First order upwind

June 12, 2004, 10:16

Hi all,

I want to know is it true that a second order upwind always provide a better accuracy than a first order one in all flow problem ?

Thank .

June 12, 2004, 13:57

Yea it should do, at least as long as you get the second order upwind scheme to converge. The first order upwind scheme in fluent is very diffusive and it will quickly smear out all your shear layers etc.

June 13, 2004, 09:09

A higher order scheme is more accurate than a lower order one.

The problem is in the stability of the solution and the speed of convergence, which usually becomes lower as you increase the order of the scheme.

Hi

ap

June 12, 2004, 10:16	First order upwind	#1
leung Guest Posts: n/a	Hi all, I want to know is it true that a second order upwind always provide a better accuracy than a first order one in all flow problem ? Thank .

June 12, 2004, 13:57	Re: First order upwind	#2
Jonas Larsson Guest Posts: n/a	Yea it should do, at least as long as you get the second order upwind scheme to converge. The first order upwind scheme in fluent is very diffusive and it will quickly smear out all your shear layers etc.

June 13, 2004, 09:09	Re: First order upwind	#3
ap Guest Posts: n/a	A higher order scheme is more accurate than a lower order one. The problem is in the stability of the solution and the speed of convergence, which usually becomes lower as you increase the order of the scheme. Hi ap

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