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Forum: CFX

August 14, 2014, 18:28

Replies: 7

supersonic (Laval) nozzle, unphysical Mach number

Views: 2,040

Posted By ghorrocks

If you think the Mach wave artefact is from your...

If you think the Mach wave artefact is from your grid then simply changing the grid (significantly finer preferably, but coarser will probably work too) will show whether you are right. If the...

Forum: CFX

August 14, 2014, 06:43

Replies: 7

supersonic (Laval) nozzle, unphysical Mach number

Views: 2,040

Posted By ghorrocks

You have a sharp transition from the expansion...

You have a sharp transition from the expansion section to the straight duct. This will create a Mach wave - and that is what you see. This is not a viscous effect, it is a compressibility effect. So...

Forum: CFX

August 13, 2014, 18:53

Replies: 7

supersonic (Laval) nozzle, unphysical Mach number

Views: 2,040

Posted By ghorrocks

I do not understand your problem. Your results...

I do not understand your problem. Your results look believeable to me - you are close to your expected Mach 1.7 and superimposed on that you have some Mach wave reflections. This is all as expected.

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