How do I set relaxation parameter to custom Newton solver?

General
1

I want to chage the value of relaxation parameter in custom newton solver with dirichlet bc (equivalent to dolfinx.nls.petsc.NewtonSolver.relaxation_parameter)
Is this possible?

2

Simply set a relaxation parameter in the update:

    # Update u_{i+1} = u_i + delta u_i
    uh.x.array[:] += du.x.array
    i += 1

i.e.

    # Update u_{i+1} = u_i + alpha*delta u_i
    uh.x.array[:] += alpha*du.x.array
    i += 1
1 Like
3

Thank you for your reply.
I got it.