[Ananthakrishnan]

Hi,

I have a strange problem.

I compiled a transient solver (pimpleKinematicFoam) for particle based erosion from pmpleFoam ( http://www.tfd.chalmers.se/~hani/kur...ing_report.pdf ). It runs fine on a single processor but if i try to put it in parallel it just hangs after a few iterations. Doesn't diverge/ doesn't crash just hangs at "solving 3D cloud KinematicCloud" as shown in below figure..



I also get the duplicate entry error messages as shown below while running the solver. I dont know if this error is related to the problem or not.



Please let me know if anybody has any clue

Thank you very much

With regards,
Krishna

[C-L]

Hello,

I am currently faced with exactly the same issue, although I can't get past that 'evolving kinematic cloud' on either my own DPMFoam solver OR the unaltered one. Have you found any solution to this?

I am modelling a cyclic BC pipe and the only way I can get the code to run in parallel is to split the mesh up in the (r,theta) directions. If I split in the z direction I get this error. Have you tried decomposing the mesh in a different way?

[Ananthakrishnan]

Hi,

no. strictly speaking i couldnt solve the problem because i never really understood the problem completely.. Need to check the iterations in the for loop step by step and i dont have any means to do it at my end.
I went about it by running quite a few iterations in single processor and then decomposing the latest time.

[C-L]

Hi,

Do you think this is a bug in the solver code or are we just setting up the problem wrong? I don't really have the time to dig around in the code so I think I will just use your solution and decompose the mesh at a later time step. Thanks for the quick reply!

[Ananthakrishnan]

Now that after you have also faced the same problem in a different situation, i am inclined to think the problem lies with parallel handling of new particles being created.

[C-L]

Well I have just tried to run the solver on serial before decomposing and I am faced with the same problem .. I have even taken out the 'particle injection' from the constant/kinematicCloudProperties but it still stops at 'evolving kinematic cloud'

I have just double checked your log file and it turns out my code is freezing before solving any fluid equations where as yours manages a couple of time steps first?

[Ananthakrishnan]

yes. mine went on for a couple of iterations before freezing.

So you are saying that even though its adding 0 parcels its not proceeding!!!
I really thought the problem was with the kinematic cloud!!!!

I have no idea whats happening..May be you can keep bringing down the complexity of the case to a point where it runs perfectly and then add on the requirements.

[harsha_kulkarni]

Originally Posted by Ananthakrishnan

Hi,

I have a strange problem.

I compiled a transient solver (pimpleKinematicFoam) for particle based erosion from pmpleFoam ( http://www.tfd.chalmers.se/~hani/kur...ing_report.pdf ). It runs fine on a single processor but if i try to put it in parallel it just hangs after a few iterations. Doesn't diverge/ doesn't crash just hangs at "solving 3D cloud KinematicCloud" as shown in below figure..



I also get the duplicate entry error messages as shown below while running the solver. I dont know if this error is related to the problem or not.




Please let me know if anybody has any clue

Thank you very much

With regards,
Krishna

Have you tried the case given in the Document. The solver works for their geometry and
predict erosion rate.

But when I tried the solve it does not solve for erosion rate.