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Old   April 23, 2011, 01:51
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dear all
i am writing a source-udf. in that formula there is some derivative terms depending on time. i dont know how should i write them or which macro should use, for example there is d/dt(du/dy+dv/dx) in formula for source term. thanks
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Old   April 23, 2011, 13:13
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Hi masumeh,
you know that this kind of UDF executes every iteration so, it's enough that you use global parameter and put the desired variable in, then in new time step use the parameter value for last time step and then put new one to it. (note that you should renew the global parameter every time step not every iteration)
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