[ANSYS Meshing] C or O domain for airfoil analysis?

lmg2e09 · October 27, 2012, 17:01

I am a user of Fluent and CFX tough I have a question..
Do you think (also if possible with references) using a O or a C (an in the tutorials) domain to analyse a 2D airfoil??

Thanks

Far · October 27, 2012, 17:05

If you have sharp trailing edge then C type otherwise O-type

AleAle · October 31, 2012, 10:14

Can I ask you why the C-mesh is better than the O-mesh in a airfoil with a sharp edge? which are the advantages?

Thank you!!

blackmask · November 8, 2012, 23:28

For O-type grid, the sum of two angles adjacent to the trailing edge is (360-a), where a is the trailing edge angle which is usually very small. Each angle is approximately (180-a/2) which is close to 180. Thus the edge staring from the trailing edge should parallel to the wall (C-type) rather than than perpendicular to the wall (O-type). For blunt trailing edge, "a" is around 90 so that O-type grid can be used.

October 27, 2012, 17:01	C or O domain for airfoil analysis?	#1
lmg2e09 New Member laura marimon Join Date: Oct 2012 Posts: 2 Rep Power: 0	I am a user of Fluent and CFX tough I have a question.. Do you think (also if possible with references) using a O or a C (an in the tutorials) domain to analyse a 2D airfoil?? Thanks

October 27, 2012, 17:05		#2
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	If you have sharp trailing edge then C type otherwise O-type PSYMN, cfd seeker, energy382 and 1 others like this.

November 8, 2012, 23:28		#4
blackmask Senior Member Join Date: Aug 2011 Posts: 421 Blog Entries: 1 Rep Power: 21	For O-type grid, the sum of two angles adjacent to the trailing edge is (360-a), where a is the trailing edge angle which is usually very small. Each angle is approximately (180-a/2) which is close to 180. Thus the edge staring from the trailing edge should parallel to the wall (C-type) rather than than perpendicular to the wall (O-type). For blunt trailing edge, "a" is around 90 so that O-type grid can be used. cfd seeker, cesarcg and Xuck like this.

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October 31, 2012, 10:14		#3
AleAle New Member Alessandra Join Date: Oct 2012 Posts: 1 Rep Power: 0	Can I ask you why the C-mesh is better than the O-mesh in a airfoil with a sharp edge? which are the advantages? Thank you!!