[EDZ permeabillity] Avoid stress=0 in the principle stress calculation

ufz · Jul 24, 2019 · 63a8752 · 63a8752
1 parent 39c61e2
commit 63a8752
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diff --git a/FEM/Material/Solid/StressAuxiliaryFunctions.cpp b/FEM/Material/Solid/StressAuxiliaryFunctions.cpp
@@ -15,6 +15,7 @@
 
 #include <algorithm>
 #include <cmath>
+#include <limits>
 
 namespace SolidProp
 {
@@ -57,6 +58,16 @@ double* getPrincipleStresses(double const* const s,
                      - s23 * s23 * s11 - s13 * s13 * s22
                      - s12 * s12 * s33;
 
+    if ((std::fabs(I1) < std::numeric_limits<double>::epsilon() &&
+        std::fabs(I2) < std::numeric_limits<double>::epsilon()) ||
+        std::fabs(I1 * I1 - 3.0 * I2) < std::numeric_limits<double>::epsilon()
+    )
+    {
+        for (int k=0; k<3; k++)
+            principle_stress[k] = s[k];
+        return principle_stress;
+    }
+
     const double cos_a =
         std::min(std::max(0.5 * (2 * I1 * I1 * I1 - 9. * I1 * I2 + 27.0 * I3) /
                               std::pow(I1 * I1 - 3.0 * I2, 1.5),

diff --git a/FEM/rf_mmp_new.cpp b/FEM/rf_mmp_new.cpp
@@ -964,6 +964,7 @@ std::ios::pos_type CMediumProperties::Read(std::ifstream* mmp_file)
             _damage_zone_permeability =
                 new PorousMediumProperty::DamageZonePermeability(a, b);
             in.clear();
+            ScreenMessage("DAMAGE_ZONE_PERMEABILITY is used.\n");
             continue;
         }
         //------------------------------------------------------------------------