Cfx-Pre subdomain

izzy · March 14, 2013, 02:38

Hi,

I have a question about the function subdomain in cfx-pre. The general Momentum Source should be realised as a function on the float, but i just can realise a value or expression on this area.. Is it possible to realise the momentum source as a function? and do somebody know how?
Hope its very well described.

Thanks!

ghorrocks · March 14, 2013, 05:30

Yes, sources can be functions. This is well described in the documentation.

Lance · March 15, 2013, 03:01

A related question: is there a way to create a general momentum source on a point instead of a subdomain?

ghorrocks · March 16, 2013, 05:09

The documentation states momentum sources are not available on points. I am not sure why, but I suspect it becomes a convergence problem. So the simple work-around is to use a little volume and mesh it with a single element (which is what point source act on anyway, this is not a simplification) so you can use a normal volume source.

Lance · March 18, 2013, 01:55

Quote:

Originally Posted by ghorrocks

[...] simple work-around is to use a little volume and mesh it with a single element (which is what point source act on anyway, this is not a simplification) so you can use a normal volume source.

Yes, that's what Im doing at the moment. However, hexa meshing in icem becomes a real pain, and that's why I asked if someone knew a smart way around it.

March 14, 2013, 02:38	Cfx-Pre subdomain	#1
izzy New Member Join Date: Mar 2013 Posts: 1 Rep Power: 0	Hi, I have a question about the function subdomain in cfx-pre. The general Momentum Source should be realised as a function on the float, but i just can realise a value or expression on this area.. Is it possible to realise the momentum source as a function? and do somebody know how? Hope its very well described. Thanks!

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March 14, 2013, 05:30		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Yes, sources can be functions. This is well described in the documentation.

March 15, 2013, 03:01		#3
Lance Senior Member Lance Join Date: Mar 2009 Posts: 669 Rep Power: 22	A related question: is there a way to create a general momentum source on a point instead of a subdomain?

March 16, 2013, 05:09		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	The documentation states momentum sources are not available on points. I am not sure why, but I suspect it becomes a convergence problem. So the simple work-around is to use a little volume and mesh it with a single element (which is what point source act on anyway, this is not a simplification) so you can use a normal volume source.