oscillations 1D3D coupling GT-Power/StarCD

Hubert Janocha

When I couple the 1D Software GT-Power with StarCD sometimes I get very high oscillations at the interface volumen of GT and Star. I already have testet many ideas, but I still have not found an overall reproduceable error to avoid this oczillations. Some ideas / tricks helps, but not enough.

The application is a intake manifold calculation for normal asperated or turbo charged combustion engines.

It is strange, because this oscillations occur in that time steps when the pressure gradients are very low (means: in that time when the intake valve is cllosed). When the intake valve opens I get a very good high quality devolution / distribution of mass and velocities.

I hope strongle anybody is out there with an advice.