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If Uniform distribution is selected, f(zgeo) = 1 and the geothermal heat source is assumed to be independent on depth.
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If Exponential distribution is selected, two additional input fields are displayed underneath. The exponential distribution f(zgeo) = exp(zgeo ⁄ hgeo), is defined by the constant Length scale: hgeo and the variable Depth zgeo. The depth can be, for example, the vertical coordinate direction. The heat source achieves its maximum value where zgeo = 0, typically the top surface of a model.
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If Solids is selected, it calculates the geothermal density based on the volume fraction of solid material
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If Porous media is selected, it calculates the geothermal density based on all mobile and immobile components of the porous medium:
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The Geothermal Heating subnode requires the Subsurface Flow Module. For a detailed overview of the functionality available in each product, visit https://www.comsol.com/products/specifications/
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