code_saturne User's Forum

Hello,

Thank you for your answers.

Actually, this is not really a new model but just an adjustment of the standard k-epsilon apparently more adapted for atmospherical flows.

After searching a bit more, I found that the \sigma_k and \sigma_{\varepsilon} constants of the k-{\varepsilon} are defined ...

Hello Louis,

Thank you for your response.

I have checked this document, which if I'm not mistaken refers to the cs_turbulence.c file I was talking about, but it doesn't mention the sigma_k and sigma_e constants.
I think the two sigma constants should indeed appear in both standard and linearized k ...

Hello,

For a study about the flow and dispersion around a building, I would like to see the influence of the modifications of the k-epsilon (or k-epsilon linar production) model constants as shown in few articles that i found. The five constants are : C_\mu , C_{\varepsilon1} , C_{\varepsilon2 ...

Hello,

Thank you both for your responses.

Yvan, I'm indeed in a high-Reynolds case study.
As I understand it, the y_+ calculated by code_saturne on a rough surface has to be higher than a y_{limit}^+ value around 2, which I think allow to ensure that the calculation point at the center of the ...

Hello Yvan,

Thank you for your response.

I've checked the clptrg file, and apparently for rough walls it is computed as : y_+\equiv\frac{y_p}{y_0} (where y_p is the distance from the centre of the wall-adjacent cell to the wall, and y_0 is the aerodynamic roughness length). This explain why I had ...

Hello,

Does anyone knows how exactly is calculated the y+ on a rough wall (on code_saturne v8.0) ?

I have searched in the theory guide ( https://www.code-saturne.org/documentation/8.0/theory.pdf p.58-60) but the rough wall part doesn't really answer this question.

The thing is, when I'm looking ...

Hi Sean,

Thank you for your response.

I have already tested the sliding wall condition, which indeed modified the value of the calculated wall shear stress compared to my initial calculation, but the main issue still remained : it wasn't constant along my calculation domain. I suppose it is ...

Hello,

I'm currently working on Atmospheric Boundary Layer simulation on code_saturne v8.0, and especially on horizontal homogenity (i.e. conservation of speed and turbulence profiles along an empty computational domain).

Based on some articles that I found, it is recommanded to apply a constant ...