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-   -   Writing PDE BC for mass fraction in UDF?? (http://www.cfd-online.com/Forums/fluent/33420-writing-pde-bc-mass-fraction-udf.html)

KKLAU April 7, 2004 03:53

Writing PDE BC for mass fraction in UDF??
 
To All Fluent Experts all over the world,

Thanks you for your assistance in solving my earlier problem. I am now facing another problem.

How to write the PDE BC with UDF for mass fraction ? There is a built macro for Div (v)/Div (y). But i cant find any macro for Div(m)/Div(y) where m = mass fraction.

By the way, i am going to include it on the wall boundary.

Is there any other way to do it?

Thank you.

From

KKLAU


FJ April 7, 2004 04:53

Re: Writing PDE BC for mass fraction in UDF??
 
Hi,

There are not any macros for it. So we have to define the differential equation in UDF.

Mass fraction of a species is defined as "C_YI(c, t, 0)". This "0" is the species number in the panel of "Define-Materials-mixture templete-names-edit-selected species".

Thanx

FJ

thomas April 7, 2004 05:54

Re: Writing PDE BC for mass fraction in UDF??
 
Please define your and what you are trying to simulate a bit more. Thomas


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