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reaction in porous media - surface-to-volume-ratio

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Old   October 1, 2008, 15:58
Default reaction in porous media - surface-to-volume-ratio
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Does anybody have any idea if and how the parameter surface-to-volume-ratio in the fluid boundary condition panel (reaction tab) can be accessed using an UDF? I would like to adjust the ratio for a spatially varying porosity...

Thanks in advance for your responses!
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