beginner in adaptive mesh refinement
Hi to everyone!
I am Aki, a beginner in OpenFOAM.
I am intrested in adaptive mesh refinement and I managed to find
"dynamicMeshDict" dictionary, but I am not sure how it works...
Would you tell me a condition of the refinement? The mesh is refined
automatically when the velocity (or the Courant number) exceeds a given value?
And, I am not sure coefficients in the dictionary...
I have performed some tutorials, so I guess "maxRefinement" means the max
refinement number. But I cound only understand it. I can not understand
what "refineInterval" and "maxCells" mean. And what are "lowerRefineLevel"
I would be grateful if you could provide me the meanings of them.
Thanks in advance!
As far as I understand:
refineInterval - specifies how often (every n:th timestep) the grid should be refined.
maxCells - limits the number of cells, should never be greater than the given number, an approximate number.
lowerRefineLevel - grid gets refined if "alpha1" is lower than this value.
upperRefineLevel - grid gets refined if "alpha1" is bigger than this value.
Thank you very much for your help!
I have performed some tutorials by changing them.
May I ask one more question???
What is "correctFluxes" ? These values are corrected each time step?
I looked into the code and find following:
nBufferLayer: Number of layers between different refinement levels
I understand it in that way: nBufferLayer 1 means:
a cell, which was refined once, can only be a neighbour of a cell which is not refined or refined twice. But this cell canīt be a neighbour of a cell which is refined three times.
In a tutorial I found the definitoin for maxRefinement:
maxRefinement means the number of refinements that are allowed for one cell.
But does everybody know what "unrefineLevel" mean?
Thanks a lot
has nobody an idea what it could mean?
I would be really happy to get some help
I have another question concerning the settings in the dynamicMeshDict-file. I would like to refine a tip vortex dynamically, so with the pimpleDyMFoam-solver.
As entry 'field' in dynamicMeshDict I would like to use something like Lambda2.
How can I tell the solver to calc this field?
Finally, I programmed a new solver based on pimpleDyMFoam. There, I calculated the nedded scalar field (like Lambda2). In constant/dynamicMeshDict I specify the variables that prescribe the refinement and so it works :)
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