منابع مشابه
Numerical Simulation of Scaling Effect on Bubble Dynamics in a Turbulent Flow around a Hydrofoil
A Lagrangian-Eulerian numerical scheme for the investigation of bubble motion in turbulent flow is developed. The flow is analyzed in the Eulerian reference frame while the bubble motion is simulated in the Lagrangian one. Finite volume scheme is used, and SIMPLEC algorithm is utilized for the pressure and velocity linkage. The Reynolds stresses are modeled by the RSTM model of Launder. Upwind ...
متن کاملTurbulent Spot/Separation Bubble Interactions in a Spatially Evolving Supersonic Boundary-Layer Flow
The growth and breakdown of localised disturbances into a turbulent spot in a Mach 2 boundary-layer flow have been investigated by direct numerical simulation. In particular, the interaction of a turbulent spot with a shock-induced separation bubble is studied. The primary vortex structures triggered by the injected low momentum fluid and the metamorphosis of the hairpin structures into a turbu...
متن کاملBubble breakup in a turbulent shear layer
The breakup of a millimetre size buoyantly rising bubble encountering a horizontal plane turbulent jet is experimentally investigated using high-speed shadowgraphy and acoustic techniques. The bubble diameter to jet height ratio is 0.75 and the jet height based Reynolds number is 4000. The high-speed imaging was recorded at 7 kHz simultaneous with hydrophone output at 100 kHz. Bubble breakup ev...
متن کاملActive Control of a Laminar Separation Bubble
In the present paper an active control mechanism for the control of laminar separation bubbles on airfoils is investigated by means of direct numerical simulation and linear stability theory. Boundary layer instabilities excited by periodic oscillations are utilized to control the size and length of the separation bubble and to make it finally disappear when desired. Unlike traditional vortex g...
متن کاملNumerical simulation of a turbulent hydraulic jump: Characterization of the free interface and large bubble structure
Bubble generation is a ubiquitous and complex phenomenon occurring as a result of non-linear behavior of the free surfaces. Plunging breakers, spilling breakers and plunging jets are just a few scenarios where bubble generation occurs. Due to its complexity and our lack of complete understanding of this phenomenon, the models developed in the literature are far from being predictive (Moraga et ...
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ژورنال
عنوان ژورنال: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
سال: 1984
ISSN: 0387-5016,1884-8346
DOI: 10.1299/kikaib.50.1483