[petsc-users] Accessing the adjoint in TSSetRHSJacobianP

[Salazar De Troya, Miguel]

Hi,

The jacobian of the RHS w.r.t. the parameter P is a matrix that will be multiplied by the adjoint solution within TSAdjoint(). I am interested in having access to that adjoint so I can calculate shape derivatives with firedrake_adjoint. I will have to use that adjoint function, apply it to the residual and calculate the shape derivative from the resulting 0-form to obtain my RHSJacobianP*adjoint. This is the workaround done in pyadjoint: https://github.com/dolfin-adjoint/pyadjoint/blob/e6fbd13f8ac63290804852fa2f27307c44bdc9e3/dolfin_adjoint_common/blocks/solving.py#L204 Is there another alternative within PETSc? Maybe using a matrix free approach?

Thanks
Miguel

Miguel A. Salazar de Troya
Postdoctoral Researcher, Lawrence Livermore National Laboratory
B141
Rm: 1085-5
Ph: 1(925) 422-6411
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