What is u^+?(a) The ratio of velocity parallel to the wall to the friction velocity(b) The ratio of the friction velocity to velocity parallel to the wall(c) The ratio of free-stream velocity and friction velocity(d) The ratio of friction velocity and free-stream velocityThe question was asked in an online quiz.My question is based upon Turbulent Boundary Layer topic in division Turbulence Modelling of Computational Fluid Dynamics

What is u^+?(a) The ratio of velocity parallel to the wall to the fric

1.	What is u^+?(a) The ratio of velocity parallel to the wall to the friction velocity(b) The ratio of the friction velocity to velocity parallel to the wall(c) The ratio of free-stream velocity and friction velocity(d) The ratio of friction velocity and free-stream velocityThe question was asked in an online quiz.My question is based upon Turbulent Boundary Layer topic in division Turbulence Modelling of Computational Fluid Dynamics
Answer» The CORRECT choice is (a) The RATIO of velocity parallel to the wall to the friction velocity Explanation: u^+ is the dimensionless velocity. It is DEFINED as the ratio of the velocity of fluid particle parallel to the wall at a particular distance from the wall to the friction velocity. Friction velocity is the square root of the ratio of shear stress to the density of fluid.

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