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-   -   User defined scalar transport problem (UDS) (http://www.cfd-online.com/Forums/fluent/76899-user-defined-scalar-transport-problem-uds.html)

jpcfd June 8, 2010 04:50

User defined scalar transport problem (UDS)
 
Hi,

Im working in 2D drying problem of a concrete specimen and im using a diffusive transport scalar through a solid domain as moisture.

Im using the diffusion values taken for the literature but im realizing that i obtain extremely large drying times. And im not confidence with the diffusivity for the equation.

I know the diffusive term of the equation that fluent manages is multiplied by the density. And in fluent material definition panel the UDS diffusivity is in kg/m-s units, what is not coherent with the m2/s units.

What i suppose to do to introduce the correct value for the diffusivity. Is density depending? it my 2D problem depends on any reference value?

I will apreciate any help. Thanks in advance.

Javier.


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