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January 16, 2024, 08:34 |
adjointOptimisationFoam not converging
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Elvis
Join Date: Jan 2024
Posts: 1
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Hello everyone,
I use adjointOptimisationFoam to shape-optimize a geometry consisting of several cubes. The solver was slightly modified, the apparent porosity in the Navier-Stokes equation was removed. Compiling works and simulating other geometries also worked. My problem is that the adjoint system of equations does not converge and always diverges after a few 1000 iterations (due to large continuity error). The primal system converges. I have attached pictures of the primal and adjoint residuals. I tried the following: - Refine mesh - Vary relaxation factors - Increase cylinder diameter I will also try do increase the cylinder length before and after the geometry. Do you have any ideas what else I can try? This is my fvSolution: Code:
solvers { "(p|pa)" { solver GAMG; tolerance 1e-08; relTol 0.001; // was 0.01 smoother GaussSeidel; } "(U|Ua)" { solver smoothSolver; smoother GaussSeidel; nSweeps 2; tolerance 1e-08; relTol 0.01; // was 0.1 } } SIMPLE { nCorrectors 3; nNonOrthogonalCorrectors 0; momentumPredictor yes; } relaxationFactors { fields { p 0.1; // was 0.3 pa 0.1; // was 0.2 alpha 0.1; // was 0.1 } equations { U 0.1; // was 0.7 Ua 0.1; // was 0.3 } } Elvis |
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adjointoptimisationfoam, convergence, shape optimization |
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