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how to export the coordinate value of interface?

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Old   March 18, 2004, 04:37
Default how to export the coordinate value of interface?
  #1
Ryan
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I am now using unsteady VOF method to compute the free surface flow (air and liquid). I have obtained the contours of these two phases at different time. But I was confused that I could not obtain the coordinate value of the interface. Does anyone know how to obtain them?
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Old   March 18, 2004, 08:13
Default Re: how to export the coordinate value of interfac
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mateus
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Ups I posted the answer to the wrong question - here is the solution (again)- i hope

Hi!

What you should do is: go to "surface-iso surface". Then set surface of constant density - set iso values to desired density for example 500kg/m^3 if you have water air problem. This defines a line of cnstant density (the line of interface). Chose the name for the surface, for example denity500 and click create.

To get the coordinates go to "plot-xy plot". Deselect "position on x axis". set "Y axis function to grid - y coordinate" and "x axis function to grid x coordinate. Select "density500" at surfaces. If you want to get the numerical values (instead of plot) select "write to file"..

Hope this helps...

MATEUS

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Old   March 18, 2004, 08:53
Default Re: how to export the coordinate value of interfac
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Ryan
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Thank you very much, MATEUS. What you said helps me a lot. One thing I can not understand is why the density is set to 500 kg/m3, not other values for water air problem.
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Old   March 18, 2004, 10:11
Default Re: how to export the coordinate value of interfac
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mateus
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Hi!

Well that's aproximatelly the mean density value (0.5*(rho_water+rho_air)). Since Vof uses a mixture fluid approach you get more or less steap density gradient at the interface. So the middle value should determine its mean position (it's about the same if you use contour plot with only 2 levels). If your simulation is good there should't be much difference if you chose other value anyway.

Best regards

MATEUS
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Old   March 18, 2004, 21:40
Default Re: how to export the coordinate value of interfac
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Ryan
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I see. You are so kind, MATEUS. Many thanks to you.

Best regards

Ryan
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