How to set target value in eigensolver?

[rainiscold]

Is there an interface in Moose to set the target value in eigen solver?
I know it is possible in SLEPc, I couldn't figure out how to set it in Moose.

[GiudGiud]

Hello

Do you mean setting a target value then adjusting parameters to make the solution be this target value?
Or do you mean selecting an eigenmode by selecting a known eigenvalue?

[maxnezdyur]

I would look at this example modules/solid_mechanics/test/tests/modal_analysis/modal.i.
We can pass any petsc/slepc options using the interface

petsc_options_iname = '-st_type -eps_target -st_pc_type -st_pc_factor_mat_solver_type'
petsc_options_value = 'sinvert 0 lu mumps'

[rainiscold]

Thank you for the info. I didn't realize the solution is right there.