SketchUp 3D model import to Gambit or Fluent
 

Looking for advise as to simplest method to translate SketchUp 3D model into format that Fluent or Gambit CFD software can import. According to Gambit the following file formats can be imported: FIDAP, GAMBIT, I-DEAS UNV, ANSYS, NASTRAN, PATRAN, PLOT3D FORMATTED,FLUENT4, FLUENT5, TGRID, STL, HYPERMESH. My SketchUp Pro 3D software can export into the following file formats: 3D DWG or DXF, 3D FBX, 3D XSI, 3D OBJ, 3D VRML, 3D 3DS, STL. The common denominator between these two software programs appears to be and STL file but I am having some difficulty importing the STL into Gambit. Also STL format does not appear to have enough 3D information. Has anyone tried this transfer between SketchUp and Gambit or Fluent before with any success? Any advise would help. Steve