DOI: 10.1615/TSFP3
LARGE EDDY SIMULATION OF SUPERSONIC AXISYMMETRIC BASEFLOW
摘要
Flows around missiles, rockets and projectiles often experience baseflow separation. This means that the pressure behind the base is considerably lower than the freestream pressure, causing base drag that often constitutes a large portion of the total drag. The present study is motivated by the fact that most methods used for reducing the drag often also reduce the aerodynamic stability of the vehicle. Semianalytical methods and Reynolds Average Navier-Stokes (RANS) models often fail to provide accurate results for such flows, and therefore we use Large Eddy Simulations (LES) to investigate the flow physics of axisymmetric baseflow in a configuration for which experimental data is available for comparison. Good agreement with experimental data, with and without, base bleed is obtained for several LES models, suggesting that the details of the subgrid model are of less importance. The simulation data are also examined with the intention of increasing our knowledge of the underlying flow physics.