Aerofoil CFD enquiry

cfdlboro · May 5, 2011, 10:36

Hello everyone,

I am running simulations on Star CMM+ on a few different aerofoils. I have attached a file showing the poly mesh I have, can anyone tell me what is going on with the mesh immediately around the aerofoil and if so why?

Thanks in advance,

cfdlboro

abdul099 · May 7, 2011, 04:28

That's a miracle! I've never seen somebody being able to create a mesh like this!

Okay, let's stay serious. What about your other airfoils? Does it alway look like this? Is this view a cutting plane or the view on a boundary? What about prism layers, do you have some?

I'm not sure due to the missing information, but when your view shows a wall with prism layers, the mesher will have some problems on the concave edge between this wall and the airfoil boundary. Try switching the wall to a symmetry plane and check the mesh again. It might give you better results anyway, as most airfoils doesn't have a perpendicular wall directly attached (except a plane fuselage).

rwryne · May 9, 2011, 11:14

Can you give a picture of the mesh a bit closer to one of the "tumors"?

Is this a cutplane or a boundary you are showing? I have found little graphical hiccups like those spots on volume mesh cutplanes, but they are usually not that...consistent around the boundaries.

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May 7, 2011, 04:28		#2
abdul099 Senior Member Join Date: Oct 2009 Location: Germany Posts: 636 Rep Power: 21	That's a miracle! I've never seen somebody being able to create a mesh like this! Okay, let's stay serious. What about your other airfoils? Does it alway look like this? Is this view a cutting plane or the view on a boundary? What about prism layers, do you have some? I'm not sure due to the missing information, but when your view shows a wall with prism layers, the mesher will have some problems on the concave edge between this wall and the airfoil boundary. Try switching the wall to a symmetry plane and check the mesh again. It might give you better results anyway, as most airfoils doesn't have a perpendicular wall directly attached (except a plane fuselage).

May 9, 2011, 11:14		#3
rwryne Senior Member Ryne Whitehill Join Date: Aug 2009 Posts: 312 Rep Power: 18	Can you give a picture of the mesh a bit closer to one of the "tumors"? Is this a cutplane or a boundary you are showing? I have found little graphical hiccups like those spots on volume mesh cutplanes, but they are usually not that...consistent around the boundaries.