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Backward-facing step measurements at low Reynolds number, Re(sub h)=5000An experimental study of the flow over a backward-facing step at low Reynolds number was performed for the purpose of validating a direct numerical simulation (DNS) which was performed by the Stanford/NASA Center for Turbulence Research. Previous experimental data on back step flows were conducted at Reynolds numbers and/or expansion ratios which were significantly different from that of the DNS. The geometry of the experiment and the simulation were duplicated precisely, in an effort to perform a rigorous validation of the DNS. The Reynolds number used in the DNS was Re(sub h)=5100 based on step height, h. This was the maximum possible Reynolds number that could be economically simulated. The boundary layer thickness, d, was approximately 1.0 h in the simulation and the expansion ratio was 1.2. The Reynolds number based on the momentum thickness, Re(sub theta), upstream of the step was 610. All of these parameters were matched experimentally. Experimental results are presented in the form of tables, graphs and a floppy disk (for easy access to the data). An LDV instrument was used to measure mean velocity components and three Reynolds stresses components. In addition, surface pressure and skin friction coefficients were measured. LDV measurements were acquired in a measuring domain which included the recirculating flow region.
Document ID
19940028784
Document Type
Technical Memorandum (TM)
Authors
Jovic, Srba (Eloret Corp. Palo Alto, CA., United States)
Driver, David M. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 6, 2013
Publication Date
February 1, 1994
Subject Category
FLUID MECHANICS AND HEAT TRANSFER
Report/Patent Number
NASA-TM-108807
A-94043
NAS 1.15:108807
Funding Number(s)
PROJECT: RTOP 505-59-50
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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