#Fluids help

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hexed folio
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So I am following a bunch of youtube videos to see how to implement a eulerian fluid simluation. I stumbled across this fluid simulation and they talk about modifying velocity values with response to gravity acting on the fluid. However, in the demo, i am not sure how they are using gravity. Can someone help me with it?

YT vid time:
https://www.youtube.com/watch?v=iKAVRgIrUOU&t=551s

Simulation wehre it is simulating the wind tunnel
https://matthias-research.github.io/pages/tenMinutePhysics/17-fluidSim.html

merry gateBOT
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<@&987246746478460948> please have a look, thanks.

merry gateBOT
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@hexed folio

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hexed folio
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Anyone?

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Well i'm pretty sure they aren't using gravity there

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but

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Now I want to consider when making a fluid simulation, what a possible UML diagram may look like

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what are the different classes I can make?

blissful vessel
hexed folio
blissful vessel
hexed folio