Flow Around A Sharp-Edged Surface-Mounted Cube By Large Eddy Simulation

Abstract

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.