Prediction of vortex shedding from circular and noncircular bodies in subsonic flow
Abstract
An engineering prediction method and associated computer code VTXCLD are presented which predict nose vortex shedding from circular and noncircular bodies in subsonic flow at angles of attack and roll. The axisymmetric body is represented by point sources and doublets, and noncircular cross sections are transformed to a circle by either analytical or numerical conformal transformations. The leeward vortices are modeled by discrete vortices in crossflow planes along the body; thus, the three-dimensional steady flow problem is reduced to a two-dimensional, unsteady, separated flow problem for solution. Comparison of measured and predicted surface pressure distributions, flowfield surveys, and aerodynamic characteristics are presented for bodies with circular and noncircular cross sectional shapes.
- Publication:
-
NASA STI/Recon Technical Report N
- Pub Date:
- January 1987
- Bibcode:
- 1987STIN...8716981M
- Keywords:
-
- Circular Cylinders;
- Predictions;
- Subsonic Flow;
- Vortex Shedding;
- Aerodynamic Characteristics;
- Angle Of Attack;
- Axisymmetric Bodies;
- Flow Distribution;
- Roll;
- Steady Flow;
- Three Dimensional Flow;
- Fluid Mechanics and Heat Transfer