ESM4714:
Sources of Scientific Data Sets

Comments on Mixing Layer Data

Reference:
S.A. Ragab and S. Sheen, Numerical Simulation of a Compressible Mixing Layer", AIAA No. 90-1669, AIAA 21st Fluid DYnamics, Plasma Dynamics and Lasers Conference, June 1990.
Problem Statement:
Numerical simulation of supersonic mixing was accomplished by Dr. Saad Ragab on a Cray-II coputer. Results were stored in the file named "dens.dat". The data is a collection of 90 sequential frames taken at evenly spaced time increments which can be used to create a time animation of the mixing phenomena.

Each frame is a collection of 501 vertical and 129 horizontal node points in an evenly-spaced mesh (node coordinates can be eliminated in this case). The vertical boundaries are periodic in the horizontal direction, hence, the animated movie shown on the 8mm tape has been duplicated in the horizontal direction where the vertical center line represents a common boundary. The final frame size is 501 by 258.

Visual Insight:
With the larger frame size, we can more clearly see the reflected shock from the lower boundary. In the same animation we can also see that the shock wave does not originate from poor numerical approximations of the boundary conditions but is the result of an expansion fan formation from a vortice that develops in the mixing layer with time.

Click image to return to Visualization home page.
Ronald D. Kriz
Virginia Tech
College of Engineering
Revised 03/14/95

http://www.sv.vt.edu/classes/ESM4714/data_sets/ragab/ragab_s.html