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-   -   INTRODUCE A MACRO FOR AVOID SMEARING IN VOF in ccm+ (http://www.cfd-online.com/Forums/star-ccm/73304-introduce-macro-avoid-smearing-vof-ccm.html)

lupoigloo March 4, 2010 05:09

INTRODUCE A MACRO FOR AVOID SMEARING IN VOF in ccm+
 
" The numerical accuracy of the VOF method depends highly on the
interface resolution. To prevent the solution from becoming too smearing due to numerical diffusion, a compression procedure is developed to perform VOF interface rescaling such that the average thickness within the interface (0.1 < alfa < 0.9) is kept constant through out the computation. The interface et
solution compression procedure is expressed as:

alfa_new
= Max{0, Min[ 1, 0.5+ f(alfa_old-0.5)]}

and
f= (Interface Thickness)_new / (Interface Thickness)_initial "
by Yen-Sen Chen, Huan-Min Shang and Paul Liaw Engineering Sciences, Inc. Huntsville, AL 35802


I wonder if it's possible to implemet and how it is possible to write a routine to do that in CCM+

Thank you very much


frogotron March 11, 2010 11:52

Smearing
 
Hi

The VOF scheme in STAR-CCM+ uses the HRIC (high resolution interface capturing scheme), by its nature it shouldnt smear the interface unless perhaps you are running with very large timesteps.

Have a look at the online help & search for HRIC


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