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Fluent User defined Scalars and UDF

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Old   February 16, 2011, 21:16
Smile Fluent User defined Scalars and UDF
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Hi, I am trying to solve 2 user defined scalar mass transport equations in a system where there is air bubble rising from a submerged orifice in aqueous solution of surfactant SDS. Im using VOF model in fluent. My 1st equn is scalar C (bulk concentration) to be solved only in water domain (ie volume fraction = 0) and 2nd scalar equation is for f (surface concentration) to be solved only in the region of interface ( 0 < volume fraction < 1).
Is it possible to limit the solution domain of above scalar equations using a UDF?
and if yes, is there a way to put boundary condition on the interface region for the same?
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mass transport, uds

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