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LES about BC cyclic and turbulence

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Old   October 6, 2014, 12:10
Default LES about BC cyclic and turbulence
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Jason Tan
Join Date: Sep 2014
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I'm ready to use LES to simulation a duct square turbulence in OF,inlet and outlet are cyclic , but there's something about BC cyclic and turbulence bother me .

Question 1:cyclic BC.
I manually set a cyclic BC wiyhout use any utility, but I saw the OF2.1/channelFoam/0.org/U ,the inlet and the outlet are divided into half,it's like inlet_half0、inlet_half1 and outlet_half0、outlet_half1 ,antbody could tell me ,why does it need divided into half,should I use any utility like createPatch or something to set cyclic ??How could I do that ?

Question 2:turbulence

Some page told me use the utility perturbU to create turbulence ,I compiled it correctly ,and use it in OF2.1.1,there are two questions I'm not clear
1.I used perturbU ,and it just created a new "U",but I saw the channelFoam,it created a new "0"folder ,the "k" "nusgs" "p" "U" became a new one ,original "0" became "0.org".why I use perturbU ,it just created a new "U" without a new "k" "nusgs" "p" ???
2.the "U" file just change the streamdirection value ,but in the channelFoam/0/U,all direction value changed ,why ??
or I should use other utility to create turbulence ??

anybody help me ?
best wishes .
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