The discussion centers around the concept of turbulent viscosity, its definition, and how it differs from ordinary viscosity. Participants explore the implications of flow conditions, such as laminar and turbulent flow, on viscosity and turbulent viscosity, with references to turbulence modeling and the Navier-Stokes equations.
Participants express uncertainty about the relationship between flow conditions and viscosity, with some suggesting that turbulent conditions affect viscosity differently than laminar conditions. The discussion remains unresolved regarding the implications of these differences.
There are references to specific terms and concepts such as Reynolds stress and turbulence modeling, which may require further clarification for those unfamiliar with fluid dynamics. The discussion also highlights a lack of consensus on how flow conditions impact viscosity.
Beats me. Exactly where did you come across this term? BTW, it's "viscosity".lingesh said:whats turbulent viscocity?How it different from viscocity?
It is.Also i read that viscocity is fluid property.
Just the opposite.So has flow condition like laminar or turbulent has any effect on viscocity?
My senior doing CFD Analysis of a rain water filter..In the report she has given this plot of turbulence viscosity..I don't understand how its different from visosity?SteamKing said:Beats me. Exactly where did you come across this term? BTW, it's "viscosity".It is.Just the opposite.
Keep reading about viscosity.
To add to what Boneh3ad said, unlike the ordinary viscosity, the turbulent viscosity is not a physical property of the fluid. It depends on the intensity of the turbulent fluctuations in the fluid (i.e., the flow).boneh3ad said:Turbulent viscosity, or eddy viscosity, arises in the field of turbulence modeling. When you start with the Navier-Stokes equations and perform what is typically called Reynolds averaging, you get a new equation describing the mean velocity profile of a turbulent flow. This new equation looks identical to the standard Navier-Stokes equations except for the addition of a new term with the units of stress, typically called the Reynolds stress.
The Reynolds stresses essentially represent the effect of velocity fluctuations, and therefore turbulent mixing, on the stress in the flow. Boussinesq proposed modeling the Reynolds stress with a new viscosity term that takes the same form as the normal viscous term in the equation so that the Reynolds stress term would be replaced by something a little more intuitive like a new viscosity coefficient that could be combined with the more usual viscosity.