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# FLIP / FEM - Mutual Interaction

Sup guys,

I'm trying to make a Fluid pushing a FEM sphere. I've found some information about fluid force + some setting on the flip solver but the FEM object just don't move.
I'm clearly doing something wrong. Can anyone help understand what's going on?

Thank's,
Alvaro

FLIP FEM.rar

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I thought I saw a thread that this was not implemented yet. (I could be wrong).

You could fake the force of the fluid on the FEM, write that out as BGEO sequence then bring it back in as an obstacle for the FLIP.

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Alright. I've seen this topic here but what he says doesn't work - at least on my scene.

The fake idea might work just fine.

Thx Atom.

/Alvaro

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I didnt take a look at the file. Under your flip solver you should see 1 setting called feedback scale, make that 1 and simulate.

Edited by derjcmp

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Thx derjcmp, i've tried it already with no success.

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Why not grab the velocity grid from FLIP and transfer over the velocity to the FEM points?

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wow Stephen, that would be amazing! Unfortunatelly I don't even know how start it.

Can anyone point me a direction on how to achieve this? I totally understand the logic but not the proccess.

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Here is a quickie.

You will probably want to introduce some sort of drag or multiplication to the incoming FLIP points so it doesn't feel like it weighs nothing.

flip_push_fem.hip

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Awesome, Steven! Look's quite simple, i'll give it a try right now. Thank you very much!

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perfect, it works just fine!

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look forward to seeing what this does

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On 10/6/2016 at 4:40 AM, Atom said:

I thought I saw a thread that this was not implemented yet. (I could be wrong).

You could fake the force of the fluid on the FEM, write that out as BGEO sequence then bring it back in as an obstacle for the FLIP.

I was trying a similar effect the other day, and went the fake route: https://vimeo.com/186079143

Right now FEM only has mutual interaction with other FEM objects, I thought I read somewhere that this is being worked on though.
Stephen's trick works a treat thanks for sharing!

Edited by Tex

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Wow, pretty cool stuff, John!

/Alvaro

Thanks dude!