a problem about user define scalars(uds)

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 June 24, 2012, 04:32 a problem about user define scalars(uds) #1 Member   chenxizhong Join Date: Feb 2012 Posts: 30 Rep Power: 5 Hi, all. Recently I want to use Fluent's user define scalars(uds) in a multiphase problem . I find that the uds in multiphase has the following formulation So I have a problem about the diffusion term. When I input the value "uds diffsivity" In "Create /Edit Material " should I multiply by the density and the voidage myself ? Or Fluent will auto multiply the voidage of the phase? Can anybody help me? thanks.

June 27, 2012, 07:40
#2
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As you can see in the uds equation, diffusivity should be given to Fluent in the form -- same units as dynamic viscosity (Pa.s).

Fluent takes care of multiplying by voidage itself.

Quote:
 Originally Posted by chenxizh Hi, all. Recently I want to use Fluent's user define scalars(uds) in a multiphase problem . I find that the uds in multiphase has the following formulation So I have a problem about the diffusion term. When I input the value "uds diffsivity" In "Create /Edit Material " should I multiply by the density and the voidage myself ? Or Fluent will auto multiply the voidage of the phase? Can anybody help me? thanks.

June 29, 2012, 08:44
#3
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chenxizhong
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Hi, So you mean that I should give the value "density multiply the diffusivity coefficention" and ignore the voidage thing, Did I get it? thanks.
Quote:
 Originally Posted by akm As you can see in the uds equation, diffusivity should be given to Fluent in the form -- same units as dynamic viscosity (Pa.s). Fluent takes care of multiplying by voidage itself.

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