Large-eddy simulations of the ow around a square cylinder on coarse unstructured grids are investigated. The numerical solver is based on a mixed nite-volume=nite-element formulation. A modied Roe scheme is employed for convective terms, together with the MUSCL method to increase the order of accuracy. An upwinding parameter, s, directly controls the numerical diusion, which is formed of fourth-order space derivatives. The eddy-viscosity Smagorinsky model and its dynamic version are used for the subgrid scale (SGS) terms in the LES equations. The eects of upwinding, and, in particular, the interaction between SGS and numerical dissipation, are studied by varying the value of s. The sensitivity to grid inhomogeneity and to SGS modelling are also investigated. Results are compared to those obtained in other LES in the literature and to experimental data.
Large-eddy simulation of a bluff-body flow on unstructured grids
CAMARRI, SIMONE;SALVETTI, MARIA VITTORIA;
2002-01-01
Abstract
Large-eddy simulations of the ow around a square cylinder on coarse unstructured grids are investigated. The numerical solver is based on a mixed nite-volume=nite-element formulation. A modied Roe scheme is employed for convective terms, together with the MUSCL method to increase the order of accuracy. An upwinding parameter, s, directly controls the numerical diusion, which is formed of fourth-order space derivatives. The eddy-viscosity Smagorinsky model and its dynamic version are used for the subgrid scale (SGS) terms in the LES equations. The eects of upwinding, and, in particular, the interaction between SGS and numerical dissipation, are studied by varying the value of s. The sensitivity to grid inhomogeneity and to SGS modelling are also investigated. Results are compared to those obtained in other LES in the literature and to experimental data.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
