[coolcrasher]

Hi friends,

I have to work on simulating Centrifugal Pump in Openfoam. I am currently using OpenFoam version 2.3.0. I have looked out on how to start working on it.
I have seen that there is a group named Sig Turbomachinery ( http://openfoamwiki.net/index.php/Sig_Turbomachinery ) are working currently on it. I have read some papers on them however I am confused of few things before I start up with.

1) Solver named simpleTurboMFRFoam for steady 2d and 3d simulations was used but I could not find them in my current openfoam version. Was it renamed to something else ?
2) Solver named turbDyMFoam, transientSimpleDymFoam for unsteady 2d and 3d simulations was used but I could not find them in my current openfoam version. Was it renamed to something else ?
3) GGI was used to couple the meshes of stator and rotor in steady state simulation, for unsteady simulation to couple the diffuser and impeller meshes. But in openfoam 2.3 we have a tutorial in pimpleDymFoam named mixervesselAMI2D in which they use AMI to couple the meshes. Is both GGI and AMI similar ? or both are different approches.

Please guide me out of this confusion.

Thank you in advance

[student666]

Hi,

I think that those solvers you're talking about are not on the OF version you're using (foam foundation releases), you have to use FOAM extended version for them or version 1.6 (maybe).

Not sure, and I don't know the theory behind, but I think AMI and GGI are similar, but you have to look for informations, google it or look for specific papers.

Bye

[coolcrasher]

Hi MC,

Thanks a lot for your reply. However I have got reply to my questions. I would like to share with all.

Answers below

For question 1:
That was never in any release. It was an in-house development. However, the MRFSimpleFoam solver is basically the same.

For question 2:
turbDyMFoam used the PISO algorithm. Can be unstable, especially for skew meshes.
transientSimpleDyMFoam was a solver based on the PISO algorithm, but with an additional outer corrector loop. This proved more stable than the regular PISO algorithm.
The recommended solver today, from my point of view, is pimpleDyMFoam, which is basically the same as transientSimpleFoam. Just make sure to have the same settings for the Final iteration for all variables, or the convergence will be disturbed

For question 3:
Those are doing similar things. GGI is available in FOAM-extend, while AMI is in OpenFOAM. Slightly different implementations, and they have slightly different features. For a 360 degree rotor-stator-coupling, they should be very similar.

[student666]

For question 3:
Those are doing similar things. GGI is available in FOAM-extend, while AMI is in OpenFOAM. Slightly different implementations, and they have slightly different features. For a 360 degree rotor-stator-coupling, they should be very similar.

Can you give more details about?

Thanks.

[coolcrasher]

Hi ,

Am extremely sorry, I do not have any idea about AMI since I have not used it till now. Even i am figuring out a way to use it OpenFoam. I am not working on GGI so no idea about it.

Also can you be specific with your question, if I figure out something I can reply in future.

Best Regards

[student666]

I was meaning if you had any explanation, or if you were able to provide some paper about these differences.

Regards

[coolcrasher]

Unfortunately, I do not have any proofs in document ( i mean book or papers or in blog ) . But it was said by thesis supervisor and also by someone from Sig Turbomachinery group to whom I have mailed and got the reply from them.

I thought of sharing with you all which may help who are new to openfoam community and are confused about Openfoam official , Openfoam extend versions

[student666]

Thank you very much, any information will be of help.

Regards