From a444ed4ca55e94e35791fa35ca629d4ea711a4ff Mon Sep 17 00:00:00 2001
From: Oliver Sander <sander@igpm.rwth-aachen.de>
Date: Wed, 14 Jun 2006 12:51:55 +0000
Subject: [PATCH] bugfix: don't integrate over the strain on each element.
instead compute the element average
[[Imported from SVN: r837]]
---
src/rodassembler.cc | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/src/rodassembler.cc b/src/rodassembler.cc
index fe8c33b3..6cea8711 100644
--- a/src/rodassembler.cc
+++ b/src/rodassembler.cc
@@ -777,6 +777,8 @@ getStrain(const std::vector<Configuration>& sol,
// Loop over all elements
for (; it!=endIt; ++it) {
+ int elementIdx = indexSet.index(*it);
+
// Extract local solution on this element
const LagrangeShapeFunctionSet<double, double, gridDim> & baseSet
= Dune::LagrangeShapeFunctions<double, double, gridDim>::general(it->geometry().type(), elementOrder);
@@ -872,7 +874,6 @@ getStrain(const std::vector<Configuration>& sol,
u[2] = 2 * ( q[1]*q_s[0] - q[0]*q_s[1] + q[3]*q_s[2] - q[2]*q_s[3]);
// Sum it all up
- int elementIdx = indexSet.index(*it);
strain[elementIdx][0] += weight * v[0];
strain[elementIdx][1] += weight * v[1];
strain[elementIdx][2] += weight * v[2];
@@ -882,6 +883,14 @@ getStrain(const std::vector<Configuration>& sol,
}
+ // /////////////////////////////////////////////////////////////////////////
+ // We want the average strain per element. Therefore we have to divide
+ // the integral we just computed by the element volume.
+ // /////////////////////////////////////////////////////////////////////////
+ // we know the element is a line, therefore the integration element is the volume
+ FieldVector<double,1> dummyPos(0.5);
+ strain[elementIdx] /= it->geometry().integrationElement(dummyPos);
+
}
}
--
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