High-fidelity numerical simulation of unsteady cavitating flow around a hydrofoil

Journal of Hydrodynamics, Journal Year: 2023, Volume and Issue: 35(1), P. 1 - 16

Published: Feb. 1, 2023

Language: Английский

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Numerical simulation and experimental study of jet breakup using a water dispersal needle in irrigation sprinklers

Biosystems Engineering, Journal Year: 2024, Volume and Issue: 239, P. 49 - 67

Published: Feb. 15, 2024

Language: Английский

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The role of normal and non-normal contributions to enstrophy production in the near-wall region of a turbulent channel flow

Journal of Fluid Mechanics, Journal Year: 2025, Volume and Issue: 1006

Published: March 4, 2025

The turbulent boundary layer is a region where both preferential dissipation of energy and the production significant vorticity arises as consequence strong velocity gradients. Previous work has shown that, following Reynolds decomposition, purely fluctuating component enstrophy dominant term. Near wall this varies in complex manner with height. In study, we additionally decompose strain rate terms into normal non-normal components using Schur decomposition are able to explain all these features contributions at different heights from constituents involving combinations quantities. What surprising about our results while mean shear action larger-scale structures should that effects over-riding importance wall, most important individual term involves transverse direction. part, because correlation between axis, but it also case negative mean. Hence, local orthogonal direction plays crucial role amplifying yet have developed component. These conclusions support emphasis control literature on wall.

Language: Английский

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Non-normality and small-scale statistics in a three-dimensional, separated shear flow

Journal of Fluid Mechanics, Journal Year: 2025, Volume and Issue: 1010

Published: May 9, 2025

We analyse the small-scale characteristics, such as enstrophy, total strain and normality/non-normality, in three-dimensional, separated flow around a NACA 0018 wing using direct numerical simulations. The angle of attack is $10^\circ$ Reynolds number (based on chord length) $Re_c=5000$ . role non-normality investigated by performing Schur decomposition velocity gradient tensor. also apply to derive new expressions for production enstrophy arising from mean inhomogeneity. focus two sections flow, across recirculating zone along transitioning shear layer, compare our results with homogeneous isotropic turbulence (HIT). Within region, index approximately 0 (and close HIT value), indicating almost equal normal non-normal contributions. However, separating layer effects strongly dominate, especially region kinetic energy growth. Only decay do values gradually approximate values. due vortex stretching dominated mixed (interaction) term, where stretches vorticity. same component dominates self-amplification term. contributions different QR regions terms are examined. Production rate triggered upstream compared fluctuating fields.

Language: Английский

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Wall-modeled large eddy simulation for the flows around an axisymmetric body of revolution

Journal of Hydrodynamics, Journal Year: 2023, Volume and Issue: 35(2), P. 199 - 209

Published: April 1, 2023

Language: Английский

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Numerical analyses of water swirls in aquaculture tanks

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(7)

Published: July 1, 2024

Water swirls were observed in both model and prototype aquaculture tanks with bottom drains. This phenomenon was seldom replicated studies of flow fields water computational fluid dynamics. A commonality these is that the linear eddy-viscosity turbulence models employed. study delves into from aspect generation kinetic energy; nonlinear are used, as well a Reynolds stress model. novel identification method utilized to pinpoint vortex structures. Numerical results affirm outstanding performance estimate tanks. Both overestimate energy stagnation zone swirls. The overestimation can be restrained by including effect streamline curvature correction (SCC) production term. Even so, SCC does not help improve estimating accuracy between tensor mean rate-of-strain tensor. While offers some improvements, provides more effectvie solution. After that, we calculate different inlet–outlet configurations vertical horizontal scales increase inlet velocities Froude numbers, where number based on draining velocity depth above drain. distributions residence time shown design

Language: Английский

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Characterization of vortex structures with self-excited oscillations based on Liutex-Omega vortex identification method

Journal of Hydrodynamics, Journal Year: 2023, Volume and Issue: 35(1), P. 95 - 111

Published: Feb. 1, 2023

Language: Английский

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Evaluation of vortex evolution and energy loss within the impeller of a side channel pump

Journal of Hydrodynamics, Journal Year: 2023, Volume and Issue: 35(2), P. 240 - 251

Published: April 1, 2023

Language: Английский

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Identification of vortex boundaries in two-dimensional incompressible flows based on the Liutex-shear interaction

Journal of Hydrodynamics, Journal Year: 2023, Volume and Issue: 35(5), P. 825 - 831

Published: Oct. 1, 2023

Language: Английский

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A modified-Liutex-based vortex-core-line extractor and its application

Journal of Hydrodynamics, Journal Year: 2023, Volume and Issue: 35(4), P. 811 - 824

Published: Aug. 1, 2023

Language: Английский

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