compressor proublem,

Sastry

hai frds,

i am doing a high speed compressor proublem its running at 37000 rpm,and pr ratio of 3.5 app.,

1-i started with constant density acc to my inlet conditions,and afeter 1000 iterations,i changed to ideal gas to air,after some iterations, i am getting blunder results 2-i started the speed with 5000 rpm,and ps2 also given less,every 300 iterations i am incresing spped, and ps2 little bit up to mu design spped asd pressre pls help me in this case, how can i get good results,how can i converge the solution with out errors