Initialize denseParticleFoam

underEngineered · October 14, 2022, 02:42

Hey Guys,

I am struggling to setup a particle laden flow in openFoam.

Initialy I started with a steady state case and transfered to unsteady one.
(Switching from simpleFoam to pimpleFoam and using the simpleFoam results as 0)
But now I am facing two problems:

1. I cant initialize denseParticleFoam with pimpleFoam results, as the fields are not the same
2. If I try to initialize directly the unsteady case with denseParticleFoam my bounding epsilon and then my bounding k are exploding thus
crashing everything.
I tried more robust numeric schemes.
I tried starting with low initial velocities but this issue always crashes my simulation

The geometry is a pipe with 1 inlet and 2 outlets.

I have attached the BCs, fvSchemes and fvSolutions.

Thank you for you help

Best regards

epsilon.air.txt

U.air.txt

p.txt

nut.air.txt

k.air.txt

mamba_ · April 21, 2024, 21:39

Hi Marcus,

Did you find a solution to this problem?
I am encountering a problem with the error below. I hope you or anyone with the knowledge can help resolve it.

failed lookup of Uc (objectRegistry region0)
available objects of type volScalarField:
5(nu mu.air p alpha.air rho.air)

underEngineered · June 13, 2024, 07:30

Hi,

the solution for the exploding k and epsilon was a bad mesh.
When I remeshed with snappy it worked.
Second "failed lookup of Uc" tells you that veloicty of the continous phase does not exists. This problem could be because your Uc-Text files stills has U written inside as the object and not Uc.

Best regards
Marcus

October 14, 2022, 02:42	Initialize denseParticleFoam	#1
underEngineered New Member Marcus Voigt Join Date: Sep 2022 Posts: 5 Rep Power: 4	Hey Guys, I am struggling to setup a particle laden flow in openFoam. Initialy I started with a steady state case and transfered to unsteady one. (Switching from simpleFoam to pimpleFoam and using the simpleFoam results as 0) But now I am facing two problems: 1. I cant initialize denseParticleFoam with pimpleFoam results, as the fields are not the same 2. If I try to initialize directly the unsteady case with denseParticleFoam my bounding epsilon and then my bounding k are exploding thus crashing everything. I tried more robust numeric schemes. I tried starting with low initial velocities but this issue always crashes my simulation The geometry is a pipe with 1 inlet and 2 outlets. I have attached the BCs, fvSchemes and fvSolutions. Thank you for you help Best regards epsilon.air.txt U.air.txt p.txt nut.air.txt k.air.txt

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April 21, 2024, 21:39		#2
mamba_ New Member Join Date: Feb 2020 Posts: 3 Rep Power: 6	Hi Marcus, Did you find a solution to this problem? I am encountering a problem with the error below. I hope you or anyone with the knowledge can help resolve it. failed lookup of Uc (objectRegistry region0) available objects of type volScalarField: 5(nu mu.air p alpha.air rho.air)

June 13, 2024, 07:30		#3
underEngineered New Member Marcus Voigt Join Date: Sep 2022 Posts: 5 Rep Power: 4	Hi, the solution for the exploding k and epsilon was a bad mesh. When I remeshed with snappy it worked. Second "failed lookup of Uc" tells you that veloicty of the continous phase does not exists. This problem could be because your Uc-Text files stills has U written inside as the object and not Uc. Best regards Marcus