[Markua]

Good Afternoon fellas,

I should start out by saying I'm pretty new to Ansys itself and my knowledge is going to be a bit unfulfilling, but I have put about 50 hours into learning the program so far and have searched up the errors I'm about to ask about with little-to-no luck.

So, I'm trying to generate a mesh for a 2D airfoil for CFX (I will learn Fluent after I'm happy with my knowledge in this program) that will be tested over angles of attack 0-20.

I have done this test once and the data I got was acceptable, but I wanted to increase all of the meshing to about twice as fine and re run the test to determine how much accuracy is sacrificed/gained as mesh decreases/increases in quality. This is where the program starts getting finicky.

I found that the mesh, which was failing very often, would work more often with a less fine inflation layer around the profile. I could somewhat deal with this. I suppose the computer just couldn't work it out, although it did not seem to me to be half as complex as any other mesh I've ever seen.

Now this problem becomes much more annoying when I set my computer to analyze 21 different design points (the angles of attack) and when I come back to the computer, I find that 3-4 points have failed and require a lower intensity inflation, so I need to set all design points to the lowest common denominator which decreases the quality of all of the other design points that would have been able to handle the better inflation. So that's problem number one.

Problem number two, I noticed when I was looking through the down-force generated by each angle, and I saw two or three that didn't quite seem right. Checking these specific point's mesh showed that the inflation layer didn't generate at all. No error, no warning, but no inflation layer. This is dangerous, as I can't check that each angle has properly developed an inflation layer, and ANSYS won't tell me, I'm going to eventually give someone wrong data and waste someones time (read: my own).

So my setup has a lower refinement rectangle, with a high refinement rectangle inside that, and the 2D aerofoil inside that (well, it's all extruded 1mm anyway). The rectangles both have face sizing and a sweep to go the 1mm back, and the wing profile has an edge sizing and an inflation.

I'm going to try include images of the lower quality mesh working, the higher quality mesh failing, and a set of inflation setting that works for 16/21 of the design points.

If anyone can give me more information on this, I'd be very grateful.





e: Can't see the images uploaded on my end. Try these links:
http://imgur.com/pMNV0fY
http://imgur.com/INSuKHQ
http://imgur.com/eLhC63M