CFD Online Discussion Forums - adjointOptimisationFoam not converging

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

    }

}

Thanks in advance,
Elvis