Mach contour

  • Last Post 08 March 2019
  • Topic Is Solved
elm565 posted this 28 February 2019

Good evening evreyone,

I am new to Ansys Workbench and fluent, and I have a hard time trying to simulate flow in a supersonic air intake.

I'd like to see if there's a shockwave but I didn't manage to find how to display Mach number's contour.

Is that possible in the student version or is there something i'm doing wrong?

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abenhadj posted this 28 February 2019

You are definitely making something wrong . Are you working with compressible air? If yes you will probably find Mach number under velocity related category.

Best regards,


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kkanade posted this 01 March 2019

this may help you


elm565 posted this 08 March 2019


Problem has been solved.

Thanks for the answer abenhadj, this was part of what I've done wrong. First I forgot to set "ideal gas" next to density. Thanks to that I can know display Mach contour.

But even with that there was no shockwave in my intake. Other problem was the mesh beeing too small. Setting the mesh size 10x bigger allowed my computer to run the solution a lot faster and show the shockwave.

I'm not yet sure why smaller mesh prevent the calculus to converge.

abenhadj posted this 08 March 2019

Smaller mesh requires smaller time scales to resolve shock waves as well as you are now resolving spatially more (even things which are appropriate for the deployed models). please create new thread for any follow up questions. 

Best regards,