...Jiajia Li; Pablo M. Carrica We propose a method to visualize vortex cores based on manipulation of the pressure field produced by isolated vortices in incompressible flow. Under ideal conditions, the function D = 2 | ∇ p | / ∇ 2 p yields an approximate distance to vortex centerlines. As opposed...

... “rolling vortices” by Giron et al. [ 14 ], are clearly unsteady as they seem to travel from wave inlet to wave outlet by rolling on the surface of the plates. Because these small rolling features appear just before the breaking of the recirculation on downstream troughs, Giron et al. [ 14 ] hypothesized...

... with the contour of normalized pressure To visualize coherent structures in the flow, the Lambda-2 ( λ 2 ) vortex criterion is calculated from an instantaneous flow field [ 32 ]. Figure 23 shows the motion of the vortices when λ 2 is −1.0 × 10 6 s −2 , and on these isosurfaces, the normalized...

...; distribution is unlimited. Use license CC-BY 4.0. 09 11 2017 18 05 2018 Drag Experimental techniques Flows in biological systems Fluid-structure interaction Hydrodynamics Measurement techniques Naval hydrodynamics Unsteady flows Vortices Wakes Fluid mechanics...

... is 163.93 Hz, and the cavitation shedding frequency at the short side is 306.67 Hz, which is about twice the value of the former. The filtered vorticity transport equation is employed to investigate the cavitation–vortex–turbulence interaction. Results indicate that vortex stretching is the major promoter...

.... Assoc. Editor: Sergio Pirozzoli. 26 09 2017 28 05 2018 Boundary layers Computational fluid dynamics RANS simulations Rotating fluids Turbulence Turbulence modeling Unsteady flows Vortices Wakes Boundary layer flows over three-dimensional (3D) curved bodies...

... LUIDS E NGINEERING . Manuscript received September 7, 2017; final manuscript received June 1, 2018; published online June 29, 2018. Assoc. Editor: Bart van Esch. 07 09 2017 01 06 2018 Cavitation Jets LES Multiphase flows Vortices Two-stage electrohydraulic servovalves...

... as the distribution of the tangential velocity on different axial positions, have been specifically captured and analyzed. The “strake,” “claw,” and “ivory” vortices have been newly found and defined at the initial evolution stage, and they subsequently begin to harshly wind and rotate with the primary vortex. A flow...

... then fold into vortices and under favorable flow condition may lead to the formation of cavitating bubbles in the vortices' cores. The vortices shed downstream where the recovered pressure is sufficiently high to collapse the vapor pockets and generate pressure waves. These pressure waves propagate both...

... configuration. Particle image velocimetry (PIV) measurements of the constructive interference cases show strong synchronized vorticity shedding in all cavities. Each cavity contribution to the total aeroacoustic source is then examined by means of Howe's analogy, and the percentage contribution of each cavity...

...Sabine Bonitz; Lars Larsson; Lennart Löfdahl; Simone Sebben The flow around passenger cars is characterized by many different separation structures, typically leading to vortices and areas of reversed flow. The flow phenomena in these patches show a strong interaction and the evolution of flow...

... with strong shed vortices. 1 Corresponding author. Contributed by the Fluids Engineering Division of ASME for publication in the J OURNAL OF F LUIDS E NGINEERING . Manuscript received January 4, 2017; final manuscript received April 3, 2018; published online May 28, 2018. Assoc. Editor: Samuel...

... with rotating stall in SNL conditions. The results offer evidence that the rotating stall is in fact associated with an unstable vorticity distribution not associated with the runner blades themselves. where L represents a turbulence length scale and L υK the von Kármán length scale calculated from...

... of the triangular jets, swirling strength analysis was performed. This analysis provides information on the location of vortices, their induced rotational motion and strength, and is fully explained in Ref. [ 26 ]. In this analysis, first the interrogation areas (IAs) with nonzero rotational (swirling) motion were...

... to the collective interaction mechanism causes many smaller higher frequency vortices (from the shear layer mode) to roll up into one large vortex. An instantaneous image of this collective interaction phenomenon can be seen in a flow visualization study by Kopiev et al. [ 11 ]. This synchronization of the upstream...

... of this overflow rinsing methodology is that some of the processing fluid stagnates due to the generated vortices in the regions between the side and middle lifters which entrap some of the flushed particles that further adhere and deteriorate the surface of the wafers. In this work, the hydrodynamics of the flow...

... -vorticity isosurfaces suggest an almost instant transition from the 2D shear layer to 3D structures, which are predominant around the LEV. At this pitch angle, the flow over the upper surface is dominated by flow reversal whose interaction with the freestream velocity above results in strong velocity shear...

... coefficient by vortex formation and the vertical force fluctuations by waves. In contrast, the temporal evolution of vorticity fluctuations revealed that in-phase at high St e amplified the lock-on responses of C L ( r m s ) ′ . The fluctuations of the lift coefficient were decoupled...

...  = vorticity (1/s) ω * = dimensionless vorticity ( b 0 ω / U s 0 ) The authors would like to thank Mr. Koji Okuda of Software Cradle Co., Ltd. for his help with the numerical simulation and Mr. Hiroaki Terakado of Kogakuin University for his help in conducting...

... studies depict the flow physics at each section along with the study of helicity at the exit of inlet pipe to determine the recirculation effects. It is observed that the vortices associated with the motion of the particles are moved toward the surfaces and are more intense than the mean flow. The trends...