[tsram90]

I am doing a analysis of a An IC engine with Hydrogen and diesel pilot injection.
When I try to do the mesh motion in fluent I am getting negative volume error. I am getting results when using a normal flat piston but my work is of a piston with a hemisphere in center.
Can someone do a mesh file and gambit file for me? (2D). I think the error is due to problems in meshing and I tried various types of meshing but its not working out.

I am using Gambit 2.2.30, Fluent 6.2.16

Engine Specs:
Stroke 110 mm
Bore 80 mm
Clearance volume: 2mm gap and a semi circle with 25 mm radius in center

Origin (0,0) At top of cylinder in center, No need of valves, need a diesel injector at center.

Thank you.