about DEFINE_SOURCE(name, c, t, dS, eqn)

lx33101128 · March 28, 2009, 10:01

dear all
the UDF manual says that the dS is the source term derivative. Does this term is indispensable or optional? it seems that this term is just used to aid stability, but i am not sure. in my case, if dS was added, the converging rate was very very very slow. howerver, if i didn't set the value of dS, the rate is very rapid.look forward to you reply!!

HenrikS · March 31, 2009, 10:21

It is optional, and should be included if it helps convergence, as far as I understand.

lx33101128 · March 31, 2009, 22:41

thanks very much

March 28, 2009, 10:01	about DEFINE_SOURCE(name, c, t, dS, eqn)	#1
lx33101128 New Member liuxiao Join Date: Mar 2009 Posts: 10 Rep Power: 17	dear all the UDF manual says that the dS is the source term derivative. Does this term is indispensable or optional? it seems that this term is just used to aid stability, but i am not sure. in my case, if dS was added, the converging rate was very very very slow. howerver, if i didn't set the value of dS, the rate is very rapid.look forward to you reply!!

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March 31, 2009, 10:21		#2
HenrikS Member Henrik Ström Join Date: Mar 2009 Posts: 33 Rep Power: 17	It is optional, and should be included if it helps convergence, as far as I understand.

March 31, 2009, 22:41		#3
lx33101128 New Member liuxiao Join Date: Mar 2009 Posts: 10 Rep Power: 17	thanks very much