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Are you sure your problem is stable? Also have you tried adding
mass?<br>
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<div class="moz-cite-prefix">On 1/3/18 10:12 PM, Avtar Singh wrote:<br>
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cite="mid:CAMCOCb6+xFmoMCtqmbV21m1M9m_C2E3cGTweh7xZ4_79xNtN=g@mail.gmail.com">
<div dir="ltr">Hello Petsc Users,
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<div>I am solving a fortran framework to simulate phase-field
fracture problem. Upto the failure point the code is working
fine. But as the crack-phase starts to propagate, there is
abrupt changes in the Stiffness Matrix, so determinant
becomes nearly equal to zero. Hence, the code crashes.</div>
<div> </div>
<div>I tried with mumps package with pc lu. Also tried,
superlu, gmres and fgmres with jacobi, bjacobi, lu. But the
problem still persist.</div>
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<div>Can anyone suggest, Which solver and preconditioner
should i use?<br>
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<div>Thank you</div>
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-- <br>
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<div>Avtar Singh</div>
<div>Research Scholar </div>
<div>Multiscale Mechanics and Multiphysics Lab</div>
<div>IIT Roorkee, Roorkee</div>
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