Simulation of shallow transverse shear flow by generalized second moment method

Chu, Vincent H.; Altai, Wihel

doi:10.1080/00221686.2001.9628286

Cited by 15 publications

(3 citation statements)

References 12 publications

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“…In the Lagrangian step, the edge position x i n is a function that depends only on time. The entanglement of the Lagrangian paths is avoided by recasting the mass and momentum onto the Eulerian grid at each time step using the second moment method as suggested by Egan and Mahoney (1972) and Chu and Altai (2001). Chu and Altai (2001) used this Lagrangian block method to solve the vorticity equation for turbulence simulation.…”

Section: Lbem Formulationmentioning

confidence: 99%

Wave runup simulations using Lagrangian blocks on Eulerian mesh

Tan

Chu

2010

Journal of Hydro-environment Research

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Section: Lbem Formulationmentioning

confidence: 99%

Wave runup simulations using Lagrangian blocks on Eulerian mesh

Tan

Chu

2010

Journal of Hydro-environment Research

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“…Tan and Chu [26,27] validated their LBS of wet water on dry bed by the exact analytical solution. Chu and Altai [4][5][6] compared their LBS of the laminar-and-turbulent interfaces with the experimental observations. In this paper, the numerical accuracy is assessed by the energy consideration in Sect.…”

Section: Energy Conservation and Computational Errormentioning

confidence: 99%

“…Fluxes are not estimated so there are no numerical oscillation and diffusion errors from the truncation. Validation of the LBS method has been conducted in the calculation for the advance of wet water on dry bed by Tan and Chu [26,27] and in the simulations for the laminar-and-turbulent interfaces by Chu and Altai [4][5][6]. In the absence of spurious oscillations and false diffusion, the best possible inviscid model of the gravity-current head is constructed by the LBS.…”

Section: Introductionmentioning

confidence: 99%

A two-dimensional inviscid model of the gravity-current head by Lagrangian block simulation

Chu

Altai

2017

Environ Fluid Mech

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A two-dimensional inviscid model of the gravity-current head produced by the release of a relatively small volume of dense fluid from behind a tall lock gate is constructed by Lagrangian block simulation. Three numerical experiments are conducted for the lock's height-to-length aspect ratios H/L o = 8, 4 and 2. The front speeds obtained by the simulations agree with the laboratory observation for a similar range of aspect ratios. The floor velocity in the wake behind these heads is found to be greater than their front speed. The high floor velocity is caused by the impingement of the coherent wake vortex on the floor. It is a condition that permits these gravity-current heads to maintain their structural integrity so that the fine sediments can travel with the head over long distances on the ocean floor. The structural coherence of the current head depends on the lock aspect ratio. The gravity-current head produced by the release from the lock with the highest aspect ratio of H/L o = 8 is most coherent and relatively has the greatest floor velocity and the least trailing current behind the head.Keywords Gravity-current head Á Coherent wake vortex Á 2D inviscid model Á Lagrangian block advection Á Streamfunction and vorticity formulation

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2003

Hydrological Processes

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Simulation of shallow transverse shear flow by generalized second moment method

Cited by 15 publications

References 12 publications

Wave runup simulations using Lagrangian blocks on Eulerian mesh

Wave runup simulations using Lagrangian blocks on Eulerian mesh

A two-dimensional inviscid model of the gravity-current head by Lagrangian block simulation

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