... shedding. Aerodynamics Compressible flows Drag Free shear layers Gas dynamics Supersonic flows Transonic flows Unsteady flows Wakes The authors would like to express their sincere gratitude to A. Narayanaswami, V. Biju, and A. Narayana for their unstinted support during the model...

...Hawwa Falih Kadum; Devin Knowles; Raúl Bayoán Cal Conditional statistics are employed in analyzing wake recovery and Reynolds shear stress (RSS) and flux directional out of plane component preference. Examination of vertical kinetic energy entrainment through describing and quantifying...

... filaments (0 < Re < 5) to flapping fins (Re > 20) with an intermediate range of Reynolds number (5 < Re < 20) where both types are present in the same swimming animal. Analysis suggests that these unsteady surfaces are mechanical oscillators coupled to their nonlinear wakes. A low-friction...

... fluid dynamics RANS simulations Rotating fluids Turbulence Turbulence modeling Unsteady flows Vortices Wakes Boundary layer flows over three-dimensional (3D) curved bodies such as an axisymmetric hill are of interest to the computational fluid dynamics (CFD) community due...

... in ground proximity with obstacle, so we chose one fixed height of the obstacle case (h 0 = 0.5b 0 ) to investigate, and the obstacle is placed transversally to the axis of the primary wake to be analyzed. The trajectories of the primary wake-vortex cores and the circulation profiles, as well...

... accompanied by bubble shedding, and an abrupt attached cavity without bubble shedding. For single and twin circular pillars, intermittent bubbles shed from the pillars into the wake region and collapsed once reaching a high pressure region downstream. Fig. 6 Cavitation inception modes for ( a ) single...

... to the velocity gradient, the sequence of the vortex street changes. It also has significant effect on the formation and composition of hovering vortex. To capture these features, each vortex is tracked as they form, detach, and move in the wake of the cylinder. Hovering vortex, formed due to coalescing...

... . Manuscript received August 18, 2017; final manuscript received May 2, 2018; published online June 13, 2018. Assoc. Editor: Jun Chen. 18 08 2017 02 05 2018 Aerodynamics Computational fluid dynamics Drag Turbulence Turbulence modeling Wakes Partially‐averaged Navier–Stokes...

... Flow Phenomena ,” Annu. Rev. Fluid Mech. , 4 ( 1 ), pp. 313 – 340 . 10.1146/annurev.fl.04.010172.001525 [2] Williamson , C. H. K. , 1996 , “ Vortex Dynamics in the Cylinder Wake ,” Annu. Rev. Fluid Mech. , 28 ( 1 ), pp. 477 – 539 . 10.1146/annurev.fl.28.010196.002401 [3...

... flexibility effects on impulse are more important at the largest Reynolds numbers. The impulsive performance of the system is derived from direct thrust force measurements. Passive flexibility alters vortex strength and formation in the wake of the pitching foil. These changes in the wake formation can...

... the wake propeller and to predict the instability processes in the wake if it exists. Two Reynolds-averaged Navier–Stokes (RANS) models are used: the k–ω shear stress transport (SST) of Menter and an anisotropic two-equation explicit algebraic Reynolds stress model (EARSM). A hybrid RANS–large eddy...

...Robert Jaron; Antoine Moreau; Sébastien Guérin; Rainer Schnell A major source of contra-rotating open rotor (CROR) tonal noise is caused by the interaction of the front-rotor (FR) wakes with the aft-rotor blades. Inspired by chevron nozzles, which increase the mixing process in jet shear layers...

... wake (LLFVW) code was recently integrated into the open source wind turbine simulation suite qblade . This paper describes some of the necessary adaptions of the algorithm, which differentiates it from the usual application in HAWT simulations. A focus is set on achieving a high robustness...

...Matthieu Boudreau; Guy Dumas An analysis of the vortex dynamics in the wake of three different freestream turbine concepts is conducted to gain a better understanding of the main processes affecting the energy recovery in their wakes. The turbine technologies considered are the axial-flow turbine...

... Computational fluid dynamics Experimental techniques Hydrodynamics Measurement techniques Pressure drop Pumps Rotating fluids Turbulence modeling Unsteady flows Vortices Wakes Fluid mechanics Turbomachines Hydropower plays a vital role to maintain stable and uninterrupted operation...

... that the variation of stability is attributed to the different spatial variation trends of the backflow velocity in the near- and far-wake regions for various cylinder geometries. The results from the stability analysis are also verified with those of the direct simulations, and very good agreement is achieved...

... January 20, 2016; final manuscript received April 3, 2017; published online June 28, 2017. Assoc. Editor: Mark F. Tachie. 20 01 2016 03 04 2017 Drag Duct Pressure drop Vortices Wakes Channel Pipe flows Short pin-fins with H / D  ≤ 4 in channel flows promote local...

... bodies which strongly depend on the evolution of the vortex shedding. The frequency of vortex detachment for flow past cylinder problems can be modified when the cylinder moves, promoting the modification of the wake of vortices. Synchronization phenomena appear when the frequencies of the resulting flow...

...Gokturk Memduh Ozkan; Erhan Firat; Huseyin Akilli The control of flow in the wake of a circular cylinder by an attached permeable plate having various porosity ratios was analyzed experimentally using both particle image velocimetry (PIV) and dye visualization techniques. The force measurements...

... and a clustering technique allowed us to gain insight into the physical mechanisms involved in these phenomena. This highlights that the symmetrical forcing of the wake flow at its resonant frequency with the TED promotes symmetrical vorticity patterns which favor drag reductions. 1 Corresponding author...