The viscous flow induced near a wall by counter-rotating vortex pairs and vortex loops
Abstract
Vortex motion above walls is observed in a variety of physical situations. All of the vortex flows considered in this study are related to more complex vortex flows observed in a diverse variety of physical situations. The boundary layer induced by a pair of counter-rotating rectilinear vortices in motion above a plane in an otherwise stagnant fluid is addressed. A symmetric situation is considered where both vortices are equidistant from the wall. An asymmetric situation is considered where a counter-rotating pair approaches the wall at angle of attack. The calculated results for the boundary layer flow reveal a variety of unusual and complex unsteady separation effects; in most cases, the numerical solutions ultimately show strong localized and explosive boundary layer growth. The calculated results suggest that a boundary layer eruption is to be expected once a vortex pair is close to the wall. The motion of three-dimensional vortex loops which have a plane of symmetry is considered.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1985
- Bibcode:
- 1985PhDT........13E
- Keywords:
-
- Boundary Layers;
- Counter Rotation;
- Counterflow;
- Viscous Flow;
- Vortices;
- Walls;
- Flow Velocity;
- Symmetry;
- Time Dependence;
- Fluid Mechanics and Heat Transfer