Gradient Discretization CFX vs Fluent

Scott Nordsen · December 2, 2009, 12:57

I am a traditional Fluent user trying to compare CFX runs to Fluent runs.

A few versions ago Fluent added an option under discretization for gradients

1) Green-Gauss Node based
2) Green-Gauss Cell based
3) Least Squares Cell based

I am having trouble finding help on 1) does CFX have similar options 2) what is CFXs default

If a simple answer exists (i.e. CFX only does #2 from the list above) that would be great.

Thanks in advance

ghorrocks · December 2, 2009, 17:46

The approach in CFX is totally different to Fluent. Fluent is cell-centred so the gradients need to be calculated at the cell boundaries and hence the options you list. CFX uses a semi-Finite Element approach with shape functions. See the theory manual in the documentation for more details.

December 2, 2009, 12:57	Gradient Discretization CFX vs Fluent	#1
Scott Nordsen New Member Join Date: Jun 2009 Posts: 13 Rep Power: 17	I am a traditional Fluent user trying to compare CFX runs to Fluent runs. A few versions ago Fluent added an option under discretization for gradients 1) Green-Gauss Node based 2) Green-Gauss Cell based 3) Least Squares Cell based I am having trouble finding help on 1) does CFX have similar options 2) what is CFXs default If a simple answer exists (i.e. CFX only does #2 from the list above) that would be great. Thanks in advance

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December 2, 2009, 17:46		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,870 Rep Power: 144	The approach in CFX is totally different to Fluent. Fluent is cell-centred so the gradients need to be calculated at the cell boundaries and hence the options you list. CFX uses a semi-Finite Element approach with shape functions. See the theory manual in the documentation for more details.