Hello I want to attach the rigid body modes to the solver for AMG coarsening. I saw there’s an interface in libMesh with libMesh::NonlinearSolver (https://libmesh.github.io/doxygen/classlibMesh_1_1NonlinearSolver.html#a2f0c2db92008f6e7c011861a649ec012) but this is for NonlinearImplicitSystem. I am using a FEMSystem that contains a DiffSolver which can be a PetscDiffSolver. Is there any way to use the libMesh::NonlinearSolve capabilities from the PetscDiffSolver? Or I will have to re-implement it for PetscDiffSolver?
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