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Forum: FLUENT

September 26, 2011, 16:21

Replies: 10

Quick UDS question

Views: 2,153

Posted By Amir

Your UDF is correct but you will need something...

Your UDF is correct but you will need something more than this justification! if the dimension of concentrations are Torr, the dimension of "Rnomax" should be Torr too!!! However, such...

Forum: FLUENT

September 26, 2011, 13:20

Replies: 10

Quick UDS question

Views: 2,153

Posted By Amir

Dear Luke, I think there is a problem in...

Dear Luke,

I think there is a problem in your formula! The dimensions are not compatible; e.g., you've added Conc. Oxygen and KmeNOS which have different dimensions and also the whole dimension...

Forum: FLUENT

September 26, 2011, 08:28

Replies: 10

Quick UDS question

Views: 2,153

Posted By Amir

No!!! \frac{\partial}{\partial t} (\rho C) +...

No!!!
\frac{\partial}{\partial t} (\rho C) + \nabla . (\rho U C) = \nabla . (\rho D \nabla C)
c can have any dimension. (you have to set \rho D)

Bests,

Forum: FLUENT

September 26, 2011, 03:06

Replies: 10

Quick UDS question

Views: 2,153

Posted By Amir

No, you have to set a parameter which its...

No, you have to set a parameter which its dimension is kg/m.s there. As I said before, this parameter is : (fluid density*diffusion coefficient of scalar in that fluid), which its dimension is kg/m.s...

Forum: FLUENT

September 23, 2011, 15:18

Replies: 10

Quick UDS question

Views: 2,153

Posted By Amir

UDS is just a scalar, you can consider it as a...

UDS is just a scalar, you can consider it as a non-dimension variable (normalizes parameter).
UDS diffusivity is equal to (fluid density*diffusion coefficient of scalar in that fluid); this...

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