the mesh for the inlet
 

I want to provide the velocity profiles which got from measurments into the fluent, can anyone please tell me if the mesh for the inlet is important? For me, i have a semi-ciurcular inlet and it's hard to get a good quality mesh.

I am looking forward to your reply!
Thanks!

For better quality control use gridgen, it will give you superb mesh quality.

The mesh quanlity has great effects on the simulation resutls. For inner flow problem tried to use a butterfly type grid. the grid lines are nearly orthogonal to the boundary. at the axis of the pipe, singular point problem is avoided.