On 6/2/21 3:07 AM, [email protected] wrote:
compile but does not run correctly with deal.II 9.2.0 . The analysis can run
until step 204 and then diverge. Would it be possible changes in
preconditioner destroy the convergence?
************************************************************************************************
Time step = 201, at t = 2.010000e-01
GMRES_ITR = 8 GMRES_RES = 4.052763e-10
************************************************************************************************
Time step = 202, at t = 2.020000e-01
GMRES_ITR = 8 GMRES_RES = 7.194398e-10
************************************************************************************************
Time step = 203, at t = 2.030000e-01
GMRES_ITR = 8 GMRES_RES = 1.361073e-09
************************************************************************************************
Time step = 204, at t = 2.040000e-01
GMRES_ITR = 8 GMRES_RES = 4.896128e-09
************************************************************************************************
Time step = 205, at t = 2.050000e-01
GMRES_ITR = 8 GMRES_RES = 3.220123e-08
************************************************************************************************
Time step = 206, at t = 2.060000e-01
GMRES_ITR = 8 GMRES_RES = 7.647033e-07
************************************************************************************************
Time step = 207, at t = 2.070000e-01
GMRES_ITR = 8 GMRES_RES = 3.355695e-04
************************************************************************************************
Time step = 208, at t = 2.080000e-01
GMRES_ITR = 8 GMRES_RES = 5.007715e+01
************************************************************************************************
Time step = 209, at t = 2.090000e-01
GMRES_ITR = 8 GMRES_RES = 1.262003e+12
************************************************************************************************
Time step = 210, at t = 2.100000e-01
GMRES_ITR = 8 GMRES_RES = 1.279221e+33
It looks like the GMRES solver converged just fine, but that the solution
diverges anyway.
Could you try to run the program with previous versions of deal.II? Did it
work correctly back then? What version is the last one that worked? We may
also want to rope in the author of the program, Jie Cheng (CC:ed), maybe he knows!
Best
W.
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Wolfgang Bangerth email: [email protected]
www: http://www.math.colostate.edu/~bangerth/
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