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August 7, 2020, 17:13 |
Instability in buoyantSimpleFoam
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New Member
Adrian
Join Date: Aug 2020
Posts: 1
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Good Day Foamers
I am a little new to OpenFOAM and having bit of trouble with a project I am currently busy with. I am trying to simulate the flow around a greenhouse. buoyantSimpleFoam runs for 1 or 2 iterations when using snappyHexMesh and for about 8 or 9 iterations when using just blockMesh before I usually encounter a negative temperature and buoyantSimpleFoam stops. Apart from using buoyantSimpleFoam the equation of state is Boussinesq and kEpsilon is being used for turbulence. I have simplified the problem into a 2D on since I did not think 3D was necessary in this case. I have tried to check a few stability criterion and made the velocity smaller, time step smaller and mesh size larger specifically to satisfy Courant stability criterion which did help a small bit. The simulation is still unstable. I have also tried only using blockMesh without using surfaceFeatureExtract and snappyHexMesh before using buoyantSimpleFoam and it still was unstable. I have tried to use some different discretization schemes without much success. I have increased some of the relaxation factors. I believe that something in my zero folder may be causing the instability but I am learning new things every day about OpenFOAM so it may be very possible that it is something else entirely that is causing the issues I am experiencing. When using ParaView I see that the pressure switches from high to low and back again every time step which makes me think there is an issue specifically in the p or p_rgh file in the 0 folder. p_rgh: Quote:
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https://drive.google.com/drive/folde...0z?usp=sharing Sorry for the large post. I would truly be incredibly grateful to any help I can get on this issue |
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Tags |
boussinesq, buoyantsimplefoam, negative initial temp, openfoam 7, unstable |
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