NASA Technical Reports Server (NTRS) 19930005499: Recent advances in numerical simulation and control of asymmetric flows around slender bodies

by: NASA Technical Reports Server (NTRS)

Publication date: 1992-11-01

Topics: NASA Technical Reports Server (NTRS), ASYMMETRY, COMPUTATIONAL FLUID DYNAMICS, NAVIER-STOKES EQUATION, THREE DIMENSIONAL FLOW, ACTIVE CONTROL, FLUX DIFFERENCE SPLITTING, MACH NUMBER, REYNOLDS NUMBER, SLENDER BODIES, Kandil, Osama A., Wong, Tin-Chee, Sharaf, Hazem H., Liu, C. H.,

Collection: NASA_NTRS_Archive; additional_collections

Language: English

The problems of asymmetric flow around slender bodies and its control are formulated using the unsteady, compressible, thin-layer or full Navier-Stokes equations which are solved using an implicit, flux-difference splitting, finite-volume scheme. The problem is numerically simulated for both locally-conical and three-dimensional flows. The numerical applications include studies of the effects of relative incidence, Mach number and Reynolds number on the flow asymmetry. For the control of flow asymmetry, the numerical simulation cover passive and active control methods. For the passive control, the effectiveness of vertical fins placed in the leeward plane of geometric symmetry and side strakes with different orientations is studied. For the active control, the effectiveness of normal and tangential flow injection and surface heating and a combination of these methods is studied.