An Experimental and Numerical Comparison of Turbulent Flow Over a Step
Abstract
An experimental investigation was made of air flow in a four inch square duct over a single four inch high rearward-facing step. The Reynolds number based on step height was 1.68 x 100,000 and the boundary layer approaching the step was turbulent. The pressure coefficient (Cp) distribution was found to be in relatively good agreement with similar measurements published in the literature. A laser Doppler velocimeter was used to measure an ensemble of 4500 individual velocities at angles of 0 deg, + 30 deg, and -30 deg to the duct axis from which the following mean velocities and turbulence parameters at 180 points in the flow field were derived. The results, in general, compare favorably with those found in the literature. A two-dimensional numerical prediction of the flow field was made using the k approx epsilon turbulence model. The comparison with the experimental results illustrates the three-dimensionality of the flow.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1980
- Accession Number
- ADA097141
Entities
People
- H. Doyle Thompson
- Robin J. Bremmer
- W. H. Stevenson
Organizations
- Purdue University