Physics – Classical Physics
Scientific paper
2006-07-11
Physics of Fluids 18, num. 5 (2006) Art. 055104
Physics
Classical Physics
16 pages
Scientific paper
10.1063/1.2204049
A three-dimensional (3D) direct numerical simulation is combined with a laboratory study to describe the turbulent flow in an enclosed annular rotor-stator cavity characterized by a large aspect ratio G=(b-a)/h=18.32 and a small radius ratio a/b=0.152, where a and b are the inner and outer radii of the rotating disk and h is the interdisk spacing. The rotation rate Omega under consideration is equivalent to the rotational Reynolds number Re=Omegab2/nu=9.5 x 104, where nu is the kinematic viscosity of the fluid. This corresponds to a value at which an experiment carried out at the laboratory has shown that the stator boundary layer is turbulent, whereas the rotor boundary layer is still laminar. Comparisons of the 3D computed solution with velocity measurements have given good agreement for the mean and turbulent fields. The results enhance evidence of weak turbulence at this Reynolds number, by comparing the turbulence properties with available data in the literature. An approximately self-similar boundary layer behavior is observed along the stator side. The reduction of the structural parameter a1 under the typical value 0.15 and the variation in the wall-normal direction of the different characteristic angles show that this boundary layer is three-dimensional. A quadrant analysis of conditionally averaged velocities is performed to identify the contributions of different events (ejections and sweeps) on the Reynolds shear stress producing vortical structures. The asymmetries observed in the conditionally averaged quadrant analysis are dominated by Reynolds stress-producing events in this B\"{o}dewadt layer. Moreover, case 1 vortices (with a positive wall induced velocity) are found to be the major source of generation of special strong events, in agreement with the conclusions of Lygren and Andersson.
Poncet Sébastien
Randriamampianina Anthony
No associations
LandOfFree
Turbulence characteristics of the Bödewadt layer in a large enclosed rotor-stator system does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Turbulence characteristics of the Bödewadt layer in a large enclosed rotor-stator system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Turbulence characteristics of the Bödewadt layer in a large enclosed rotor-stator system will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-138470