Sloshing and Baffle Design"

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engineering
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mechanical engineering
product design
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solidworks
flow
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tank
slosh
baffle
design
how
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liquid
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training
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sloshing
dissipate
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00:00:01
[Music]
00:00:07
okay hey there everybody
00:00:09
i am siobhani i am with go engineer
00:00:12
i am a simulation specialist out of our
00:00:14
houston office
00:00:15
and this video is on tank sloshing in
00:00:18
solidworks flow simulation
00:00:20
so what i'd like you to do is consider
00:00:23
first what is tank sloshing
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we're going to overarching answer this
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question how do i analyze it
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and what do i need to know about it what
00:00:31
do i need to know in advance to even be
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able to set this up
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so i want you to consider a partially
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filled tanker
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in a breaking condition the liquid
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inside its tank will continue to move
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forward
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slamming into the walls like we see here
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then sloshing back and forth in waves
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so it begs questions like how much force
00:00:53
did that just apply on the tank in the
00:00:57
x direction will it cause a dangerous
00:01:00
pitching moment or potentially how long
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will the waves last
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are they going to dissipate out faster
00:01:07
in certain baffle configurations or not
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what is the best baffle configuration i
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am out of houston so many of my
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customers are in the energy sector
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and do model baffles for
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situations exactly like this so using
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solidworks
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we are going to use some pre-defined
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baffle designs
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and then using solidworks flow
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stimulation will determine which design
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is the best now why am i doing that
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let's take a look at
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physics that i need to be aware of
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before i'm running a
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simulation study or picking a simulation
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program right
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these are common physical effects that i
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might need to
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understand about water so droplet
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meniscus gas and liquid
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interaction the fluid flow
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absorbing heat evaporation boiling
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basically phase change
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if i'm talking about fluid in a tanker
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it's moving pretty fast
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it's the volume of the fluid really
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driving the motion
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droplets and small details like the
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meniscus are not
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affecting the overall flow so that's a
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concept of surface tension
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and we don't need to worry about it we
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can leave that math out
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also phase change can be ignored we're
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not really focusing on
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heat in this tanker right now so cooling
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down or heating up
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so kind of focusing just on the
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interface of liquid and gas and then how
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everything is flowing
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which makes this a really good use case
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for flow simulation okay
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all right and another big thing um
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we get hours we get results within a few
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hours
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rather than a few days you can quickly
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get results when you're using an
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integrated software like this
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so what did we do on the top left hand
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corner you should be able to
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see the baseline design it's just a
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six foot tank or a 12 foot long tank
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it's three foot diameter wide or in diameter
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and i've called that design zero here
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and then from here i built out different
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baffle designs
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in the configuration tab let's go find
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solidworks
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you'll see that i set up three different
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configurations here i did that
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intentionally
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so that i could quickly copy studies
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over
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in the flow simulation projects and then
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compare results easily as well
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all three of these designs have a
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similar arrangement of the baffles you'll see i
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have two long
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plates and then i have three
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cross-sectional plates
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but the cutouts are varying in each one
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you'll see design one
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has an open surface area about 1830.
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it's more of a single channel
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it's my uh leading towards the idea of
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like a suppressor on a gun
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so mostly a single channel that the
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fluid is flowing through
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the second option was leading more
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towards the perforated plate
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so smaller similarly shaped holes that
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are
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more spread out and then the third
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design was more of a combination
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cool so those are the three that um i
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came up with i didn't take these from
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any customer so they're not you know
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industry standards but i
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i just came up with this so we're going
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to see how they all compare against each
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other
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we're kind of dealing with a meniscus
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layer so let's jump into the general
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settings
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and i'm dealing with not a meniscus but
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immiscible
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so we have two immiscible fluids are air
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in our water and that is
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what is going to be involved in that
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tank there
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they are treated as homogeneous as well
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the interface is called
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a free surface that's a name used by
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solidworks and
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and generally to refer to the fluid
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interact that that layer in between and
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it's also what flow simulation uses to
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refer to the calculation method you see
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that here
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also the tank is considered to be
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positioned
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horizontally like this where the center
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of the earth is
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in the negative y direction so we see
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that 1g loading
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there but i'm also simulating a breaking
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condition
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and so i am simulating that with a
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acceleration curve in the positive x
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direction you see that dependency option
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there so it's created using dependencies
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so the g load is applied over four
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seconds
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see that curve here it's peaking at
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about half a g that's what this value is and that's a
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common g loading for an average
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driving situation on the driver the
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analysis overall is run for 10 seconds
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so i can watch the loads under braking
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and then the after effects of the wave
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to see how fast that dissipates
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awesome so gravity free surface
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otherwise we have
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default wall conditions default initial
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conditions
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and my initial fluid in the tank is air
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all right now for all three designs
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i have or four designs i have an initial
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fluid of water
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here at the bottom of my tank to
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set that up in flow sim
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i need to create an initial condition so
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you're going to go find initial
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conditions in your tree or in your menu
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and add one you're going to select your
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solid body or your part file
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representing your volume of water
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be sure to select disable solid
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components
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and then come here to this drop down and
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pick which fluid you want it to be
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from here you can see that i left
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default thermodynamic parameters
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and zeros on my velocities that is
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because at the initial start time the water
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is moving zero inches per second
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relative
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to the velocity of the tank right so
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it's there's no initial velocity here or
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initial impulse load
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if i was trying to represent a situation
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more like slamming into a brick wall
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instantaneously
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it make more it might make more sense to
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actually have a velocity input here
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that is not this case so
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now i have a volume of water sitting
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here at the bottom and then i have my my
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air on top
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now since this is an internal analysis
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with no flow rates into or exiting the
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tank
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i have learned it is a good practice to
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create a fluid subdomain so again you're going
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to find that your trigger in your menu
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now you're going to right click on your
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tank select other
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in my case you're trying to click an
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inside face it could be a face of the
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water or face of the tank itself
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select it like so and then make sure
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it's set to an immiscible mixture with
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air and water
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okay i'm gonna go ahead and cancel out
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of that
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it's just a step that i would do
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all right that generally completes the
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analysis setup
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i'm going to talk a little bit more
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about extra options things like goals
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and mesh
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so in my goals these are the things that
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i am choosing to track
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because it matters most to my design for
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a tank
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breaking i mentioned a few questions at
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the beginning of the webinar
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so i was saying i cared about force in
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the direction of breaking so the x
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direction i care about pitching moment
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so that's about the z axis so talk about the z
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axis
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and then i i cared about just the
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overall turbulent energy it was a way
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for me to measure how much
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waves uh still needed to dissipate so i
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i captured bulk average turbulent energy
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you'll see i have other goals in this
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list
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things like forces in the other
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directions or moments in the other
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directions
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absolutely an option for you to pick
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you'll see i also have a few things
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up here at the top um these are more
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sanity checks
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they aren't necessary for the results i
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want to look at at the end
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but while it's solving i do like to look
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at these things
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it's a personal preference it's like i
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said a sanity check
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so velocity or pressure is one of my
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ways of sanity checking
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a free surface or really any um
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analysis i'm running in flow and i'm
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just watching for weird
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pressures or velocities so that's why i
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have this in here
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and then i've got volume fraction of air
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and water so i
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this case those are fixed volumes i want
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to make sure those stay fixed right
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and that i didn't mix something up
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in case you're brand new to flow these
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are global goals that's what gg stands
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for so it's measuring that over the entire
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3d volume
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okay so that was my goal setup let me
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get a little bit into meshing
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and i'm going to hide this water so it's
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not in our way
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so i didn't do anything crazy with mesh
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you can see i did not do
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a local initial mesh or a localized area
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of mesh refinement
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that is because it is
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important for me to kind of um okay so
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we're using the volume of fluid method
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so for accurate answers i need a good
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representation of
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the volume of the fluid right that just
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seems logical if i have
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fluid cells that are too large i'm not
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capturing that
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interface or that free surface very well
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and so i'm getting a very blurry
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strange kind of result so it is
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recommended that you do refine
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anywhere that there's going to be a
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fluid interface
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and for a tank like this that sloshing
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could really be anywhere
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so i'm talking about refining everything
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in that tank
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this level one refinement this is what i
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use for my comparison studies it is still a
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little bit large
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but it is fine-tuned enough to get me
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detailed answers
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and to converge on results and to
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quickly get me answers more importantly
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within an overnight solve scenario
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so that i can compare those within a day
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right
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if i then picked a final design and i
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wanted a more detailed
00:11:08
set of results i would bump up this
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refinement level to at least two
00:11:12
you can go higher than that of course
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depending on how much ram you have
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and solve time you want to dedicate so
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how did i do this setup
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i'm going to scroll up and go to this
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refining cells drop down
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you can see here i slid over the
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refining fluid cell slider bar
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over to one so
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that's that's me showing the one level
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of refinement or the one time
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smaller that i chose there for the
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entire fluid domain
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and i can prove that out in my solutions
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or my results
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take a look at that mesh there it is
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that one level of refinement
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like i said good for a comparison study
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i would do something smaller for a final
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test result
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now before i jump into the results
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actually there is some subtle things i
00:11:58
did in the calculation control options
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so let's go take a look at that
00:12:03
it's starting with thinking ahead on
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what kinds of results that i want
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specifically animations over time and i
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get that in this
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saving tab so this is best tracked using
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the transient explorer
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these can be heavy on file size so be
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very careful of the results you're
00:12:21
choosing to export
00:12:24
immiscible is recommended especially in
00:12:26
a case like this with fixed fluids
00:12:29
what is not recommended is mass fraction
00:12:32
and i pulled that here to remind myself
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to tell you that
00:12:35
when you're dealing with a situation
00:12:37
like this where you have
00:12:39
two fluids with vastly different
00:12:40
densities if you have a small pocket of
00:12:43
or a small volume of air that has a
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little bit of water in it
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the density of that water or the mass
00:12:50
fraction of that water
00:12:51
overrides that cell and makes it look
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like there's a lot of water in that cell
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when there really isn't so mass fraction
00:12:57
can be misleading
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in free surface situations like this
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with a gas and a liquid
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okay so what i would do normally get the
00:13:06
dot dot dot here is pick volume fraction
00:13:08
if i wanted more of a distribution and i
00:13:11
would definitely do an immiscible choice
00:13:15
i have this mass fraction here if we
00:13:16
have some extra time at the end i can
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show you a comparison
00:13:20
okay what else is in this calculation
00:13:23
control option so on the solving tab
00:13:25
you'll see i left the time step on auto
00:13:28
that is to keep this the most accurate
00:13:30
if i was troubleshooting or just really
00:13:32
quickly trying to push a result out
00:13:35
i would likely make this a manual time
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step of a larger number
00:13:40
something like 0.01 seconds potentially
00:13:43
i'm introducing error when i do that but
00:13:45
helps me get to an answer quicker
00:13:48
so i can make design decisions i'm not
00:13:50
doing any automatic refinement
00:13:52
i don't want to increase my solve time
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and on my finishing tab
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you can see i have this running for 10
00:13:58
seconds of the tank time
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now i'm going to back up for a second
00:14:03
and take it aside here
00:14:05
and talk about batch runs for my four
00:14:07
different designs
00:14:10
and my personal recommendation on this
00:14:12
you'll see i have
00:14:13
calculation time turned on here with
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five hours of calculation time chosen
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um this is you and me time our our real
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lifetime
00:14:23
by limiting this to five hours of solve
00:14:25
time
00:14:26
and running two
00:14:30
uh projects simultaneously i can get a
00:14:33
majority of the way
00:14:34
through all four calculations overnight
00:14:37
they might not all finish but i can get
00:14:39
a majority of the way through them
00:14:41
uh thus when i return in the next day in
00:14:44
the morning
00:14:46
i have an idea of how each of the flows
00:14:48
developed
00:14:49
or are developing and then i can make
00:14:52
design changes
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or change my analysis and continue from
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there
00:14:57
what i would do is remember to go back
00:14:59
into calculation control options
00:15:01
turn off calculation time as a finishing
00:15:05
condition
00:15:06
and then the next time i choose to run
00:15:08
this
00:15:09
it's going to continue where it left off
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and complete
00:15:13
the last hour to let's say that it has
00:15:15
to do
00:15:16
i love that about flow that you can
00:15:18
continue where you left off rather than
00:15:20
starting at the beginning all right
00:15:23
so i have all that let's take a look at
00:15:26
my results
00:15:28
with transient explorer active
00:15:31
i can create a cut plot that's what i
00:15:34
generally do
00:15:36
cut plots two-dimensional cross-sections
00:15:40
i can only plot the results that i chose
00:15:43
to save out in the transient explorer
00:15:45
you'll see that's immiscible water and
00:15:46
mass fraction only
00:15:49
and i can play that to get an idea of
00:15:53
what that fluid is doing over time
00:15:58
so it looks good i can see a bit of
00:15:59
splashing going on there
00:16:01
we want to fix a lot of that don't we
00:16:03
but i'm able to get a really good idea
00:16:05
of
00:16:06
what's happening in this tank and i can
00:16:08
look at that at any cross section that i
00:16:10
feel like
00:16:12
now that's just a nice visual thing
00:16:13
let's go compare that against
00:16:16
all four of the tanks when i look at
00:16:19
this
00:16:20
it's not getting me too much information
00:16:22
on which design is the best
00:16:24
but i can very easily see
00:16:28
the three design choices there
00:16:31
are definitely dissipating the energy or
00:16:34
the waves far faster than no baffle
00:16:37
design
00:16:38
let's come back here just looking at
00:16:39
visual results is
00:16:42
not all that we do here i'm going to go
00:16:45
ahead and take a look at numerical
00:16:47
results
00:16:48
and i'm going to show you how to do that
00:16:49
with gold plots because that is a very
00:16:51
quick way to get results over time
00:16:54
so i'm going to go to my gold plots um i
00:16:56
would choose which one i want to spit
00:16:58
out in this case it's going to be torque
00:17:00
i make the x-axis physical time i hit
00:17:03
show
00:17:04
this is just a value at 10 seconds
00:17:07
that's not what i want i want to see
00:17:08
what's happening over time
00:17:11
so this is design zero this is pitching
00:17:14
moment
00:17:15
or talk about the z-axis
00:17:18
over time i can see it gets to about 70
00:17:21
000 inch pounds
00:17:22
in the worst case and then starts
00:17:24
damping out
00:17:25
i want to compare that against all the
00:17:27
other designs
00:17:29
what you could do is export to excel
00:17:31
right from here
00:17:32
and then just choose to export all your
00:17:35
other configurations or all your other
00:17:37
exports
00:17:38
i have a faster way to spit that out
00:17:41
into excel
00:17:42
or to compare them even i'm going to go
00:17:45
to results
00:17:47
compare and i already
00:17:50
showed the results but let me go here to
00:17:52
definition
00:17:54
what you do is you pick the plot that
00:17:55
you want to compare it could be
00:17:56
numerical
00:17:57
or it could be a visual result you pick
00:18:00
which projects you want to
00:18:02
show you hit compare that pulls the
00:18:05
results from all the different studies
00:18:07
and then you get tabs that you can view
00:18:08
like this so here we are seeing
00:18:11
that the torque value for
00:18:14
design one appears to be the best so
00:18:17
very quick
00:18:19
visual outputs there to base design
00:18:21
decisions off of
00:18:23
from this choice if you wanted to do
00:18:25
more with this
00:18:26
you can of course extract this out to
00:18:28
excel as a button here
00:18:30
so right click export as you do that
00:18:33
it gets you columns of data for every
00:18:36
single data point in these charts if
00:18:37
that's what you needed
00:18:39
okay i exported the common ones out
00:18:44
plotted them and dropped them here so
00:18:46
here is force in the x direction the
00:18:48
breaking direction
00:18:50
um i can see that my no baffle design
00:18:52
you know it's
00:18:53
wobbling around but all my three baffle
00:18:56
designs are pretty even
00:18:57
we can see that hits pretty much the
00:19:00
same value and then
00:19:01
evens out the same value so i've learned
00:19:04
that it's good to have baffles but not
00:19:06
much else
00:19:07
i don't know which design is better here
00:19:09
is the plot we just looked at it is
00:19:11
torque in the z around the z-axis or
00:19:14
pitching moment
00:19:16
and like i said we have design one
00:19:18
that's the suppressor design
00:19:20
the single channel down the center that
00:19:22
seems to have the lowest torque
00:19:25
and gets down to to a low torque very
00:19:28
fast
00:19:29
interestingly that combination design
00:19:32
design three
00:19:33
that mixed the large channel in the
00:19:35
center
00:19:36
and the perforated plate holes on the
00:19:38
side um it actually damps a lot faster
00:19:40
than both of the other choices
00:19:42
i found that interesting maybe if i
00:19:45
worked on that combination a little bit
00:19:46
more
00:19:47
i could get the overall torque value low
00:19:49
and damp faster than the others
00:19:51
so i was kind of thinking back and forth
00:19:54
on that i'm leaning towards design one
00:19:56
that's suppressor design
00:19:57
so i take a look at my last plot which
00:19:59
is the average
00:20:01
turbulent energy in the entire system
00:20:03
over time a lot of my peaks are
00:20:06
pretty similar though overall i am
00:20:09
seeing
00:20:10
uh design one still reach the lower
00:20:11
values here over that 10 second frame
00:20:15
uh so i'm feeling pretty confident on
00:20:16
picking design one compared to the
00:20:18
others
00:20:19
so ultimately you know using solidworks
00:20:21
flow simulation we're able to use both
00:20:23
visual results and numerical results uh
00:20:26
to make some
00:20:27
really detailed design decisions on
00:20:29
which baffle design was best
00:20:31
thank you guys so much for attending
00:20:33
please feel free to go to our youtube
00:20:35
page and check out any of our other
00:20:36
pre-recorded webinars or reach out
00:20:38
directly to us
00:20:40
for one-on-one sessions we are so happy
00:20:42
to help you guys
00:20:43
thanks for coming
00:20:49
[Music]
00:20:59
you

Description:

https://www.goengineer.com/error/405 https://www.goengineer.com/error/405 https://www.goengineer.com/error/405 A partially filled tanker travels at speed, and then suddenly stops. The liquid inside its tank continues forward, slamming into the walls, then dissipating over time in waves. How much force does it apply on the tank? How long does it take to dissipate? Could a particular baffle design within the tank reduce the overall force, turbulence, and time to settle? Using SOLIDWORKS Flow Simulation, we can find out. If you are curious what SOLIDWORKS Flow Simulation is capable of, need a how-to for analyses that contain multiple phases of fluid, or want a use-case with iterative design and compared results, this webinar could be useful to you. https://www.goengineer.com/ http://www.facebook.com/goengineer http://www.twitter.com/goengineer https://www.linkedin.com/company/goengineer

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