[Cleanup]

dune/tectonic/frictionpotential.hh

@@ -26,27 +26,25 @@ class FrictionPotentialWrapper {
   void virtual updateLogState(double) = 0;
 };
 
-// phi(V) = V log(V/V_m) - V + V_m  if V >= V_m
-//        = 0                       otherwise
+// V log(V/V_m) - V + V_m  if V >= V_m
+// 0                       otherwise
 class FrictionPotential : public FrictionPotentialWrapper {
 public:
   FrictionPotential(double coefficient, FrictionData const &fd)
       : fd(fd), weightTimesNormalStress(coefficient * (-fd.normalStress)) {}
 
-  // log(V/V_m)  if V >= V_0
-  // 0           otherwise
+  // log(V/V_m) if V >= V_0
+  // 0          otherwise
   double differential(double V) const {
     assert(V >= 0.0);
-    if (V <= V_cutoff) {
+    if (V <= V_cutoff)
       return fd.mumin;
-    }
 
     return weightTimesNormalStress * fd.a * (std::log(V) - logV_m);
   }
 
-  // 1/V        if V >  V_0
-  // undefined  if V == V_0
-  // 0          if V <  V_0
+  // 1/V if V > V_0
+  // 0   if V < V_0
   double second_deriv(double V) const {
     assert(V >= 0);
     if (V <= V_cutoff)
@@ -57,15 +55,12 @@ class FrictionPotential : public FrictionPotentialWrapper {
 
   double regularity(double V) const {
     assert(V >= 0);
-    // TODO: Make this controllable
-    if (std::abs(V - V_cutoff) < 1e-14)
+    if (std::abs(V - V_cutoff) < 1e-14) // TODO
       return std::numeric_limits<double>::infinity();
 
     return std::abs(second_deriv(V));
   }
 
-  //    V_m = V_0 exp(-K/a),
-  // with K = -a log(V_m / V_0) = mu_0 + b [ alpha + log(V_0 / L) ]
   void updateLogState(double logState) {
     logV_m = std::log(fd.V0) +
              (-(fd.mu0 + fd.b * (logState + std::log(fd.V0 / fd.L))) / fd.a);