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Size of matrix exported from Comsol : understanding?
Posted 11 set 2018, 03:46 GMT-4 General, Mesh, Results & Visualization Version 5.3 1 Reply
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Deal all,
can you explain how to understand the size of stiffness matrix which is exported from comsol,
for example i have a 2d cantilever beam, discritized with nel_x x nel_y=20 x 10 => nnode_x x nnode_y = (20+1) x (10+1)=231 nodes, and ndofs=231 x 2=462 degree of freedoms,
so i expect the size of stiffness matrix will be K(full)=462x462, but the size exported from Comsol is: 1322x1322
you can following the matlab file for runing in Comsol server;
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Hi,
You are probably using 2nd order serendipity elements (which is the default in Solid Mechanics).
(41*21 - 10*20)*2 = 1322
Regards,
Henrik
Henrik Sönnerlind
COMSOL