You need to calculate that ratio only in the fluid cells and the upper most in the near wall cells. There you calculate the amount which needs to be adsrobed or desorbed. That rate of flux / flow rate, can be used now at the solid wall side to provide a flux for the UDS / Boundary Value for UDS / Volumetric Source Rate.
Is not an easy step which I can comment on this open platform.
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New Post - Reply To: How to call variable in solid domain to use in fluid domain?
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