Inviscid solver and vorticity

Thriller · August 25, 2010, 06:54

Hello,

I would like to know if there is any numerical diffusion or induced vorticity in the inviscid solver in Fluent. Because I get 2D vortex shedding but I am not sure where the vorticity comes from. Unless the shedding is inviscid?

Thanks.

tas38 · October 5, 2010, 09:14

1st order upwind and 2nd order upwind spatial discretization schemes (both available in Fluent) introduce some numerical diffusion. The diffusion will be reduced if using the second-order scheme.

Vortex shedding with an inviscid solver is a purely numerical phenomenon.

August 25, 2010, 06:54	Inviscid solver and vorticity	#1
Thriller New Member Join Date: Apr 2009 Posts: 7 Rep Power: 17	Hello, I would like to know if there is any numerical diffusion or induced vorticity in the inviscid solver in Fluent. Because I get 2D vortex shedding but I am not sure where the vorticity comes from. Unless the shedding is inviscid? Thanks.

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October 5, 2010, 09:14		#2
tas38 Senior Member Troy Snyder Join Date: Jul 2009 Location: Akron, OH Posts: 219 Rep Power: 18	1st order upwind and 2nd order upwind spatial discretization schemes (both available in Fluent) introduce some numerical diffusion. The diffusion will be reduced if using the second-order scheme. Vortex shedding with an inviscid solver is a purely numerical phenomenon.