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moving walls + static walls in adjointShapeOptimizationFoam |
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July 21, 2020, 03:43 |
moving walls + static walls in adjointShapeOptimizationFoam
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New Member
Christophe
Join Date: May 2020
Posts: 7
Rep Power: 6 |
Hello,
I am doing my first adjointShapeOptimizationFoam case (and second real study with openFOAM), it does run but starts to slowly diverge after 15 to 30 iterations and completely crashes after 250 to 550 iterations (depending on the underrelaxation applied to "alpha": I tried setting it anywhere from 0.01 to 0.2). The part that shows signs of divergence is the "Adjoint continuity errors." My domain is a volute-like channel scooping fluid from a spinning pool of water (see attached pictures, that should seriously help), and the bounding box of the whole thing is roughly 1ft x 1ft x 6in. The boundaries are:
The mesh was generated with snappyHexMesh keeping all cells at level0: no refinement, no boundary layers, just some snapping to the surfaces. I am using the realizableKE turbulence model, the medium is warm water (nu=4.7e-7), the "lambda" and "alphaMax" (in transportProperties) are respectively at 1e-5 and 200. A quick look at the files saved show that porosity is added virtually everywhere (alpha varying between 15 and 180 throughout the domain at iteration#500). I built my case by modifying the adjointShapOptimizationFoam\pitzDaily tutorial, so all the schemes and most other parameters are kept as they were in the tutorial. So I have a few questions:
NB: for what it's worth, the case is run in MPI/parallel mode (24 cores) with BlueCFD Core 2017 (openFOAM v5 ported to Windows). |
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