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Calculating volume from postprocessed data

Posted 25 janv. 2010, 11:28 UTC−5 1 Reply

Constantinos Katevatis
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I have a compound diffusing through my model. Once the Comsol processes the diffusion/convection physics, is there a way to calculate the volume for which the concentration of the compound is higher that a given threshold? I tried exporting the postprocessed data as a coordinates and then using Matlab to count the number of points above the threshold, but the points were unevenly distributed. It appeared that the density of the points corresponded with the density of the tetrahedrons from the mesh (finer tetrahedrons = more dense points).

Is there a way to calculate the volume at which the concentration is above a give threshold?
Thanks for the advice,
Constantinos
1 Reply Last Post 26 janv. 2010, 03:14 UTC−5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 26 janv. 2010, 03:14 UTC−5
Hi

yes indeed, there should be a rather easy way.

The volume is obtained by integrating "1" over the sub-domain of interest.

If you replace the "1" by a bolean expression i.e. (c<1.5) where c is your concentration this should do, no ?

if you want the fraction of your volume you must make two variables and then take their ratio

Check it out carefully, there are many "easy" tricks like that in COMSOL once you catch the correct way

Good luck
Ivar
Hi yes indeed, there should be a rather easy way. The volume is obtained by integrating "1" over the sub-domain of interest. If you replace the "1" by a bolean expression i.e. (c

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