trouble with Source Term

sambatra · October 1, 2010, 04:29

Hi there,
I would like to implement a Source Term.
The trouble is that it is calculated thanks to a lot of variables and the BC of that source term is not specified.I am a bit tempted to put a zerogradient everywhere when I implement it.Can anybody tell me what I should do?How can I specify the BC of that source term?
Best Regards.

herbert · October 4, 2010, 03:22

Hi sambatra,

why do you need BC's for a source term? The choice of BC's is only important, if you want to solve an equation for that field. If it is only a source in an equation for another field you can use the default calculated BC. (BTW the boundaryField shouldn't be used when having a volumetric source. In fact it should make no difference which kind of BC you use.)

Regards,
Stefan

sambatra · October 5, 2010, 03:28

Hi Hebert,
Thank you so much for your information!
the reason I was asking that question was that the sources are to be relaxed so I guess creating field is required!

BR,

October 1, 2010, 04:29	trouble with Source Term	#1
sambatra New Member andrianomena Join Date: Mar 2009 Location: madagascar Posts: 23 Rep Power: 17	Hi there, I would like to implement a Source Term. The trouble is that it is calculated thanks to a lot of variables and the BC of that source term is not specified.I am a bit tempted to put a zerogradient everywhere when I implement it.Can anybody tell me what I should do?How can I specify the BC of that source term? Best Regards.

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October 4, 2010, 03:22		#2
herbert Senior Member Stefan Herbert Join Date: Dec 2009 Location: Darmstadt, Germany Posts: 129 Rep Power: 17	Hi sambatra, why do you need BC's for a source term? The choice of BC's is only important, if you want to solve an equation for that field. If it is only a source in an equation for another field you can use the default calculated BC. (BTW the boundaryField shouldn't be used when having a volumetric source. In fact it should make no difference which kind of BC you use.) Regards, Stefan

October 5, 2010, 03:28		#3
sambatra New Member andrianomena Join Date: Mar 2009 Location: madagascar Posts: 23 Rep Power: 17	Hi Hebert, Thank you so much for your information! the reason I was asking that question was that the sources are to be relaxed so I guess creating field is required! BR,