Difference between revisions of "Surface Normals"
(Created page with "The calculation of surface normals is a crucial step in multimaterial mode MPM. == Introduction == The surface normal is a key component of multimaterial mode MPM calculati...") |
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== Normal Vector Options == | == Normal Vector Options == | ||
When multimaterial mode MPM was initially developed, contact was handled separately for each material velocity field and the normal vector was found that material's mass gradient. [[NairnMPM]] has implemented new methods that seem to work better. No one method works for all problems, which is why multiple options are available. This section describes the available options. | When multimaterial mode MPM was initially developed, contact was handled separately for each material's velocity field and the normal vector was found from that material's mass gradient. [[NairnMPM]] has implemented new methods that seem to work better. No one method works for all problems, which is why multiple options are available. This section describes the available options. | ||
=== Each Material's Gradient === | === Each Material's Gradient === | ||
Show picture two materials with two normals | |||
=== Maximum Gradient === | === Maximum Gradient === | ||
Show full vs partial | |||
=== Average Gradient === | |||
Show top with two edges | |||
=== Maximum Volume === | === Maximum Volume === | ||
Just describe | |||
=== Custom Specified Normal === | === Custom Specified Normal === | ||
Developer flags and maybe more options int he future | |||
Revision as of 22:19, 19 September 2013
The calculation of surface normals is a crucial step in multimaterial mode MPM.
Introduction
The surface normal is a key component of multimaterial mode MPM calculations. First, normals are needed to find the component of the velocity in the approaching direction, which is used to detect contact. Second, the normals are needed implement contact mechanics or |imperfect interfaces. Practical experimental using multimaterial mode MPM simulations has revealed that accuracy of results is very sensitive to the method used to find the normals.
Normal Vector Options
When multimaterial mode MPM was initially developed, contact was handled separately for each material's velocity field and the normal vector was found from that material's mass gradient. NairnMPM has implemented new methods that seem to work better. No one method works for all problems, which is why multiple options are available. This section describes the available options.
Each Material's Gradient
Show picture two materials with two normals
Maximum Gradient
Show full vs partial
Average Gradient
Show top with two edges
Maximum Volume
Just describe
Custom Specified Normal
Developer flags and maybe more options int he future