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-   -   troubleshooting tips (http://www.cfd-online.com/Forums/star-ccm/115611-troubleshooting-tips.html)

freddyk April 3, 2013 06:27

troubleshooting tips
 
I am running a drag and lift prediction for flow over an ahmed body and Star-CCM+ consistently gives me under predicted values by around 20%. I have tried changing turbulence models and refining the mesh in the wake but neither helped. My question - what are some basic steps I can take to diagnose the problem?

freddyk April 8, 2013 11:06

still need help
 
I have provided these images if they can be of use determining my issues.

Wall Y+

http://s22.postimg.org/eze8y3ptd/yplus.png

Centreline Velocity Magnitude

http://s24.postimg.org/4g38bycn9/velmag.png

Velocity Magnitude from a different piece of software (correct!)

http://s24.postimg.org/yjhr3wfwl/expected_flow.png

Streamlines from Literature

http://s24.postimg.org/ar8fsddvp/expected_2.png


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