Stepwise increase in the Strouhal number for flows around flat plates

✍ Scribed by Shigehira Ozono; Yuji Ohya; Yasuharu Nakamura; Ryuzo Nakayama

• Publisher: John Wiley and Sons
• Year: 1992
• Tongue: English
• Weight: 591 KB
• Volume: 15
• Category: Article
• ISSN: 0271-2091
• DOI: 10.1002/fld.1650150908

✦ Synopsis

The unsteady viscous flow around flat plates with square leading and trailing edges is investigated by using a finite difference computation of the incompressible two-dimensional Navier-Stokes equations. The chordto-thickness ratio of a plate ranges from d/h = 3 to 9, with a Reynolds number based on the plate's thickness equal to lo3. The numerical analysis confirms the finding obtained in our previous experiment that vortex shedding from flat plates with square leading and trailing edges is caused by the impinging shear layer instability. The Strouhal number based on the plate's chord increases stepwise with increasing d/h in accordance with the experiment. The numerical analysis also gives some crucial information on the complicated vortical flow occurring near the trailing edge. Finally, the mechanism of the impinging shear layer instability is discussed in the light of the experimental and numerical findings.