Generalized primary/secondary flow analysis of viscous flow around bodies at incidence
Abstract
Generalized primary/secondary flow equations, which are an approximation to the NavierStokes equations, have been utilized to compute the threedimensional viscous flow around bodies at incidence. Two features central to the approximations in the primary/secondary flow equations are a locally specified primary flow direction and a decomposition of the secondary velocity field. For the flow around a body at incidence, the local primary flow direction is aligned with streamlines for the potential flow around the body at zero degrees incidence. A sequentially decoupled implicit algorithm exploits the form of the primary/secondary flow equations for fast run times. Computed solutions for flow around an ogive cylinder at incidence and an unappended submarine hull in drift have been presented. These solutions show the generation of strong leeside vortices which are a source of propulsor inlet distortion and a sideforce on the body. Computed solutions agree well with available experimental data. The combined efficiency and accuracy of the approximate equations and solution algorithm make this approach attractive for computing viscous flow around bodies at incidence.
 Publication:

29th AIAA Aerospace Sciences Meeting
 Pub Date:
 January 1991
 Bibcode:
 1991aiaa.meetT....G
 Keywords:

 Computational Fluid Dynamics;
 Flow Deflection;
 Secondary Flow;
 Three Dimensional Flow;
 Turbulence Models;
 Viscous Flow;
 Flow Velocity;
 Hulls (Structures);
 Incidence;
 Mach Number;
 NavierStokes Equation;
 Prandtl Number;
 Vorticity;
 Fluid Mechanics and Heat Transfer