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-   -   pipe boundary (http://www.cfd-online.com/Forums/openfoam/80419-pipe-boundary.html)

nygbook September 24, 2010 22:55

pipe boundary
 
Hello, everyone. I want to compute the flow of pipe as show in the picture below by pisoFoam, which include small inlet1 of 1.2m/s, big inlet2 of 0.5m/s and one outlet. Now I have two question. First how should I set the value of k and epsilon at wall boundary. Second what are nutilda and R in 0 file when using pisoFoam and how should I initialize them.

http://img.ph.126.net/22rpK8LJC2uYQ0...4928931835.jpg

deniggo September 26, 2010 06:23

Hi,
I can not see any picture. However, take a look at the CFD-Wiki, the calculation of k and epsilon is explained there: http://www.cfd-online.com/Wiki/Turbu...ary_conditions

For a first try, set bc like in the piso or other ras tutorials.

Good luck,

Nico

nygbook September 27, 2010 05:21

Quote:

Originally Posted by deniggo (Post 276658)
Hi,
I can not see any picture. However, take a look at the CFD-Wiki, the calculation of k and epsilon is explained there: http://www.cfd-online.com/Wiki/Turbu...ary_conditions

For a first try, set bc like in the piso or other ras tutorials.

Good luck,

Nico

Thanks for your reply! Yesterday I have resolved the problem using simpleFoam with BC of fixed k and epsilon value. :) Then I will try to resolve the problem using other RAS solver.


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