Lagrangian coherent structures analysis of gas-liquid flow in a bubble column

Wu, Qing; Wang, Guoyu; Huang, Biao; Bai, Zeyu

doi:10.1007/s11433-014-5463-8

Cited by 5 publications

(1 citation statement)

References 25 publications

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“…To better validate and demonstrate the flow characteristics, additional experimental results would be added for the hydrofoil in the future work. As demonstrated in [29], the Eulerian approaches, such as streamlines, velocity vectors, and -vorticity contours, are aiming at partitioning the flow based on the instantaneous distribution of a scalar field, while the particle-based Lagrangian approach, such as particle track, is concerned with patterns emerging from the advection of passive tracers. An approach based on the trajectory of point over a period of time, finite-time Lyapunov exponent (FTLE), has been proven to be useful to evaluate exact vortex boundaries in unsteady flow field, but more systematic validations are needed, particularly for the specific temporal and spatial resolution for the pitching foil cases.…”

Section: Discussion and Future Workmentioning

confidence: 99%

Numerical Simulation of Transient Flows around a 3D Pitching Hydrofoil

Huang

Wang

2014

Advances in Mechanical Engineering

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The objective of this paper is to investigate the hydrodynamic characteristics of the transient flows around a 3D pitching hydrofoil via numerical studies, where the effects of tunnel wall boundary layer and gap flows are considered. Simulations are performed using an unsteady Reynolds Average Navier-Stokes solver and the k-ω SST turbulence model, coupled with a two-equation γ-Reθ transition model. Hydrodynamic forces and flow structures are compared to the results with the equivalent 2D computations. During the upward pitching stage, the transition phenomenon is accurately captured by both the 2D and 3D simulations. The slightly lower lift and suction side loading coefficients predicted by the 3D simulation are due to the pressure effects caused by the tip gap flow. During the dynamic stall stage, the 2D case exhibits a clear overshoot on the hydrodynamic force coefficients and the 3D simulation results better agree with the experimental results. During the downward pitching stage, the flow transitions back to laminar. As for the effect of gap flow and the wall boundary condition, the gap flow causes disturbances to the formation and development of the vortex structures, resulting in the complex distribution of the three-dimensional streamlines and the particle path.

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Section: Discussion and Future Workmentioning

confidence: 99%

Numerical Simulation of Transient Flows around a 3D Pitching Hydrofoil

Huang

Wang

2014

Advances in Mechanical Engineering

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Optimal dynamical systems of Navier-Stokes equations based on generalized helical-wave bases and the fundamental elements of turbulence

Peng

Guan

2016

Sci. China Phys. Mech. Astron.

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Flow and magnetic structures in a kinematic ABC-dynamo

Zhang

Lin

Huang

et al. 2020

Sci. China Phys. Mech. Astron.

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Dynamo theory describes the magnetic field induced by the rotating, convecting and electrically conducting fluid in a celestial body. The classical ABC-flow model represents fast dynamo action, required to sustain such a magnetic field. In this paper, Lagrangian coherent structures (LCSs) in ABC-flow are detected through Finite-time Lyapunov exponents (FTLE). The flow skeleton is identified by extracting intersections between repelling and attracting LCSs. For the case A = B = C = 1, the skeleton structures are made up from lines connecting two different types of stagnation points in the ABC-flow. The corresponding kinematic ABC-dynamo problem is solved using a spectral method, and the distribution of cigar-like magnetic structures visualized. Inherent links are found to exist between LCSs in the ABC-flow and induced magnetic structures, which provide insight into the mechanism behind the ABC-dynamo. kinematic dynamo theory, ABC-flow, lagrangian coherent structure

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Lagrangian coherent structures analysis of gas-liquid flow in a bubble column

Cited by 5 publications

References 25 publications

Numerical Simulation of Transient Flows around a 3D Pitching Hydrofoil

Numerical Simulation of Transient Flows around a 3D Pitching Hydrofoil

Optimal dynamical systems of Navier-Stokes equations based on generalized helical-wave bases and the fundamental elements of turbulence

Flow and magnetic structures in a kinematic ABC-dynamo

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