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Calculating the volume under an isosurface?

Posted 3 août 2015, 17:03 UTC−4 Heat Transfer & Phase Change, Parameters, Variables, & Functions, Results & Visualization, Studies & Solvers Version 4.3 1 Reply

Lawrence Lau
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I am using one of the COMSOL tutorial models and I would like to know if there is a way to calculate the volume underneath the isosurface.

I am using the heat transfer radiofrequency ablation model. There is an option to view the isosurface/contours, but I would like to know how to calculate the amount of tissue underneath this isosurface.

Any help at all is much appreciated.
1 Reply Last Post 4 août 2015, 02:11 UTC−4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 9 years ago 4 août 2015, 02:11 UTC−4
Hi

I have not fully identified the model you refer to but a volume or a surface is simply the domain/boundary integration of the value "1" over the defined domain/boundary.

If you now have a function f(x,y,z,t) defining an area you use a Bolean expression i.e. f(x,y,z,t)>0.5 instead of the scalar "1" and you get your volume/surface (or length in 1D)

--
Good luck
Ivar
Hi I have not fully identified the model you refer to but a volume or a surface is simply the domain/boundary integration of the value "1" over the defined domain/boundary. If you now have a function f(x,y,z,t) defining an area you use a Bolean expression i.e. f(x,y,z,t)>0.5 instead of the scalar "1" and you get your volume/surface (or length in 1D) -- Good luck Ivar

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