Blockage influence on bi-stable flows of a notchback bluff body

The expected flow asymmetry behind a three-dimensional notchback Ahmed body is numerically investigated using large-eddy simulations with different blockage ratios of 0%, 5%, 10%, and 20%. focus the study on natural bi-stable influenced by ratio. Although wake can be observed under ratio within 0%−10%, significant influence sensitive bi-stability indicated structures, pressure gradients, dynamics achieved proper orthogonal decomposition. higher increases turbulence kinetic energy, velocity, negative in near-wake region, resulting decrease degree. consistency asymmetric found between 0% 5%. However, 20% symmetrizes wake. Several existing drag corrections for are discussed. wind tunnel experiment verifies low symmetrization