The rate of dissipation of kinematic eddy viscosity parameter is Cw1ρ\((\frac{\tilde{ν}}{κy})^2 f_w\). What is the length scale used here?(a) κy(b) (κy)^2(c) \(\frac{C_{w1}}{y}\)(d) \(\frac{y}{C_{w1}} \)This question was posed to me by my school principal while I was bunking the class.The doubt is from Turbulence Modelling topic in chapter Turbulence Modelling of Computational Fluid Dynamics

The rate of dissipation of kinematic eddy viscosity parameter is Cw1ρ

1.	The rate of dissipation of kinematic eddy viscosity parameter is Cw1ρ\((\frac{\tilde{ν}}{κy})^2 f_w\). What is the length scale used here?(a) κy(b) (κy)^2(c) \(\frac{C_{w1}}{y}\)(d) \(\frac{y}{C_{w1}} \)This question was posed to me by my school principal while I was bunking the class.The doubt is from Turbulence Modelling topic in chapter Turbulence Modelling of Computational Fluid Dynamics
Answer» The correct CHOICE is (a) κy To ELABORATE: The LENGTH scale cannot be computed in the Spalart-Allmaras model. It must be specified separately. The length scale used here is κy. Where, κ is the von Karman’s CONSTANT which is equal to 0.4187 and y is the distance from the wall.

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