lid velocity = 0.0625, prandtl # = 1., grashof # = 1. SNES Object: 1 MPI processes type: newtonls maximum iterations=50, maximum function evaluations=10000 tolerances: relative=1e-08, absolute=1e-50, solution=1e-08 total number of linear solver iterations=2 total number of function evaluations=3 norm schedule ALWAYS Jacobian is built using colored finite differences on a DMDA SNESLineSearch Object: 1 MPI processes type: bt interpolation: cubic alpha=1.000000e-04 maxstep=1.000000e+08, minlambda=1.000000e-12 tolerances: relative=1.000000e-08, absolute=1.000000e-15, lambda=1.000000e-08 maximum iterations=40 KSP Object: 1 MPI processes type: gmres restart=30, using Classical (unmodified) Gram-Schmidt Orthogonalization with no iterative refinement happy breakdown tolerance 1e-30 maximum iterations=10000, initial guess is zero tolerances: relative=1e-05, absolute=1e-50, divergence=10000. left preconditioning using PRECONDITIONED norm type for convergence test PC Object: 1 MPI processes type: asm total subdomain blocks = 1, amount of overlap = 1 restriction/interpolation type - RESTRICT Local solver information for first block is in the following KSP and PC objects on rank 0: Use -ksp_view ::ascii_info_detail to display information for all blocks KSP Object: (sub_) 1 MPI processes type: preonly maximum iterations=10000, initial guess is zero tolerances: relative=1e-05, absolute=1e-50, divergence=10000. left preconditioning using NONE norm type for convergence test PC Object: (sub_) 1 MPI processes type: ilu out-of-place factorization 0 levels of fill tolerance for zero pivot 2.22045e-14 matrix ordering: external factor fill ratio given 0., needed 0. Factored matrix follows: Mat Object: 1 MPI processes type: seqdense rows=64, cols=64 package used to perform factorization: petsc total: nonzeros=4096, allocated nonzeros=4096 linear system matrix = precond matrix: Mat Object: (sub_) 1 MPI processes type: seqdense rows=64, cols=64 total: nonzeros=4096, allocated nonzeros=4096 total number of mallocs used during MatSetValues calls=0 linear system matrix = precond matrix: Mat Object: 1 MPI processes type: seqaij rows=64, cols=64, bs=4 total: nonzeros=1024, allocated nonzeros=1024 total number of mallocs used during MatSetValues calls=0 using I-node routines: found 16 nodes, limit used is 5 Number of SNES iterations = 2