The following is a readme file describing the tabulated data for flow in a 30 degree bend.  The

experiment was performed in a low speed recirculating water channel in the thermosciences

laboratory at Stanford University by Karen A. Flack and James P. Johnston.  The data was

obtained at nine measurement stations on the end wall of a 30 degree bend, with stations upstream

of the bend, every 6 degrees within the bend, and downstream of the bend in a straight recovery

section. Details of the experiment can be found in:



Flack, K.A. and Johnston, J.P., (1993) "Near-wall investigation of three-dimensional turbulent

boundary layers," Thermosciences Division,  Stanford University, Stanford CA, Report MD-63.



Copies of the report may be obtained from the first author.

Professor Karen A. Flack

Department of Mechanical Engineering

United States Naval Academy

Annapolis, MD 21402-5042

(410)293-6500

flack@usna.navy.mil



Professor James P. Johnston

Department of Mechanical Engineering

Stanford University

Stanford, CA 94305-3030

(415)723-4024

johnston@stokes.standford.edu



Tabulated data from the experiment is given in ten text files.  The first file, bend.txt, lists the flow

conditions and parameters for the nine measurement locations. The data is given in standard SI

units (m, m/s, C) and all angles are given in degrees. The columns for the flow conditions and

flow parameters (bend.txt) are:

file name, bend location, water temperature, freestream velocity, delta99, freestream turning

angle, momentum thickness Reynolds number, wall shear stress, shear velocity, wall turning angle,

and skin friction coefficient.



The nine measurement stations are: 0.254 m upstream of the start of curvature, 0 degrees, 6

degrees, 12, degrees, 18 degrees, 24 degrees, 30 degrees, 0.127 cm downstream, and 0.254 cm

downstream.  The final two stations are in a straight recovery section, downstream of the end of

curvature at 30 degrees. All data is referenced to a right hand coordinate system based on the

upstream tunnel coordinates (before the bend), where x (u) is the streamwise direction, y (v) is the

wall normal direction and z (w) is the spanwise direction.  The values for the spanwise component

of velocity (w) are negative since the curvature is in the negative z direction.  Mean velocities are

denoted by U, V, and W, and fluctuating velocities are denoted by u, v, and w. The columns for

the tabulated data (bend1.txt - bend9.txt) are as follows:

y, U, V, W, u, v, w, uv, uw, vw, uuu, vvv, www, uuv, uuw, vvu, vvw, wwu, wwv, uvw, uuuu,

vvvv, wwww.