How to set up a cfd analysis with no inflow/outflow in hypermesh

Hello, I'm new here so greetings to all of you.

I need to simulate the behavior of a cylinder-shaped fluid mass contained between two plates ,within a hollow cylinder (like illustrated in the figure attached). In particular, I need output data about the pressure field within the fluid due to the application of a huge force/pressure on one plate so that the whole system accelerates within the hollow cylinder at tens of thousands of g's. The other plate reacts to the motion only with its inertia, so that after a transient phase there is a steady state condition in which the distance between the two plates is fixed, for given initial data.

I actually don't know if it is feasible with any software of the Altair suite, and I would appreciate an hint on how to proceed.

I am trying to set this up with acusolve but I am having some troubles because of the absence of an inflow/outflow. Usually the examples that I found have that kind of configuration.

I'm sorry if I have posted to the wrong section.

Thank you in advance!

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ydigit

I guess RADIOSS is in a better position to solve this type of problem.

Altair Forum User

Can I ask you why? I thought it was better with acusolve because it concerns the behavior of a compressible fluid and CFD maybe could handle it better.

EDIT: I'm trying to solve the problem meshing the gas with SPH. I hope it's the right path to follow.

Altair Forum User

All right I have some questions about SPH:

- how do I set contacts between the gas (SPH - I used MLAW6 ) and the plates (I used M1_ELAST)? At the moment I used a contact type 7 but I don't know If it's correct;

-when I launch the model it yields the following error:

ERROR ID : 42
** ERROR IN PROPERTY/MATERIAL COMPATIBILITY
DESCRIPTION :
-- PART ID:2 HAS AN INCOMPATIBLE ASSOCIATION
.. 3D TRIANGULAR SHELL ELEMENTS
.. SPH PARTICLES DEFINITION
.. SUBSETS

I don't have 3d triangular shell elements and the number of errors is the same as the number of SPH particles so it concerns the gas.

I'm attaching the Hypermesh hm file so that you can check if you want.

Thanks for helping.

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ydigit

Can I ask you why? I thought it was better with acusolve because it concerns the behavior of a compressible fluid and CFD maybe could handle it better.

EDIT: I'm trying to solve the problem meshing the gas with SPH. I hope it's the right path to follow.

Acusolve is a weakly compressible Solver and hence this phenomenon that requires a compressible Solver will probably be not a good use for AcuSolve

ydigit

All right I have some questions about SPH:

- how do I set contacts between the gas (SPH - I used MLAW6 ) and the plates (I used M1_ELAST)? At the moment I used a contact type 7 but I don't know If it's correct;

-when I launch the model it yields the following error:

ERROR ID : 42
** ERROR IN PROPERTY/MATERIAL COMPATIBILITY
DESCRIPTION :
-- PART ID:2 HAS AN INCOMPATIBLE ASSOCIATION
.. 3D TRIANGULAR SHELL ELEMENTS
.. SPH PARTICLES DEFINITION
.. SUBSETS

I don't have 3d triangular shell elements and the number of errors is the same as the number of SPH particles so it concerns the gas.

I'm attaching the Hypermesh hm file so that you can check if you want.

Thanks for helping.

Radioss forum might be better to check with the experts on this SPH topic. Sorry don't know much about it to help.

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Altair Forum User

ok thanks for your help! I'll try in the RADIOSS section.