lid velocity = 0.00591716, prandtl # = 1., grashof # = 1. 0 KSP Residual norm 0.070841 1 KSP Residual norm < 1.e-11 Linear solve converged due to CONVERGED_RTOL iterations 1 KSP Object: 1 MPI process type: cgne maximum iterations=10000, initial guess is zero tolerances: relative=1e-05, absolute=1e-50, divergence=10000. left preconditioning using UNPRECONDITIONED norm type for convergence test PC Object: 1 MPI process type: lu out-of-place factorization tolerance for zero pivot 2.22045e-14 matrix ordering: nd factor fill ratio given 5., needed 3.46154 Factored matrix: Mat Object: 1 MPI process type: seqaij rows=676, cols=676, bs=4 package used to perform factorization: petsc total: nonzeros=43920, allocated nonzeros=43920 using I-node routines: found 169 nodes, limit used is 5 linear system matrix, which is also used to construct the preconditioner: Mat Object: 1 MPI process type: seqaij rows=676, cols=676, bs=4 total: nonzeros=12688, allocated nonzeros=12688 total number of mallocs used during MatSetValues calls=0 using I-node routines: found 169 nodes, limit used is 5 0 KSP Residual norm 1.46462e-05 1 KSP Residual norm < 1.e-11 Linear solve converged due to CONVERGED_RTOL iterations 1 KSP Object: 1 MPI process type: cgne maximum iterations=10000, initial guess is zero tolerances: relative=1e-05, absolute=1e-50, divergence=10000. left preconditioning using UNPRECONDITIONED norm type for convergence test PC Object: 1 MPI process type: lu out-of-place factorization tolerance for zero pivot 2.22045e-14 matrix ordering: nd factor fill ratio given 5., needed 3.46154 Factored matrix: Mat Object: 1 MPI process type: seqaij rows=676, cols=676, bs=4 package used to perform factorization: petsc total: nonzeros=43920, allocated nonzeros=43920 using I-node routines: found 169 nodes, limit used is 5 linear system matrix, which is also used to construct the preconditioner: Mat Object: 1 MPI process type: seqaij rows=676, cols=676, bs=4 total: nonzeros=12688, allocated nonzeros=12688 total number of mallocs used during MatSetValues calls=0 using I-node routines: found 169 nodes, limit used is 5 Number of SNES iterations = 2