ERCOFTAC Centrifugal Pump with kOmegaSST Model
I recently got the ERCOFTAC Centrifugal Pump Validation Test Case to run in OF 2.1.0. Originally this Case uses MRFSimpleFoam and the kEpsilon Turbulence Model. More Info on the Case here.
Now I want to run the same Case using the kOmegaSST Model. Unfortunately I did not yet succeed. The Computation always crashes pretty quickly after about 4 or 5 Iterations.
With the Help of http://turbmodels.larc.nasa.gov/sst.html I assembled the following Boundary Conditions:
(though I'm not really sure if they're correct)
k: fixedValue 0.48735 ... , with and )
nut: calculated 0
omega: fixedValue 4873.5 ... with and
U: surfaceNormalFixedValue -11.4 m/s
nut: calculated 0
p: fixedValue 0
ROTOR and STATOR:
k: kqRWallFunction 0 ... at Wall (right?)
nut: nutkWallFunction 0
omega: omegaWallFunction 12500 ... with .
(I'm not really sure what is supposed to be. But since I've seen pretty small values being used for it, I assumed it to be the width of the celllayer next to the wall, which would be around in my case. Please correct me if I'm wrong!!!)
U: fixedValue 0
I already tried playing around with the Relaxation Factors, BCs, etc. No Success yet, any ideas?
Any Help would be appreciated!
Well, I guess that was a lesson I won't forget so soon...
if you look closely at my fvSolutions you see that I have an extra closed curly bracket after the SIMPLE-dictionary. This caused OpenFOAM to ignore the Relaxation Factors completely! OF can be a real bitch sometimes!
I hope this thread can help someone and prevent him from going crazy about why his simulations won't work. ^^
in your previous post, you wrote that you are using OpenFOAM 2.1.0., and you wanted to run ERCOFTAC centrifugal pump test case. I would like to ask you whether you managed to run it with this version of O.F.. Since i know (if i am not wrong), the ERCOFTAC centrifugal pump test case requires GGI algorithm, and only O.F. extended version has this algorithm. I am new in using O.F., and i am also trying to run ERCOFTAC test case, but until now, i am unable to do it, because i don't have the extended version of O.F. so if you managed to run it in any case, can you please let me know how you did it?
thank you very much
openfoam 2.1.x has the AMI interface implemented which does pretty much the same as the GGI interface. so no need for a dev- or ext-version. look at the mixervesselAMI2D pimpleDyMFoam-tutorial or here for details.
here are my settings for the steady-state case:
PolyMesh / Boundary File
Centrifugal pump with MRFSimpleFoam
I´m new using OpenFOAM and I´m really looking forward to study a case of a centrifugal pump solved with MRFSimpleFoam.
Does anybody have a case already done where I can learn how to run the simulation?
Thank you very much.
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