tAdded a negative value check for the effective normal stress. - cngf-pf - continuum model for granular flows with pore-pressure dynamics (renamed from 1d_fd_simple_shear)
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       ---
 (DIR) commit 579f9c5f031889c775b764df78a0a1d86eca9217
 (DIR) parent 150398e2da07a321896e44c5ea7bf1238d683150
 (HTM) Author: Ian Madden <iamadden@stanford.edu>
       Date:   Mon,  8 Mar 2021 20:09:38 -0800
       
       Added a negative value check for the effective normal stress.
       
       Signed-off-by: Anders Damsgaard <anders@adamsgaard.dk>
       
       Diffstat:
         M simulation.c                        |       4 ++++
       
       1 file changed, 4 insertions(+), 0 deletions(-)
       ---
 (DIR) diff --git a/simulation.c b/simulation.c
       t@@ -533,6 +533,10 @@ compute_effective_stress(struct simulation *sim)
                if (sim->fluid)
                        for (i = 0; i < sim->nz; ++i)
                                sim->sigma_n_eff[i] = sim->sigma_n[i] - sim->p_f_ghost[i + 1];
       +                        if( sim->sigma_n_eff[i] < 0) { 
       +                          fprintf(stderr, "sigma_n_eff[%d] is negative with value %g", i, sim->sigma_n_eff[i]);
       +                    exit(1);
       +                  }
                else
                        for (i = 0; i < sim->nz; ++i)
                                sim->sigma_n_eff[i] = sim->sigma_n[i];