param_file.petsc

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 -order 1                      # order of approximation
 -saturated_conductivity 0.02   
 -theta_r 0.0 
 -theta_s 0.17 
 -theta_m 0.17 
 -alpha 0.06 
 -n 2.8 
 -save_every_nth_step  4       # time-steps to save output at 
 
 
# petsc time solver (ts) arguments
 -ts_monitor                    # to print messages about the time step computations                  
 -ts_exact_final_time stepover  # rule when to stop at the final time
 -ts_dt 0.1              # time step size
 -ts_final_time 120         # final time
 -ts_adapt_type none            # no time-adaptivity, i.e., fixed step size
 
 # petsc linear solver arguments, fixed
 -ksp_type gmres 
 -pc_type lu 
 -pc_factor_mat_solver_type mumps 
 
 # petsc nonlinear solver arguments, no need to change them
 -snes_atol 1e-7
 -snes_rtol 1e-12 
 -snes_monitor 
 -snes_lag_jacobian 1