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nutUSpaldingWallFunction - Implementation

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Old   July 20, 2013, 08:07
Default nutUSpaldingWallFunction - Implementation
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Hello everyone,

I am trying to find out how the nutUSpaldingWallFunction ist implemented. Can anybody explain what is done in the correction term df please?


scalar f =
- ut*y[faceI]/nuw[faceI]
+ magUp[faceI]/ut
+ 1/E_*(fkUu - 1.0/6.0*kUu*sqr(kUu));

scalar df =
y[faceI]/nuw[faceI]
+ magUp[faceI]/sqr(ut)
+ 1/E_*kUu*fkUu/ut;

scalar uTauNew = ut + f/df;


Thanks
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Old   February 23, 2017, 05:46
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I just found this thread by accident. It is actually the iterative procedure to calculate the friction velocity using Newton - Raphson method:
https://en.wikipedia.org/wiki/Newton's_method
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