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Computational Thermal Sciences: An International Journal

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ISSN Druckformat: 1940-2503

ISSN Online: 1940-2554

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LAGRANGIAN BLOCK SIMULATION OF BUOYANCY AT TURBULENCE INTERFACES

Volumen 7, Ausgabe 2, 2015, pp. 181-189
DOI: 10.1615/ComputThermalScien.2015011933
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ABSTRAKT

Simulations of turbulent interfaces produced by positive and negative buoyancy are conducted by moving blocks of vorticity and buoyancy in the direction of the flow. The second moment of the blocks increases at a rate proportional to the diffusivity. The block simulation has been shown to be relatively free of numerical oscillations. Unlike most classical methods, the error associated with Lagrangian block simulation (LBS) is not cumulative. Artificial diffusion error is negligible. This relatively non-diffusive LBS method is employed to simulate buoyancy at turbulence interfaces that are under the stabilizing and destabilizing influences by the force of buoyancy. In one series of simulation, the turbulence is initiated by shear and subjected to the stabilizing influence of the buoyancy force. In the other series, turbulence is produced by the destabilizing influence of the buoyancy force. The two series of simulations are evaluated to compare performance between (i) the large eddy simulation (LES) method and (ii) the K -ε modeling of turbulent flow.

REFERENZIERT VON
  1. Chu Vincent H., Altai Wihel, A two-dimensional inviscid model of the gravity-current head by Lagrangian block simulation, Environmental Fluid Mechanics, 18, 1, 2018. Crossref

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