1,721,257 research outputs found
Variational multiscale LES investigation of drag and near-wake flow of an axisymmetric blunt-based body.
No full textDNS of convective heat transfer in a rotating cylinder
Get PDFThe effects of rotation on the convective heat transfer and flow structuring in a cylindrical volume of fluid is investigated with direct numerical simulation (DNS). A formulation of the discrete equations of motion in cylindrical coordinates is solved with finite-difference approximations. At constant Rayleigh (Ra; dimensionless temperature gradient) and Prandtl (s; characterises diffusive properties of the fluid) numbers, the Rossby number Ro, the ratio of buoyancy and Coriolis forces, is varied between runs with 0. 045 = Ro = 8. For Ro ¿ 1. 2 we find the so-called large-scale circulation. At Ro ¿ 1. 2 slender columnar vortical plumes are found. In a range of Ro heat transfer is increased by Ekman pumping in the vortical plumes
Reliability of LES simulations in the context of a benchmark on the aerodynamics of a 5:1 rectangle
No full textSpatial Filtering for Reduced Order Modeling
Get PDFSpatial filtering has been central in the development of large eddy simulation reduced order models (LES-ROMs) and regularized reduced order models (Reg-ROMs), In this paper, we perform a numerical investigation of spatial filtering. To this end, we consider one of the simplest Reg-ROMs, the Leray ROM (L-ROM), which uses ROM spatial filtering to smooth the flow variables and decreases the amount of energy aliased to the lower index ROM basis functions. We also propose a new form of ROM differential filter and use it as a spatial filter for the L-ROM. We investigate the performance of this new form of ROM differential filter in the numerical simulation of a flow past a circular cylinder at a Reynolds number Re=760
Variational Multiscale LES Investigation of Drag and Near-Wake Flow of an Axisymmetric Blunt-Based Body
No full textNo abstract availabl
- …
