Modelling combustion (3D VS 2D)

christophe

Hi,

I've already sent a mail about a trouble to model a propergol combustion in a chamber.

I mean I modeled this case with a pressure inlet BC. First, I had a mesh which gave me a straight temperature evolution along the revolution axis of the pressure inlet BC section.

Then, I tried to model in a 2D case with a 2d axisymetric case. I reached the same results (no really decreasing of temperature gases along the axis (the pressure inlet BC section is 0.050 m diameter, and I do not have temperature decreasing 20 m away from the inlet BC !.

But I was not satisfied of this results, that is why I modeled a new 3D case with a better size function, and here I got a decrease at 2,50 m from the inlet.

I do believe the last modelling results are better, but someone could give me his feeling about this...(realistic phenomenum, not able to reproduce a 2D case...)

Many thanks

Christophe