... likely separation at high diffuser angles or low ride heights. Third, stronger streamwise vortices along the edges of the underfloor and diffuser, which generate downforce directly due to their low-pressure cores, but also introduce upwash under the model, further inhibiting separation in the diffuser...

... 2023 01 02 2024 12 04 2024 vertical-axis wind turbines bioinspiration aerodynamics hydrodynamics lift drag vortices Table 5 Optimization of Fibonacci-1 bladed turbine Optimization of Fibonacci-1 bladed turbine Design variables Sr...

...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...

... on the capabilities of the numerical models to simulate real egg-carton plates as the ones experimentally investigated by Giron et al. [ 14 ]. The procedure followed by this research work was as follows: The unsteady flow features, called “rolling vortices” by Giron et al. [ 14 ], are clearly unsteady...

.... 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...

... Vortices Two-stage electrohydraulic servovalves play important roles in most modern hydraulic servocontrol systems for flight wing controls, manufacturing robots, automobiles, and so on. The light weight, compactness, and fast dynamic response of two-stage servovalves significantly attract...

... 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...

... 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...

... field downstream of the pillar as reported by Belahadji et al. [ 23 ] and Ramamurthy and Balanchandar [ 33 ]. They identified three types of cavitating vortices: near-wake vortices, the primary two-dimensional Kármán vortices, and secondary three-dimensional streamwise vortices. In addition, three...

... 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. References [1] REN21 , 2016 , “ Renewables 2016 Global Status Report ,” Renewable Energy Policy...

... 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...

...  < 1.5) as a function of downstream z / W distance for all test cases Phase-locked vorticity fields are obtained by taking the curl of the velocity data obtained by the PIV. Each phase of the velocity fields consisted of an ensemble average of 200 vector fields. The laser and camera were...

... 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...

... dynamics Fluid-structure interaction Hydrodynamics LES Vortices Wind and tidal turbines work under highly turbulent conditions and are subjected to a large range of velocities and turbulence intensities compromising their survivability, specifically from a structural integrity and a service...

..., 2018. Assoc. Editor: Riccardo Mereu. 25 07 2017 02 01 2018 Free surface flows Lift Vortices Wakes Waves Flow past a circular cylinder close to a free surface has been studied in many applications of pipelines, offshore structures, and tidal power plants. The existence...