Flow Around a Sharp-Edged Surface-Mounted Cube by Large Eddy Simulation

NORBERTO NIGRO; GERMÁN FILIPPINI; GERARDO FRANCK; MARIO STORTI; JORGE D’ELÍA

Buenos Aires

Congreso; VIII Congreso Argentino de Mecánica Computacional; 2005

AMCA, Asociación Argentina de Mecánica Computacional

Unsteady separated flows around bluff bodies such as cubes, rectangular and circular cylinders and flat plates are relevant to many engineering designs. For numerical validations, some test cases have been chosen as benchmarks in the turbulence modeling community where several numerical methods, Sub-Grid Stress (SGS) models and mesh resolutions are currently validated, see paper by Kogaki1 We have performed Large Eddy Simulations of the three dimensional flow field around a wall-mounted cube, a very popular benchmark. In this case, experiments show a fully turbulent flow regime everywhere and displays no obvious regularity or periodicity and contains many coherent structures both downstream and upstream. The selected flow conditions for the present numerical simulations are taken from those suggested by Rodi.2 The Reynolds number is 40,000 while the boundary conditions include a fully developed channel flow at inlet, periodic at lateral sides, null pressure at outlet and no-slip at the wall surface. Here, the upstream flow at inlet is a fully developed channel flow which is obtained by a previous running for such case. Flow visualization is used to clarify the flow behavior.