SLEPcWrapper eigenvalue solver

[Léonhard YU]

Hello my friends, I am dealing with solid system eigenvalue problem, and I follow step-36 to construct the code. But how can I apply boundary values? I need to give a constraint boundary to system but step-36 is not clear about that.

Waiting and Thanks to your help.

[Wolfgang Bangerth]

On 2/22/22 20:01, Léonhard YU wrote:
> Hello my friends, I am dealing with solid system eigenvalue problem, and I
> follow step-36 to construct the code. But how can I apply boundary values? I
> need to give a constraint boundary to system but step-36 is not clear about that.

step-36 uses zero Dirichlet constraints, see the make_grid_and_dofs()
function. What kinds of constraints do you want?

Best
W.

--
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Wolfgang Bangerth email: bang...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/

[Léonhard YU]

Thank you professor, I have solved the problem with boundary_id as another variable in the function  make_zero_boundary_constraints()