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Old   November 11, 2008, 07:34
Default how to show shock waves
  #1
anne
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I am predicting the external flow around airfoil with high mach number (>0.8), in which cases shock is supposed to occur. I am just wondering how can I identify it and how to show it in my results. thanks a lot. anne
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Old   November 11, 2008, 10:39
Default Re: how to show shock waves
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J
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Just plot the pression distribution...if your mesh is fine enough you will see the shock as a sudden change in pressure...
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Old   November 11, 2008, 13:08
Default Re: how to show shock waves
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anne
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thanks,

do you mean just pressure or total pressure. I think total pressure seems more reasonable, what's your opinion. anne
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Old   November 11, 2008, 14:15
Default Re: how to show shock waves
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J
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Depends on what you want...for example if you want to show the non-isentropic behaviour and then the loss of total pressure plot this one... Everything depends on what you need to show...
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Old   November 12, 2008, 05:25
Default Re: how to show shock waves
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Timon
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A numerical Schlieren image is also nice. Plot contours of d(rho)/dx and use an inverse grayscale colormap (tweak the range to show the shock nicely).
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Old   November 12, 2008, 16:50
Default Re: how to show shock waves
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CycLone
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This is the pressure gradient which can also be output to the res file. I can't recall if it is output by default (I think it is), but if it isn't you can enable output of variable operators from the output control panel in CFX-Pre. This will make you shock waves should show up nicely.

You can also create isosurfaces of Mach Number equal to one.

-CycLone
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Old   November 13, 2008, 07:32
Default Re: how to show shock waves
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anne
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thank you all so much. I am trying your ways. anne
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