[tjwldhks79]

Would simulating a clear laminar phenomenon with a turbulence model yield inaccurate results?

My speculation is that since turbulence doesn't occur in clear stratification, applying a turbulence model wouldn't be appropriate for the calculations...

I'm curious about this.

Thanks

[sbaffini]

Originally Posted by tjwldhks79

Would simulating a clear laminar phenomenon with a turbulence model yield inaccurate results?

My speculation is that since turbulence doesn't occur in clear stratification, applying a turbulence model wouldn't be appropriate for the calculations...

I'm curious about this.

Thanks

Yes, it would yield inaccurate results... unless the model initial and boundary conditions are such that the model is, indeed, inactive (say, resulting turbulent viscosity much lower than physical viscosity in every cell)

[FMDenaro]

Originally Posted by tjwldhks79

Would simulating a clear laminar phenomenon with a turbulence model yield inaccurate results?

My speculation is that since turbulence doesn't occur in clear stratification, applying a turbulence model wouldn't be appropriate for the calculations...

I'm curious about this.

Thanks

In LES formulation, the dynamic SGS model is able to solve also laminar regime.
RANS formulations produce wrong solutions in general.

However, there is no reason to “model” laminar flows.

[starab]

A turbulent model adds stresses related to turbulent viscosity additionally to stresses dependent on natural fluid viscosity. If the turbulent stresses are negligible you approach to laminar behavior. Regarding OF, one needs to investigate, what laminar stress model the specific turbulent model adjusts.