[supermanks]

Hello all,

I'm using ANSYS-14 and currently working on a mixing tank (with baffles) problem. However, I am encountering the issue of bad mesh quality (with min. orthogonal quality around 0.03-0.04 and average around 0.9). The mesh was swept automatically, and all I did was apply inflation for near-wall regions. The mesh looks fine (with hex cells), though and I would like to know if a low value of min. orthogonal factor is something of great concern, or if it is acceptable as long as the average value is high(close to 1). If it is not acceptable, could you please tell me how it can be improved?

Also, once I clearly name the impeller fluid region and the exterior fluid region (the one outside the rotating frame) in meshing, fluent seems to identify these "zones", and hence, three surfaces starting with the word "interior" appear when I click on "mesh display" in fluent. Also, in boundary conditions, I'm unable to change these zone types to "interface". So, does this "interior" naming mean that fluent has recognized the interface regions, and will create the interface automatically? Or am I mistaken and there's a manual way to do it?

Also, I used the RNG k-epsilon model and after setting up the solution and running the calculation, the solution started to diverge, and I had to cancel it. But the same thing for an unbaffled tank worked, where I had a min. orthogonal quality of about 0.2, and I got a proper solution.

So I really need some help regarding the above three points, please do provide your inputs ! Thanks a lot !