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Keywords: turbulent boundary layer
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Proceedings Papers

Proc. ASME. FEDSM2021, Volume 3: Fluid Mechanics; Micro and Nano Fluid Dynamics; Multiphase Flow, V003T05A029, August 10–12, 2021
Paper No: FEDSM2021-65593
...Abstract Abstract In the present study, the effects of wall proximity on the wake dynamics behind a square cylinder subjected to a thick upstream turbulent boundary layer were experimentally investigated using particle image velocimetry. The Reynolds number based on the free-stream velocity...
Proceedings Papers

Proc. ASME. FEDSM2020, Volume 2: Fluid Mechanics; Multiphase Flows, V002T03A020, July 13–15, 2020
Paper No: FEDSM2020-20457
... In this paper, we use a CFD analysis of a simplified, 2D geometry to study the ability of mako shark denticles to mitigate flow separation. We represent the viscous sublayer below a turbulent boundary layer streak as a Couette flow. Incipient separation is simulated by balancing upper wall velocity and adverse...
Proceedings Papers

Proc. ASME. FEDSM2020, Volume 2: Fluid Mechanics; Multiphase Flows, V002T03A024, July 13–15, 2020
Paper No: FEDSM2020-20317
...Abstract Abstract The current study explores the influence of polymer drag reduction on the near-wall velocity distribution in a turbulent boundary layer. The classical view is that the polymers modify the intercept constant within the log-region without impacting the von Kármán coefficient...
Proceedings Papers

Proc. ASME. FEDSM2020, Volume 2: Fluid Mechanics; Multiphase Flows, V002T04A022, July 13–15, 2020
Paper No: FEDSM2020-20293
...Abstract Abstract Large-eddy simulations (LES) of incompressible turbulent boundary-layer flows can simulate a fundamental unsteady turbulent flow, including time-variant streamwise and wall-normal velocity as well as the near-wall locations of significant turbulence intensities. A typical...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 5: Multiphase Flow, V005T05A001, July 28–August 1, 2019
Paper No: AJKFluids2019-4647
...Abstract Abstract How microbubbles behave inside turbulent boundary layers are investigated experimentally. Water electrolysis is applied for generation of microbubbles in water, of which electrodes are flash mounted on the solid wall in the upstream section of the measurement area. Four kinds...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 5: Multiphase Flow, V005T05A046, July 28–August 1, 2019
Paper No: AJKFluids2019-5272
...Abstract Abstract To investigate the development process of a void wave, spatio-temporal fluctuation of void fraction, we examined experimentally a turbulent boundary layer with bubble injections. The experiments performed on a flat bottom of 4-mlong transparent model ship towed in a tank...
Proceedings Papers

Proc. ASME. AJKFluids2019, Volume 5: Multiphase Flow, V005T05A048, July 28–August 1, 2019
Paper No: AJKFluids2019-5457
... potential to reduce ship drag. Keywords: Ship drag reduction, Air bubbles, Hydrofoil, Turbulent boundary layer 1 Contact author: ichiro.kumagai@meisei-u.ac.jp NOMENCLATURE angle of attack [deg.] kinematic viscosity of water [m2/s] density of water [kg/m3] P negative pressure generated by hydrofoil...
Proceedings Papers

Proc. ASME. FEDSM2007, Volume 1: Symposia, Parts A and B, 247-255, July 30–August 2, 2007
Paper No: FEDSM2007-37042
...turbulent boundary layer, which is a typical external Proceedings of FEDSM2007 5th Joint ASME/JSME Fluids Engineering Conference July 30-August 2, 2007 San Diego, California USA the mean velocity scaled by the friction velocity in- creases with increasing the amount of drag reduction...
Proceedings Papers

Proc. ASME. FEDSM2007, Volume 2: Fora, Parts A and B, 633-638, July 30–August 2, 2007
Paper No: FEDSM2007-37592
... to document the effect of the cavity on the flow in the presence of adverse pressure gradient. Turbulent boundary layer cavity particle image velocimetry adverse pressure gradient diverging channel p si b in th b S g p re in re tr o (R w Proceedings of FEDSM2007 5th Joint ASME/JSME Fluids...
Proceedings Papers

Proc. ASME. FEDSM2006, Volume 1: Symposia, Parts A and B, 1585-1594, July 17–20, 2006
Paper No: FEDSM2006-98569
... turbulent boundary layer the polymer flow rate per unit span of the injection Proceedings of FEDSM2006 2006 ASME Joint U.S. - European Fluids Engineering Summer Meeting where large polymer DR occurs. In the current work, a confocal-style laser induced fluorescence based probe was developed and used...