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Resolution of Comsol Simulations
Posted Jan 6, 2012, 2:56 a.m. EST Structural Mechanics Version 3.5a 1 Reply
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Hello,
I am just wondering what is the minimum resolvable changes in result that we can correctly detect in Comsol.
I would like to change some of the conditions, and study their effect on resonance frequency of cantilever. However, I don't know how to validate the results.
At some conditions, I expect very small change (e.g. 0.001% of the eigenfrequency) in some conditions. I am mainly concerned whether this much resolution is achievable or not.
I appreciate any thoughts.
Thanks,
Som
I am just wondering what is the minimum resolvable changes in result that we can correctly detect in Comsol.
I would like to change some of the conditions, and study their effect on resonance frequency of cantilever. However, I don't know how to validate the results.
At some conditions, I expect very small change (e.g. 0.001% of the eigenfrequency) in some conditions. I am mainly concerned whether this much resolution is achievable or not.
I appreciate any thoughts.
Thanks,
Som
1 Reply Last Post Jan 6, 2012, 6:26 a.m. EST
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Posted:
1 decade ago
Hi
you have the numerical resolution of binary number "eps" (try to look at its value in the Parameter section with a
myvar = eps
But that is seldom the limiting one for a full model, mostly it is mesh density related (and shape function value) and then most important: Solver Relative & Absolute Tolerances (both might not apply for all solvers)
My way is to double the mesh and look at the effect, this gives a good first order indication
--
Good luck
Ivar
you have the numerical resolution of binary number "eps" (try to look at its value in the Parameter section with a
myvar = eps
But that is seldom the limiting one for a full model, mostly it is mesh density related (and shape function value) and then most important: Solver Relative & Absolute Tolerances (both might not apply for all solvers)
My way is to double the mesh and look at the effect, this gives a good first order indication
--
Good luck
Ivar