PANS VS. LES FOR COMPUTATIONS OF THE FLOW AROUND A3D BLUFF BODY
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This paper presents comparisons between recently
proposed Partially-Averaged Navier-Stokes
(PANS) method with the Large Eddy Simulation
(LES) for the flow around the Ahmed bluff body.
PANS model changes seamlessly from Reynolds-
Averaged Navier-Stokes (RANS) to the direct numerical
solution of the Navier-Stokes equations
(DNS) as the unresolved-to-total ratios of kinetic energy
and dissipation are varied. The parameter which
determines the unresolved-to-total kinetic energy ratio
is defined based on the grid spacing and it is dynamically
adjusted at each point at the end of every
time step. The main target of this paper is to show if
PANS obtains comparable results with LES calculations
on finer meshes and improves results on coarser
meshes. In other words, the question to be answered
is whether PANS can provide the optimum solution
for every computational mesh. This will be achieved
by comparing PANS calculations on two different
computational meshes: 3.4 mil.(grid A), and 8.0 mil.
(grid B), with LES calculations on grid A and additional
two grids consisting of 9.5 mil. cells (grid C)
and 16.5 mil. cells (grid D).