Change Solver
I changed the Solver from 2D to Axisymmetric in FLUENT and kept all other items same. But after the Grid Check,there is a WARNING message: Grid check failed. The relative information as following:
Grid Check Domain Extents: xcoordinate: min (m) = 0.000000e+00, max (m) = 5.000000e02 ycoordinate: min (m) = 0.000000e+00, max (m) = 3.500000e01 Volume statistics: minimum volume (m3): 6.732661e12 maximum volume (m3): 8.213853e06 total volume (m3): 6.383493e03 minimum 2d volume (m3): 1.953960e10 maximum 2d volume (m3): 4.264212e06 Face area statistics: WARNING: nonpositive face area exist. I am puzzled that it is a 2D problem, why the volume figures shown? 
Re: Change Solver
When using axisymmetry in Fluent, the axis of rotation has to be on the xaxis. You may correct this inside Fluent with the grid>translate option.
Regards. 
Re: Change Solver
3ks a lot, I will try.

Re: Change Solver
3ks a lot , but if i change the model in GAMBIT , then do i need "translate"?

Re: Change Solver
i changed the model in Gambit(rotation 90), to make it on the Xasix,but the Grid Check failed: Grid Check
Domain Extents: xcoordinate: min (m) = 0.000000e+00, max (m) = 3.500000e+01 ycoordinate: min (m) = 5.000000e+00, max (m) = 2.143061e15 Volume statistics: WARNING: nonpositive volumes exist. minimum volume (m3): 5.015160e01 maximum volume (m3): 1.984904e04 total volume (m3): 1.044429e+03 minimum 2d volume (m3): 3.960858e04 maximum 2d volume (m3): 4.154485e02 Face area statistics: minimum face area (m2): 1.458132e03 maximum face area (m2): 1.026326e+00 This time, the volume figures are negetive. Thanks a lot! 
Re: Change Solver
Using other mesh types in gambit maybe work.

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