Hi, If you are using petsc, I'd suggest running with -snes_converged_reason. It looks to me that your problem is diverging for some reason. The reasons could be that the line-search or the solver is failing , which can also be changed with command line options.
Subramanya Sadasiva "But memory eventually fades. Turbulences damp out, internal strains yield to plastic flow, concentration inhomogeneities diffuse to uniformity. Systems tend to subside to very simple states,independent of their specific history." Herbert Callen . Thermodynamics and an Introduction to Thermostatics. ----- Original Message ----- From: "Lorenzo Zanon" <[email protected]> To: [email protected] Sent: Wednesday, March 6, 2013 6:53:02 AM Subject: [Libmesh-users] Newton iteration Hello, I'm modifying miscellaneous_ex3.C (2D Laplace-Young Problem Using Nonlinear Solvers, in my current libmesh version). After adapting residual and jacobian to my own problem, although the tolerance is not met, the Newton solver stops after one iteration with an all-zero (incorrect) solution: NL step 0, |residual|_2 = 1.598435e+00 Laplace-Young system solved at nonlinear iteration 0 , final nonlinear residual norm: 1.598435e+00 What could be the reason for that? Thanks a lot, Lorenzo ------------------------------------------------------------------------------ Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the endpoint security space. For insight on selecting the right partner to tackle endpoint security challenges, access the full report. http://p.sf.net/sfu/symantec-dev2dev _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users ------------------------------------------------------------------------------ Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the endpoint security space. For insight on selecting the right partner to tackle endpoint security challenges, access the full report. http://p.sf.net/sfu/symantec-dev2dev _______________________________________________ Libmesh-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/libmesh-users
