GGI Vorticity

louisgag · April 24, 2009, 20:33

Hi Foamers,

I'm using the latest svn with a GGI interface and I noticed that when I run the vorticity tool on the case and then visualize in paraFoam, the vorticty at the interface is really weird (high values all along the interface), for almost all my runs.. However, the flow field around the interface is fine in terms of pressure, velocity, and vorticty... Could that be an issue with the vorticity tool when used with GGI?

Thanks for your feedback,

-Louis

yuhai · April 26, 2009, 16:57

hallo, louisgag
according to me, GGI is already much better on this than Sliding Interface.
while in Sliding Interface, I always observe this problem.
How many faces have you used on the interface? and deltaT is how much?

Regards.

louisgag · April 26, 2009, 17:41

Hi Yuhai,

I used 200 faces on my interface (it is 2D) and the resolution is similar to my boundary layer resolution. As for deltaT, i let it vary with a max courant number of 0.5. (So, deltaT is roughly 1e-05

ty for the feedback,

-Louis

rieuk · May 31, 2010, 06:44

I also had a similar problem with the solution at the interface. I had a spatial discontinuity though, no spikes or anything. It looked as if the solution on the outside (static part of the mesh) was lagging (in time) slightly compared to the inside.

Anyone else notice this?

louisgag · June 8, 2010, 15:10

Hi James.

I did have a similar problem at times; however, I did not investigate on the cause.

Best regards,

-Louis

A.Devesa · July 13, 2010, 09:46

i guess this could be related to this one: http://www.cfd-online.com/Forums/ope...-postcalc.html

i hope this helps!

April 24, 2009, 20:33	GGI Vorticity	#1
louisgag Senior Member Louis Gagnon Join Date: Mar 2009 Location: Stuttgart, Germany Posts: 338 Rep Power: 18	Hi Foamers, I'm using the latest svn with a GGI interface and I noticed that when I run the vorticity tool on the case and then visualize in paraFoam, the vorticty at the interface is really weird (high values all along the interface), for almost all my runs.. However, the flow field around the interface is fine in terms of pressure, velocity, and vorticty... Could that be an issue with the vorticity tool when used with GGI? Thanks for your feedback, -Louis

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April 26, 2009, 16:57		#2
yuhai Member Hai Yu Join Date: Mar 2009 Location: Harbin Posts: 67 Rep Power: 17	hallo, louisgag according to me, GGI is already much better on this than Sliding Interface. while in Sliding Interface, I always observe this problem. How many faces have you used on the interface? and deltaT is how much? Regards.

April 26, 2009, 17:41		#3
louisgag Senior Member Louis Gagnon Join Date: Mar 2009 Location: Stuttgart, Germany Posts: 338 Rep Power: 18	Hi Yuhai, I used 200 faces on my interface (it is 2D) and the resolution is similar to my boundary layer resolution. As for deltaT, i let it vary with a max courant number of 0.5. (So, deltaT is roughly 1e-05 ty for the feedback, -Louis

May 31, 2010, 06:44		#4
rieuk Senior Member Pavan Join Date: May 2009 Location: Melbourne Posts: 101 Rep Power: 17	I also had a similar problem with the solution at the interface. I had a spatial discontinuity though, no spikes or anything. It looked as if the solution on the outside (static part of the mesh) was lagging (in time) slightly compared to the inside. Anyone else notice this?

June 8, 2010, 15:10		#5
louisgag Senior Member Louis Gagnon Join Date: Mar 2009 Location: Stuttgart, Germany Posts: 338 Rep Power: 18	Hi James. I did have a similar problem at times; however, I did not investigate on the cause. Best regards, -Louis

July 13, 2010, 09:46		#6
A.Devesa Member Antoine Devesa Join Date: Mar 2010 Posts: 36 Rep Power: 16	i guess this could be related to this one: http://www.cfd-online.com/Forums/ope...-postcalc.html i hope this helps!