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how to define a source

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Old   June 23, 2009, 02:14
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I want to simulate pollutant diffusion. On a wall there is a hole, bringing in the pollutant, Now I split the hole seperately and define it as a zone, then define the
source term in the zone. but it will result in a bad mesh quality for the hole size is small. I want to define the source term by udf. who can tell me how to write the c program?
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source, udf

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