Curvature Correction & Reattachment Mod.

September 14, 2007, 10:41

Hello,

CFX 11.0 includes the SST Curvature Correction and SST Reattachment Modification as beta features. Can anyone give detailed information on what these options are and how they work ? Or alternatively does anyone know where I can learn more on this subject (published paper / book) ?

Also, how can I use these options in PRE ? Shouldn't they appear in the Expert Parameters section after I enable beta features ?

Thanks, your help is always appreciated !

Felix

September 18, 2007, 10:36

Hi Felix,

as far as the SST Curvature Correction is concerned I can tell from my own experience that this beta feature is not really implemented yet. I had only a vanishing influence on my test case with the CFX SSTCC activated or deactivated.

In a first test I found that the SST curvature correction proposed by Hellsten (AIAA-98-2554) gave much better results. But it also lead to higher residuals.

When you find out anything else please let me know.

Take care, Andreas

PCFD · July 14, 2010, 08:51

Hi Jeromin,

with which code did you test the cc-model proposed by Hellsten? It wasn't CFX, right?

Are you using the CC-model in version 12.1, CFX? HAve you varied the CScale-coefficient. Would be interesting to know if that impacts your flow as well. It had quite a big influence on my results - but my experience is limited to version 12.0!!! I will analyze it now in 12.1.

Regards.

stumpy · July 14, 2010, 09:53

Curvature Correction would only make a difference for strongly swirling flows. In my experience SST + CC gave results similar to a Reynolds Stress model, but without the added expense and with the wall treatment benefits that come with SST. The option appears in Pre on the Domain > Fluid Models panel, under Advanced Control below where you pick your turbulence model (not sure if it's there in 11.0 though). I haven't used the reattachment modification before.

ourdean · December 18, 2010, 16:28

Hi everyone, I was wondering if anyone had the source code for the curvature correction which i can eyeball and implement, I would really appreciate this please. Could you send/forward to ourdean@gmail.com
Cheers

ghorrocks · December 19, 2010, 17:04

The source code is not available.

September 14, 2007, 10:41	Curvature Correction & Reattachment Mod.	#1
Felix Guest Posts: n/a	Hello, CFX 11.0 includes the SST Curvature Correction and SST Reattachment Modification as beta features. Can anyone give detailed information on what these options are and how they work ? Or alternatively does anyone know where I can learn more on this subject (published paper / book) ? Also, how can I use these options in PRE ? Shouldn't they appear in the Expert Parameters section after I enable beta features ? Thanks, your help is always appreciated ! Felix

September 18, 2007, 10:36	Re: Curvature Correction & Reattachment Mod.	#2
Andreas Jeromin Guest Posts: n/a	Hi Felix, as far as the SST Curvature Correction is concerned I can tell from my own experience that this beta feature is not really implemented yet. I had only a vanishing influence on my test case with the CFX SSTCC activated or deactivated. In a first test I found that the SST curvature correction proposed by Hellsten (AIAA-98-2554) gave much better results. But it also lead to higher residuals. When you find out anything else please let me know. Take care, Andreas

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July 14, 2010, 08:51		#3
PCFD New Member Join Date: May 2009 Posts: 24 Rep Power: 17	Hi Jeromin, with which code did you test the cc-model proposed by Hellsten? It wasn't CFX, right? Are you using the CC-model in version 12.1, CFX? HAve you varied the CScale-coefficient. Would be interesting to know if that impacts your flow as well. It had quite a big influence on my results - but my experience is limited to version 12.0!!! I will analyze it now in 12.1. Regards.

July 14, 2010, 09:53		#4
stumpy Senior Member Join Date: Apr 2009 Posts: 531 Rep Power: 21	Curvature Correction would only make a difference for strongly swirling flows. In my experience SST + CC gave results similar to a Reynolds Stress model, but without the added expense and with the wall treatment benefits that come with SST. The option appears in Pre on the Domain > Fluid Models panel, under Advanced Control below where you pick your turbulence model (not sure if it's there in 11.0 though). I haven't used the reattachment modification before.

December 18, 2010, 16:28		#5
ourdean New Member dean Join Date: Dec 2010 Posts: 4 Rep Power: 15	Hi everyone, I was wondering if anyone had the source code for the curvature correction which i can eyeball and implement, I would really appreciate this please. Could you send/forward to ourdean@gmail.com Cheers

December 19, 2010, 17:04		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,854 Rep Power: 144	The source code is not available.