# Line intergral in 3D

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**Hi everyone:**

I am wondering if any one knows how to define a line integral over a 3D domain?

The problem is I have a 3D mesh, and I put a line source defined on it boundary, such as line heat source for heat transfer or line force for solid mechanics, how do I define such ds? As far as I know, if it is a point source, we could use PointSource, if it is applied on a 2D area, I could use mesh function to define such ds(), but it is a line source, the ds() could result to zero as the Lebesgue integral of a line is zero.

Any advise would be appreciated.

Yuxiang

I am wondering if any one knows how to define a line integral over a 3D domain?

The problem is I have a 3D mesh, and I put a line source defined on it boundary, such as line heat source for heat transfer or line force for solid mechanics, how do I define such ds? As far as I know, if it is a point source, we could use PointSource, if it is applied on a 2D area, I could use mesh function to define such ds(), but it is a line source, the ds() could result to zero as the Lebesgue integral of a line is zero.

Any advise would be appreciated.

Yuxiang

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