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A question about the boundary conditions for a 3d model

Posted Sep 22, 2009, 9:49 p.m. EDT 2 Replies

Yuanhong Dong
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For a 3d model, for instance, a heat transfer problem, I need to apply a line heat source to some edge (line, but not face), namely, on an edge (line), the bc is a given heat flux. How can I do achieve this? Any suggestion is greatly appreciated!
2 Replies Last Post Sep 23, 2009, 3:10 a.m. EDT
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 2 decades ago Sep 23, 2009, 1:24 a.m. EDT
Hi

Well I beleive you must re-express your specification slightly. Heat transfer deals with exchange over surfaces, and transport ina volume (over a given section) and a single edge has no "surface", this is probably the main reason why you will not find point nor edges domains in General heat transfer.

Now it depends what you want to simulate, I would probably start by cutting the volume along the edge slightly, defining a small but defined surface and apply your source term to there.

Even if you have a thin wire, aling your edge, it has a certain surface in contact with your volume.

Is this in line yith your understanding too ?
Good Luck
Ivar
Hi Well I beleive you must re-express your specification slightly. Heat transfer deals with exchange over surfaces, and transport ina volume (over a given section) and a single edge has no "surface", this is probably the main reason why you will not find point nor edges domains in General heat transfer. Now it depends what you want to simulate, I would probably start by cutting the volume along the edge slightly, defining a small but defined surface and apply your source term to there. Even if you have a thin wire, aling your edge, it has a certain surface in contact with your volume. Is this in line yith your understanding too ? Good Luck Ivar
Yuanhong Dong
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Posted: 2 decades ago Sep 23, 2009, 3:10 a.m. EDT
thank u so much!
thank u so much!

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