Determination of the shedding frequency of cavitation cloud in a submerged cavitation jet based on high-speed photography images

Journal of Hydrodynamics, Год журнала: 2021, Номер 33(1), С. 127 - 139

Опубликована: Фев. 1, 2021

Язык: Английский

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Investigation of correlation between vorticity, Q, λci, λ2, Δ

Computers & Fluids, Год журнала: 2021, Номер 225, С. 104977 - 104977

Опубликована: Май 6, 2021

Язык: Английский

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Correlation between vorticity, Liutex and shear in boundary layer transition

Computers & Fluids, Год журнала: 2022, Номер 238, С. 105371 - 105371

Опубликована: Март 2, 2022

Язык: Английский

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Identifying the turbulent flow developing inside and around the bottom trawl by Electromagnetic Current Velocity Meter approach in the flume tank

Journal of Hydrodynamics, Год журнала: 2021, Номер 33(3), С. 636 - 656

Опубликована: Июнь 1, 2021

Язык: Английский

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Liutex core line and POD analysis on hairpin vortex formation in natural flow transition

Journal of Hydrodynamics, Год журнала: 2020, Номер 32(6), С. 1109 - 1121

Опубликована: Дек. 1, 2020

Язык: Английский

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New governing equations for fluid dynamics

AIP Advances, Год журнала: 2021, Номер 11(11)

Опубликована: Ноя. 1, 2021

The difference in the governing equation between inviscid and viscous flows is introduction of terms. Traditional Navier–Stokes (NS) equations define stress based on Stokes’s assumptions. In NS equations, supposedly proportional to strain, both strain tensors are symmetric. There several questions with which include following: 1. Both symmetric shear terms stretching coordinate-dependent thus not Galilean invariant. 2. physical meaning diagonal off-diagonal elements clear, coordinate-dependent. 3. It hard measure quantitatively, viscosity really measured by vorticity, strain. 4. no vorticity tensor plays an important role fluid flow, especially for turbulent flow. newly proposed dynamics use only, anti-symmetric. advantages anti-symmetric, invariants independent coordinate rotation. anti-symmetric stress. Viscosity coefficients obtained experiments, vorticity. term can be further decomposed into rigid rotation shear, turbulence research. 5. computation cost reduced half as all zero six three. Several computational examples tested, clearly demonstrate new have exactly same results. As shown below, identical mathematics, but one has lower mentioned above, including possibility study flow better. recommended instead equations. unique definition operation vectors matrix also discussed this paper.

Язык: Английский

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Application of Omega vortex identification method in cavity buffeting noise

Journal of Hydrodynamics, Год журнала: 2021, Номер 33(2), С. 259 - 270

Опубликована: Апрель 1, 2021

Язык: Английский

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Effects of baffle on flow structure and cyclic variation in stirred tanks with Rushton turbine

AIP Advances, Год журнала: 2022, Номер 12(1)

Опубликована: Янв. 1, 2022

In order to reveal the effect of baffles on flow structure and cyclic variation stirred by Rushton turbines, particle image velocimetry experiments were performed in baffled unbaffled tanks. a tank, peak value time-averaged velocity obviously increases, high region enlarges significantly, fluctuation fluid elements near turbine increases significantly. 20° phase plane swirl strength slightly enlarges, but phase-resolved is lower. The regions turbulent kinetic energy are larger tank at various planes. Using quadruple proper orthogonal decomposition, field decomposed into small-scale part, transition large-scale mean part with different spatial scales. Adding baffle, largest scale (it favorable for mass transfer liquid levels) which mainly includes random cascade, enhances conducive diffusion). main influence blade passages large-scale, standard deviation time coefficients decreases 3%–4% adding baffle.

Язык: Английский

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Proper Orthogonal Decomposition Analysis of Coherent Structure in a Turbulent Flow after a Micro-vortex Generator

Applied Mathematical Modelling, Год журнала: 2021, Номер 104, С. 140 - 162

Опубликована: Ноя. 10, 2021

Язык: Английский

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Investigation of vortex motion mechanism of synthetic jet in a cross flow

AIP Advances, Год журнала: 2022, Номер 12(3)

Опубликована: Март 1, 2022

To investigate the mechanism of vortex motion, a pitched synthetic jet is arranged on bottom cross flow and simulated by incompressible Naiver–Stokes equations with large eddy simulation. The Liutex vector identification method utilized to quantitatively study rotation strength core size structures according various driving frequencies (St = 0.25, 0.5, 0.75, 1.0) amplitudes (A0 1.0, 1.5, 2.0, 2.5) during 21 periods. results show that both frequency amplitude play significant role in generation jet. However, makes positive contribution size, while negative contribution. motion can be summarized as follows: low small favor primary clockwise vortex, high motivate anticlockwise generation.

Язык: Английский

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