[Gmsh] mesh element sizes
peter.metaxas at uwa.edu.au
Fri Apr 20 16:37:06 CEST 2012
Troubled by some results on a more complex geo file (I noticed that using mesh element sizes of 2.5 and 3 generated identically sized .msh files) I did a test of meshing on a single line with a length of 10 (ie. 1D meshing only). In both cases (actual and test cases), I specify "desired mesh element sizes at the geometrical points of the model" using the point command.
Here's my test geo file:
I expected that using a mesh element size of 1 (specified using "disc") would give me 10 elements along my line. It however only gives me 9 (8 nodes along the line). The results are shown below:
disc=1 9 elements
disc=0.9 11 elements
disc=0.9999 10 elements
The same general type of effect seems to hold for other desired element sizes: disc=2.5 yields 3 elements (rather than the expected 4 elements which can be obtained using disc=2.4).
I couldn't find information on such effects - apologies if it has been discussed previously though. Is this maybe a known effect of rounding, precision or the meshing algorithm itself?
Thanks in advance.
Best regards, Peter.
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