Heat transfer through a pipe..

Hi frns,
I am facing a strange problem in solving the heat transfer through a meatal pipe. i have completed all the steps boundary conditions are done, meshing is done. The only problem which i am facing is with the solver. It a turbulent problem gas moving inside the pipe with a velocity of 85 m/s, so i am solving it with K-epsilon. When i am startin the solver its just keep on going with out givin any results, its not even showing any error. I dont know what to do. Pls help me with this guys.

I will be very thnakful to you for any kind of help.

Thanks & Regards,

Anil Jaswal