Lattice Boltzmann simulations of gravity currents

被引：37

作者：

Ottolenghi, L. ^{[1
]}

Prestininzi, P. ^{[1
]}

Montessori, A. ^{[1
]}

Adduce, C. ^{[1
]}

La Rocca, M. ^{[1
]}

机构：

[1] Univ Roma Tre, Dept Engn, I-00146 Rome, Italy

来源：

EUROPEAN JOURNAL OF MECHANICS B-FLUIDS | 2018年 / 67卷

关键词：

Buoyancy-driven flows; Computational methods in fluid dynamics; Lattice-Boltzmann method; SHALLOW-WATER MODEL; ROTATING FLUID; COMPLEX FLOWS; LOCK-EXCHANGE; ENTRAINMENT; BOUNDARIES; HEAD; 2-LAYER; SLOPE;

D O I：

10.1016/j.euromechflu.2017.09.003

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

This paper is aimed at assessing the ability of the Lattice-Boltzmann Method (LBM) in reproducing the fundamental features of lock-exchange gravity currents. Both two- and three-dimensional numerical simulations are presented at different Reynolds numbers (1000 <= Re <= 30,000). Turbulence has been accounted for by implementing an equivalent Large Eddy Simulation (LES) model in the LBM framework. The advancement of the front position and the front velocity obtained by LBM numerical simulations are compared with laboratory experiments appositely performed with similar initial and boundary conditions and with previous results from literature, revealing that the dynamics of the gravity current as a whole is correctly reproduced. Lobes and clefts instabilities arising in three-dimensional simulations and the entrainment parameter are also analysed and comparisons with previous studies are presented. (C) 2017 Elsevier Masson SAS. All rights reserved.

引用

页码：125 / 136

页数：12

共 54 条

[21] Analysis and direct numerical simulation of the flow at a gravity-current head.: Part 1.: Flow topology and front speed for slip and no-slip boundaries [J].