Can you specify an approximate range for "turbulent intensity" in river streams? Do you have any related experience in modeling river flows?
(I want to use k-epsilon model available in Ansys-Fluent)
If Reynolds no is very low you can treat it as laminar flow, otherwise
Well,
Article Effect of Reynolds number, near-wall perturbation and turbul...
Article Turbulence in Rivers
Regards
If Reynolds no is very low you can treat it as laminar flow, otherwise
Thank you Vivek kumar Patel for your assistance.
In the river stream that I am studying, generally we do not have laminar flows.
I appreciate you for giving me a value for the turbulent intensity (1 %), therefore I can try it in my numerical model, at least as a starting value.
Do you have any suggestions when we have a flooding event in the river? Could you also specify an approximate range for floods as well?
Thanks.
https://www.cfd-online.com/Wiki/Turbulence_intensity
https://www.afs.enea.it/project/neptunius/docs/fluent/html/ug/node238.htm
If you can go through this links I think you will have some idea , turbulence depends on a number of factors, like flow variations, swirling, change of direction etc. You should consider these. Please ignore if you find irrelevancy.
' Thanks.
It depends on the condition of the river. If it is wide and deep enough and not too steep, then the turbulence intensity will be as low as 1%.
Thank you Nazaruddin Sinaga ,
Do you have also any suggestions when we have a flooding event in the river?
"Do you have also any suggestions when we have a flooding event in the river? "
What did you mean, please?
@Nazaruddin Sinaga,
I mean when we have a flooding event in the river (for example a flash flood), I think the river flow have a larger "turbulent intensity" comparing to the normal conditions. Do you have any suggestions for "turbulent intensity" range in such conditions (an approximate range)?
Let me ask the question in another way: Does a flooding event affect the "turbulent intensity" much, comparing to the normal flow conditions? Does it have significant effects on the turbulent intensity?
Thanks dear Nima Khaledy ,
Please check the definition of Turbulence Intensity. So, its blue depends on the fluctuating velocity and the free-stream velocity. The higher the fluctuating velocity the higher its TI....
So if the flooding flow is rather regular (its fluctuating velocity is low), then the TI will be low too.
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