Lattice Boltzmann simulation of the flow interference in bluff body wakes

This paper presents a two-dimensional numerical simulation of fluid flow around a couple of identical circular cylinders aligned, respectively, along and orthogonal to the main-flow direction, at several distances. A lattice Boltzmann (LB) method is used. The forces resulting from fluid-solid interaction are calculated by considering the momentum exchanged between the fluid and the solid surfaces. Bluff body wake interference and its effect on drag and lift forces is studied in detail. The drag and the lift coefficients are obtained and compared with other existing results. A transition regime is obtained when the cylinders are aligned orthogonal to the main-flow direction and separated by distances smaller than about 2D. (C) 2003 Published by Elsevier B.V.