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Calculating volume from postprocessed data
Posted 25 gen 2010, 11:28 GMT-5 1 Reply
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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
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 gen 2010, 03:14 GMT-5
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Posted:
1 decade ago
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
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