On 10/3/24 01:01, 'yy.wayne' via deal.II User Group wrote:
I hope to precondition a system similar to step-23, with implicit time
discretization (backward euler or Crank Nicolson). For example, the matrix has
the form of M+dt^2K, where M is the mass matrix and K is the stiffness matrix.
I'm preconditioning it with Jacobi preconditioner, which is very efficient
because the system is dominated by M and applies to matrix-free framework.
However, when I increase the number of freedomes, iterations increase with
just Jacobi preconditioner. Is there another recommended preconditioner or
modification to simple jacobi preconditioners? I cannot find one since jacobi
preconditioner is quite efficient for this problem, the lack of independency
to h is its only drawback.
Have you tried something like SSOR?
Best
WB
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Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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