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FSI on thin part

Junta_20361

Hi expert,

I'm doing an DC - FSI for a traffic sign like below.

I know how to setup for DC FSI on 3D model.
But the sign in my model is very thin (1mm), so in OS, we usually use middle surface mesh (with Thickness) for it.
Is it possible to run the DC FSI on middle surface mesh?

Thank you!

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AcuSolve

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OptiStruct

v2021.0

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Rogerio Nakano_21179

Please refer to this documentation for OptiStruct and AcuSolve FSI:

https://2021.help.altair.com/2021/hwsolvers/os/topics/solvers/os/analysis_fluid_structure_interaction_r.htm?zoom_highlightsub=fsi

https://2021.help.altair.com/2021/hwsolvers/os/topics/solvers/os/analysis_fluid_structure_interaction_workflow_r.htm#analysis_fluid_structure_interaction_workflow_r

I hope this is helpful

Regards

Junta_20361

Hi

Please refer to this documentation for OptiStruct and AcuSolve FSI:

https://2021.help.altair.com/2021/hwsolvers/os/topics/solvers/os/analysis_fluid_structure_interaction_r.htm?zoom_highlightsub=fsi

https://2021.help.altair.com/2021/hwsolvers/os/topics/solvers/os/analysis_fluid_structure_interaction_workflow_r.htm#analysis_fluid_structure_interaction_workflow_r

I hope this is helpful

Regards

hi Rogerio,

Thank you for your input.

It is very helpful!

acupro

On the AcuSolve side, you need to have two separate surface sets - one for the front side of the sign and another for the back side - made of different nodes. You need this in order to have different pressure values on the front and back. For AcuSolve you can initially model this with a single surface, then split the nodes/surfaces in order to obtain the two distinct surfaces.

I'm not sure how one would accomplish the similar process on the OptiStruct side, in order to make sure the communication surfaces match the front and back surfaces on the AcuSolve side.

It might be simpler to model this with solid/3D elements in OptiStruct, with the associated solid thickness being capture on the AcuSolve side as well.

Junta_20361

On the AcuSolve side, you need to have two separate surface sets - one for the front side of the sign and another for the back side - made of different nodes. You need this in order to have different pressure values on the front and back. For AcuSolve you can initially model this with a single surface, then split the nodes/surfaces in order to obtain the two distinct surfaces.

I'm not sure how one would accomplish the similar process on the OptiStruct side, in order to make sure the communication surfaces match the front and back surfaces on the AcuSolve side.

It might be simpler to model this with solid/3D elements in OptiStruct, with the associated solid thickness being capture on the AcuSolve side as well.

hi acupro,

thanks for your response.

i understand that acusolve need 2 seperate side for the front & back of the sign so i made a fully 3D model for acusolve.

then i build an OS model with the midmesh for the sign. the FSI surf is pointed to both sides of the same midmesh.

until now, the simulation can be done.

The attachment is the animation result.

Animation.gif

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