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Vehicle aerodynamics result interpretation

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Old   April 29, 2015, 03:49
Default Vehicle aerodynamics result interpretation
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daru
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Hello,
I have been recently working on vehicle aerodynamics. To start off, I ran an analysis on the Ahmed body and got accurate results.

Having applied the same procedure to more complex geometry (read solar car)
I seem to have gotten erroneous results.
  • Max skewness 0.92
  • Body of influence - one around the car, a finer one in the wake
  • Pressure based steady state solver
  • Energy off, Realizable k-eps, non-eq wall fns
  • Solution method - coupled
  • Under-relaxation factors - default

I used hybrid initialization. Solution converged in under 500 iterations.

The issue is, when I plotted the velocity contours on my symmetry plane I got this (pl. refer velocity_mag.jpg)

So, I wonder what's wrong and how to interpret this result.

Thank you
An inexperienced, undergraduate CFD enthusiast.
Attached Images
File Type: jpg velocity_mag.jpg (26.6 KB, 19 views)
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Old   March 9, 2019, 03:54
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Umang Srivastava
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Quote:
Originally Posted by daru View Post
Hello,
I have been recently working on vehicle aerodynamics. To start off, I ran an analysis on the Ahmed body and got accurate results.

Having applied the same procedure to more complex geometry (read solar car)
I seem to have gotten erroneous results.
  • Max skewness 0.92
  • Body of influence - one around the car, a finer one in the wake
  • Pressure based steady state solver
  • Energy off, Realizable k-eps, non-eq wall fns
  • Solution method - coupled
  • Under-relaxation factors - default

I used hybrid initialization. Solution converged in under 500 iterations.

The issue is, when I plotted the velocity contours on my symmetry plane I got this (pl. refer velocity_mag.jpg)

So, I wonder what's wrong and how to interpret this result.

Thank you
An inexperienced, undergraduate CFD enthusiast.
Hello Daru,

Seems, you are doing post processing in parallel mode.

Try to do the post processing in serial mode and have a look on plot.
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ahmed body, drag coefficient, results, turbulence, vehicle aerodynamics

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