non-physical Results with multiphaseEulerFoam
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Hello everyone,
i have some trouble to run a simulation with 3 phases (Water Oil Air) 2 Inlets (Water Oil) and one outlet (plus large atmosphere) using multiphaseEulerFoam. I build a 2D box with 2 small inlets next to large atmospheres (top) and one outlet at the bottom of the box. Also I use a finer Mesh in inlet regions (see pictures "setup" and "Mesh"). I do not understand where the physics goes wrong with my boundary conditions (see screenshot at 1 sec). at a certain point my velocities change drastically and the time steps decline. Maybe the mistake is related to the phi.xx-therms in U.xx. Or with the outlet BC. Or it is something completely different. Hopefully you can help me to find the mistake and/ or fix the BCs. I am grateful for your suggestions and tips! I have a Groovy BC for U.Oil which looks like this: Quote:
Alpha.Oil respectively: Quote:
p and p.rgh look like this: Quote:
I will attach the whole case. You find "Constant" in the next comment. This is an excerpt of the log file after the simulation "crashed" Code:
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Hello everyone,
here is the rest of the case. I divided "Constant" into properties and blockMesh. Kind regards, Stefanie |
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Update:
I went back to the BubbleColumn tutorial and compared BCs. Also I changed the atmosphere in p_rgh. Now Oil has the aimed behavior, but water outflow is blocked. U.air Code:
FoamFile Code:
FoamFile Code:
FoamFile Code:
FoamFile Code:
FoamFile Do you need any other images or information? Thank you for your help! Stefanie |
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Update 2:
I transferred the pressure BCs from a twoPhseEulerFoam Case provided by Tonnykz (https://www.cfd-online.com/Forums/op...tml#post730375) to my case and carefully applied different phis to inlets and outlets. It seems like I fixed the BCs, since the pressure distribution makes more sense now. Also it seems like I have a freestream outlet and unaffected inlets (Pictures attached, after 44 sek). Attached you find the 0-Directory if you are interested in the exact BC-set up. |
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