An experimental and numerical study of the flow around a blunt rectangular section  A test case for computational methods?
Abstract
An experimental and numerical study was conducted on a region of flow separation occurring near a blunt rectangular section placed at zero incidence in a uniform lowturbulence stream, using conventional hotwire anemometers, pulsed wire anemometers, and pulsed wire surface shear stress probes to measure the flow fields. Numerical predictions of the mean flow field were made using a finite difference method and a modified version of the TEACH code. Two discretization schemes were used, based on hybrid differencing (HD) and bounded skewed HD (BSHD). It is shown that significant errors in the values of the reattachment length, X(R), can occur through false diffusion, when predicting the mean flow field. On the other hand, results obtained using the BSHD scheme gave good agreement in laminar flow cases; it is assumed that, with this scheme, most of the false diffusion problems are eliminated. For turbulent flows, however, the conventional kepsilon model of turbulence used with the BSHD scheme gave values of the X(R) about 30 percent above the measured values.
 Publication:

6th Symposium on Turbulent Shear Flows
 Pub Date:
 1987
 Bibcode:
 1987stsf.proc...19D
 Keywords:

 Blunt Bodies;
 Computational Fluid Dynamics;
 Flow Distribution;
 Turbulent Flow;
 Finite Difference Theory;
 HotWire Anemometers;
 KEpsilon Turbulence Model;
 Laminar Flow;
 Reynolds Number;
 Vortex Shedding;
 Fluid Mechanics and Heat Transfer