private void ApplyEnrichmentFunctions()
{
foreach (var node in crackTipNodesNew)
{
double[] enrichmentValues = CrackTipEnrichments.EvaluateFunctionsAt(node);
node.EnrichmentItems[CrackTipEnrichments] = enrichmentValues;
}
// There is no need to process each mesh node. Once a node is enriched with Heaviside it will stay that way until the
// end. Even if the crack curves towards itself and a crack tip comes near the node, the original discontinuity must
// be represented by the original Heaviside (this case creates a lot of problems and cannot be modeled with LSM
// accurately anyway).
// I am not sure if the value of the Heaviside enrichment doesn't change for elements around the crack tip, once the
// crack propagates. In first order LSM this is improbable, since there cannot be kinks inside the element, but what
// about explicit cracks and higher order LSM?
//TODO: It could be sped up by only updating the Heaviside enrichments of nodes that have updated body
// level sets, which requires tracking them.
// - Done. Tracking newly enriched nodes is useful for many reasons.
//TODO: should I also clear and reapply all Heaviside enrichments? It is safer and might be useful for e.g.
// reanalysis. Certainly I must not clear all node enrichments, as they may include material interfaces etc.
// - Ans: nope in reanalysis old Heaviside enrichments are assumed to stay the same (not sure if that is correct
// though)
foreach (var node in crackBodyNodesNew)
{
double[] enrichmentValues = CrackBodyEnrichment.EvaluateFunctionsAt(node);
node.EnrichmentItems[CrackBodyEnrichment] = enrichmentValues;
}
}
private void ApplyEnrichmentFunctions(HashSet <XNode> bodyNodes, HashSet <XNode> tipNodes)
{
// O(n) operation. TODO: This could be sped up by tracking the tip enriched nodes of each step.
foreach (var node in Mesh.Nodes)
{
node.EnrichmentItems.Remove(CrackTipEnrichments);
}
foreach (var node in tipNodes)
{
double[] enrichmentValues = CrackTipEnrichments.EvaluateFunctionsAt(node);
node.EnrichmentItems[CrackTipEnrichments] = enrichmentValues;
}
// Heaviside enrichment is never removed (unless the crack curves towards itself, but that creates a lot of
// problems and cannot be modeled with LSM accurately). Thus there is no need to process each mesh node.
// TODO: It could be sped up by only updating the Heaviside enrichments of nodes that have updated body
// level sets, which requires tracking them.
foreach (var node in bodyNodes)
{
double[] enrichmentValues = CrackBodyEnrichment.EvaluateFunctionsAt(node);
node.EnrichmentItems[CrackBodyEnrichment] = enrichmentValues;
}
}
