Flow Separation in GE frame 9 Compressor CFD simulation
 

Has anybody simulated GE frame 9 Compressor? I had simulated this 17th stages compressor with the CFX; when I used a coarse mesh with y+=30 and k-w turbulence model, there is no problem in convergence and everything in CFD-POST is fine. But when it comes to simulating with a fine mesh, y+=1 and SST turbulence model; Inlet mass decreases and post-process show a big region of flow separation near the leading edge close to the hub. Can anybody give me any tips?:confused:

Typically, certain flow effects are not captured on coarse mesh. They are smeared over the cell volume. Separation at the hub is a problem. Try to eliminate/isolate the problem and simulate the stage with different boundary conditions (reduce discharge pressure, or mass for example). See if the separation is still present.

Frankly, I do not have experience with that particular frame.

CFDpal