DNS with CFX 11.0

gypas · August 16, 2010, 14:45

hi,

Would it be possible to use DNS directly with CFX 11.00
I have read the following post but was wondering whether there are any
recent developments
http://www.cfd-online.com/Forums/cfx...using-cfx.html
Looking through the documentation and other sources could not get me anywhere
Any ideas welcome

many thanks

ghorrocks · August 16, 2010, 18:22

It is possible to do DNS in CFX... And it is possible to swim across the Pacific Ocean. CFX is not a good tool for DNS. DNS needs low dissipation differencing schemes, fine grids and fine timesteps. CFX has upwinding based differencing schemes (high dissipation), and an implicit numerical approach which is optimised for large time steps, not small ones.

If you want to do DNS then get a code designed for DNS. Even better, write your own then you can optimise it for what you are doing.

gypas · August 16, 2010, 18:36

thanks a lot glenn!
I ll start looking for alternative methods

August 16, 2010, 14:45	DNS with CFX 11.0	#1
gypas New Member catherina Join Date: May 2009 Posts: 7 Rep Power: 16	hi, Would it be possible to use DNS directly with CFX 11.00 I have read the following post but was wondering whether there are any recent developments http://www.cfd-online.com/Forums/cfx...using-cfx.html Looking through the documentation and other sources could not get me anywhere Any ideas welcome many thanks

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August 16, 2010, 18:22		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	It is possible to do DNS in CFX... And it is possible to swim across the Pacific Ocean. CFX is not a good tool for DNS. DNS needs low dissipation differencing schemes, fine grids and fine timesteps. CFX has upwinding based differencing schemes (high dissipation), and an implicit numerical approach which is optimised for large time steps, not small ones. If you want to do DNS then get a code designed for DNS. Even better, write your own then you can optimise it for what you are doing.

August 16, 2010, 18:36		#3
gypas New Member catherina Join Date: May 2009 Posts: 7 Rep Power: 16	thanks a lot glenn! I ll start looking for alternative methods