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-   -   In Post-First blending function for BSL and SST (http://www.cfd-online.com/Forums/cfx/23128-post-first-blending-function-bsl-sst.html)

anna October 1, 2006 16:54

In Post-First blending function for BSL and SST
 
Dear all,

what can I expect if I plot "First blending function for BSL and SST model" or "Second blending function for BSL and SST "in contour or if I calculate it in Function calculator, both in Postproc? Thanks a lot in advance.

Joe October 1, 2006 21:54

Re: In Post-First blending function for BSL and SS
 
This is all covered in the manual section on the SST model.

Far September 24, 2011 19:27

I am having the strange problem with SST model.

As we know that: Different values of first blending function F1 for BSL and SST model are:

1 = KW model
0 = K epsilon model
between 0 and 1 = mixture of both models with appropriate portion of each model depending on the values of F1

1. But what I am getting is alternate values of 0 and 1, which means that KW and KE model are switching on and off again and again. As I believe there should be the continues decrease in value of F1 from 1 (in viscous sub layer, KW model) to the 0 ( in the log layer, or it is the outer most layer !!!!, KE model).

2. Is this due to use of automatic wall treatment?

I shall be very much thankful for your useful discussion

PS. I am solving the NASA rotor 37, and looking for these values at the 50% span as to avoid any confusion with the effect of wall (hub or casing). Although same trend is observed at all locations.


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