Numerical Dissipation of Upwind in LES

orxan.shibli · October 23, 2011, 09:28

Hi all,

I know upwind schemes cause numerical dissipation if advective form is used. But I don't see any numerical dissipation if divergence form is used instead. For example, in 2nd order upwind there is no 2nd derivative to be added to SGS viscosity.

What you think?

Regards

cfdnewbie · October 23, 2011, 14:02

Dear Orxan,
what method are you talking about? FD?

orxan.shibli · October 24, 2011, 06:59

Quote:

Originally Posted by cfdnewbie

Dear Orxan,
what method are you talking about? FD?

I am using Finite Volume. To write them in a conservative form I use divergence form of convective term.

October 23, 2011, 09:28	Numerical Dissipation of Upwind in LES	#1
orxan.shibli Member Join Date: Aug 2011 Posts: 30 Rep Power: 14	Hi all, I know upwind schemes cause numerical dissipation if advective form is used. But I don't see any numerical dissipation if divergence form is used instead. For example, in 2nd order upwind there is no 2nd derivative to be added to SGS viscosity. What you think? Regards

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October 23, 2011, 14:02		#2
cfdnewbie Senior Member cfdnewbie Join Date: Mar 2010 Posts: 557 Rep Power: 20	Dear Orxan, what method are you talking about? FD?