Correction in time averaging

NonLinearSolver/nlsolver/nonLinearMechSolver.cpp

@@ -3838,6 +3838,9 @@ void nonLinearMechSolver::computePeriodAveragedIPDataOnPhysical(const double tst
                     {
                         double avgValue = 0.0;
                         int count = 0;
+                        double t_0 = 0.0;
+                        double t_i = 0.0;
+                        double dt = 0.0;
                         double sum_dt = 0.0;
                         // here can check GP against std::map coordinates for correctness
@@ -3846,16 +3849,21 @@ void nonLinearMechSolver::computePeriodAveragedIPDataOnPhysical(const double tst
                         for(auto it = IPVariableOverTime.begin(); it != IPVariableOverTime.end(); ++it)
                         {
                             const double t = it->first;
+                            t_i = it->first;
                             if(t >= tstart && t <= tend)
                             {
                                 count++;
-                                sum_dt += t;
+                                dt = (t_i - t_0);
+                                sum_dt += dt;
                                 // compute average of IPVariable over given time period
                                 //avgValue += IPVariableOverTime.at(t).at(eleNum).at(j);
                                 // sum(w_AV * dt)
-                                avgValue += (IPVariableOverTime.at(t).at(eleNum).at(j)) * t;
+                                avgValue += (IPVariableOverTime.at(t).at(eleNum).at(j)) * dt;
+
+                                // update time
+                                t_0 = t_i;
                             }
                         }
                         //avgValue /= count;

[Vinayak Gholap]

Mistake: w_AV * current time

Correction: w_AV * time-step size

Note: If time-step size dt is constant, this leads to mean of w_AV.