Heat Source
The Heat Source describes heat generation within the domain. Express heating and cooling with positive and negative values, respectively. Add one or more nodes as needed — all heat sources within a domain contribute to the total heat source.
Heat Source
Click the General source, Linear source or Heat rate button.
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For General source enter a value for the distributed heat source Q (SI unit: W/m3).
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For Heat rate enter a value for the heat rate P0(SI unit: W). In this case Q=P0/L where L is the total length of the selected boundaries.
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For Linear source (Q = qs·T) enter the Linear heat source qs (SI unit: W/(m3·K)).
The advantage of writing the source in this form is that it can be stabilized by the streamline diffusion. The theory covers qs that is independent of the temperature, but some stability can be gained as long as qs is only weakly dependent on the temperature.
Numerical Stabilization in the COMSOL Multiphysics Reference Manual