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Old   June 25, 2009, 12:58
Default question on UDF manual example
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ak6g08 is on a distinguished road
Hello everyone,

can anyone explain to me why C_UDSI_G is multiplied by the cell volume in the following UDF example? (in the udf manual, pasted below). Is this necessary if we want to write a scalar in terms of the derivative of another scalar?? i.e. say Ive got a UDS equation solving for some scalar H and another one solving for some scalar I, say a source term appears in the equation for scalar I, which is given by DH/ i need to write this as C_VOLUME*C_UDSI_G(c,t,index of scalar H)?

Thanks for your help

/************************************************** ******************
UDF for defining user-defined scalars and their gradients
************************************************** *******************/
#include "udf.h"
Thread *t;
cell_t c;
real K_EL = 1.0;
/* Do nothing if gradient isn't allocated yet. */
if (! Data_Valid_P())
C_UDSI(c,t,1) +=
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