[monnda]

Hello everyone!

I have been trying to implement cavitatingFoam on solids4Foam but I'm facing a problem. I know no compressible solvers are implemented so I don't know how I could do it.

Corresponding source codes are attached and if somebody can help me it would be very helpful.

[bigphil]

Hi!

What exactly is the problem?

The procedure to create a new fluid/solid model is to find a similar one, then copy it and rename it and check it compiles. Then change the code bit-by-bit and recompile as you go.

Philip

[monnda]

My code attached can be compiled without any errors but the problem is the solution I got from the new solver seems wrong. Unfortunately I can't show you the result because it is a confidential research but It is clearly different from the incompressible one. (At least the tendency should be similar.)

I checked my code again and again but I could not find what causing the problem. My guess was my code itself is not correct. My code is mostly identical with the one from foam-extend-4.0 though. I think since it is cavitatingFoam is not for dynamic mesh, it might needs something to change to implement on solids4Foam.

[Daniel_Khazaei]

Originally Posted by monnda

My code attached can be compiled without any errors but the problem is the solution I got from the new solver seems wrong. Unfortunately I can't show you the result because it is a confidential research but It is clearly different from the incompressible one. (At least the tendency should be similar.)

I checked my code again and again but I could not find what causing the problem. My guess was my code itself is not correct. Since it is cavitatingFoam is not for dynamic mesh, it might needs something to change to implement on solids4Foam.

Hi,

I have implemented cavitatingFluid for the old fsi toolkit a few month ago as someone else requested:

Compilation Issues with CavitatingFluid FSI Code

It should be easy to make it compatible with solids4Foam code structure.

Note: please carefully check the code line by line before running your case as I never found the time to test it.
Specially when it comes to the dynamic mesh modeling.

Regards,
D. Khazaei

[bigphil]

I suggest verifying your cavitatingFluid solids4Foam implementation against the cavitatingFoam solver on e.g. the cavitatingFoam tutorial case(s). This will let you check if you ported the code correctly.

As for dynamicMesh, yes the code will need to be modified e.g. look at the difference between icoFoam and icoDyFoam.

Philip

[monnda]

Hello,

Thank you very much for sharing your solver, Daniel!
I think your solver is basically the same as mine and I still have a problem.

I checked my code as Philip suggested but I did not find anything wrong.
I cannot show you the whole picture but I attached a picture showing the problem. It's like checkerboard but I don't understand what causes this.

[bigphil]

Originally Posted by monnda

Hello,

Thank you very much for sharing your solver, Daniel!
I think your solver is basically the same as mine and I still have a problem.

I checked my code as Philip suggested but I did not find anything wrong.
I cannot show you the whole picture but I attached a picture showing the problem. It's like checkerboard but I don't understand what causes this.

Did you make the required changes for moving mesh?

[monnda]

I think I did like it's done in interFluid but still got a wrong result. Maybe it is a specific error for my case so I will test with more simple cases.

[Daniel_Khazaei]

Originally Posted by monnda

I think I did like it's done in interFluid but still got a wrong result. Maybe it is a specific error for my case so I will test with more simple cases.

Do your fluid model (running in fluid only mode) and foam-extend cavitatingFoam solver produce similar results (I mean literally) for the basic foam-extend tutorial?

If yes then we can make sure that the dynamicMesh is the problem.

[monnda]

Originally Posted by Daniel_Khazaei

Do your fluid model (running in fluid only mode) and foam-extend cavitatingFoam solver produce similar results (I mean literally) for the basic foam-extend tutorial?

If yes then we can make sure that the dynamicMesh is the problem.

I just checked with cavitatingFoam in foam-extend and also checked with pimpleFoam. And they produced pretty similar results so I can say the problem is in dynamicMesh.

[bigphil]

I suggest you try a dynamicMesh problem without FSI first e.g. you could try directly modify cavitatingFoam, so you can isolate the problem away from solids4Foam/FSI issues.

Philip

[evxta3]

Hi,

Does solids4foam-v2.0 support compressible flow solvers? Thanks!

[bigphil]

Originally Posted by evxta3

Hi,

Does solids4foam-v2.0 support compressible flow solvers? Thanks!

Currently, only the weakly-compressible sonicFoam-style fluid solver has been ported; however, the preCICE OpenFOAM adapter can be used to couple the compressible OpenFOAM solvers to solids4foam*.

*disclaimer: I have not done this but I am happy to advise!