Segregated or coupled?
Hi All, I'm solving a steady 3d axial flow turbine problem using standard keps model. The balde is filmcooled by 3 cooling holes; fluid is rotatind at 314rad/s (399m/s in the middle) and the higher Ma is 0.88. The problem is that in the compressible simulation the segregated solver diverges for any relax factor, so I have too use the coupled solvet that takes a lot of time ( I have 500.000 nodes). Is it possible to use the segregated solver or the problem prevent this? Thankyou all.

Re: Segregated or coupled?
(1). All I know is, for subsonic flow it is better to use pressurebased formulation. (2). Since your problem is in the transonic range, the right approach is the densitybased transient formulation. I am somewhat confused with their new names of algorithm. (3). So, ths suggestion is: use the densitybased transient formulation. Based on my previous experience, it may take more than a couple of weeks to converge using compressible, transient formulation. But, that is life. (4). Even if you can obtain the solution ,500,000 nodes may not be adequate at all for mesh independent solution.

Re: Segregated or coupled?
Dear Pierluigi Allegro
In Fluent, coupled solver means 'algorithm for compressible flow'. It is better for you to use 'coupled solver' because compressible effect can't be neglected for your problem, Mach Number =0.88. In general, as you may know, the flow is considered as compressible when Ma>0.3. Sincerely, Jinwook 
All times are GMT 4. The time now is 14:51. 