divScheme for recirculating flows

babakflame · October 6, 2013, 13:50

Dear Buddies

In my case, flow has recirculation zones (cause its a bluff-body stabilized flow). which scheme do you prefer for the following divergence operations:

div(phi,U)
div(phiU,p)

My flow field must have both positive and negative values together in the 3-D domain.
My suggestion is Gauss upwind.

Regards
Bobi

tomf · October 7, 2013, 12:05

Dear Bobi,

Upwind will be way too diffusive, might even remove the recirculation zone at all. I would suggest to use one of the TVD schemes like Gamma. Please have a look in the user guide. limitedLinear or linearUpwind would also be 'standard' candidates.

Best would be to try and see what works best, maybe for a smaller but similar problem in order to save time.

Regards,
Tom

babakflame · October 8, 2013, 01:05

Hi Tom

Thanks for your reply; Actually I tested upwind and limitedlinear and as you have mentioned The result was much better stability for limitedlinear scheme.

Regards
Bobi

October 6, 2013, 13:50	divScheme for recirculating flows	#1
babakflame Senior Member Bobby Join Date: Oct 2012 Location: Michigan Posts: 454 Rep Power: 15	Dear Buddies In my case, flow has recirculation zones (cause its a bluff-body stabilized flow). which scheme do you prefer for the following divergence operations: div(phi,U) div(phiU,p) My flow field must have both positive and negative values together in the 3-D domain. My suggestion is Gauss upwind. Regards Bobi

October 8, 2013, 01:05		#3
babakflame Senior Member Bobby Join Date: Oct 2012 Location: Michigan Posts: 454 Rep Power: 15	Hi Tom Thanks for your reply; Actually I tested upwind and limitedlinear and as you have mentioned The result was much better stability for limitedlinear scheme. Regards Bobi omidra likes this.

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October 7, 2013, 12:05		#2
tomf Senior Member Tom Fahner Join Date: Mar 2009 Location: Breda, Netherlands Posts: 634 Rep Power: 32	Dear Bobi, Upwind will be way too diffusive, might even remove the recirculation zone at all. I would suggest to use one of the TVD schemes like Gamma. Please have a look in the user guide. limitedLinear or linearUpwind would also be 'standard' candidates. Best would be to try and see what works best, maybe for a smaller but similar problem in order to save time. Regards, Tom