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UDF derivative

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Old   March 30, 2012, 04:14
Default UDF derivative
Join Date: Mar 2012
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I want to define a derivative equation in a wall and I don't know what tipe of udf i have to use, can anyone helpme?

my equation is: dC/dx= -v*(1-k)*C/D

V,k and D have value (#define...)

but how can I write de UDF??
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