Hydraulic diameter and turbulence parameter

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lehongduc
Posts: 23
Joined: Thu Aug 20, 2015 3:05 pm

Hydraulic diameter and turbulence parameter

Post by lehongduc »

Hello,

I have a newbie question about the hydraulic diameter that we choose for the turbulence parameter of the Inlet. I'm using CSv4.0 to simulate a gas flow exiting a pipeline into the air. I use k-epsilon model for the gas turbulence. I can give the initial value for the k and epsilon or I can also choose the option: Turbulence calculated by hydraulic diameter and choose the hydraulic diameter value. In my case, I don't know my initial value of k and epsilon so maybe I prefer to choose the default hydraulic diameter. My question is : how CS calculates the initial value of k and epsilon from the hydraulic diameter? If not, how CS use the hydraulic diameter to initialize the k - epsilon model?

Thanks in advance,
Regard,
Hong Duc
Luciano Garelli
Posts: 243
Joined: Fri Dec 04, 2015 1:42 pm

Re: Hydraulic diameter and turbulence parameter

Post by Luciano Garelli »

Hello,

You can check these documentation about k-e initial values. Here is explained how it is computed and its implementation.

https://www.code-saturne.org/doxygen/sr ... _diam.html

https://www.code-saturne.org/doxygen/sr ... bc_8c.html

Regards,

Luciano
lehongduc
Posts: 23
Joined: Thu Aug 20, 2015 3:05 pm

Re: Hydraulic diameter and turbulence parameter

Post by lehongduc »

Hello,

Thanks a lot for the explanation. :)

Regard,
Hong Duc
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