On 1/24/21 5:25 PM, Animesh Rastogi IIT Gandhinagar wrote:
Thank you for your reply. I was able to setup the slepc eigenvalue solver. The
issue is that it is taking a lot of time to calculate the smallest eigenvalue
for just 10000 degrees of freedom. Largest eigenvalue is calculated pretty
fast. I tried many solvers in slepc - Krylov Schur, JD, Arnoldi iteration,
Lanczos etc. However, I am facing the same issue. Also, the KrylovSchur solver
is giving me following error after taking a lot of time - /The number of
converged eigenvectors is 0 but 1 were requested. /Could you please help me
with this. I also tried to do shift-invert operation (wondering if that would
help) and got the following error
Animesh,
I don't know the eigenvalue solvers well enough to help. But step-36 solves
for the smallest eigenvalues. You might want to compare what you have against
step-36 and understand why that program works and yours doesn't.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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