Turbulent drag reduction versus structure of turbulence
Abstract
A study is made of the possibility of reducing the turbulent drag by altering the structure of turbulent flow in such a way as to reduce the turbulent dissipation of energy. Several known examples of low-dissipation turbulent flows are examined, including turbulent MHD flow in the presence of an azimuthal magnetic field, dilute and heterogeneous polymer flows, and negative-viscosity flows. The existing experimental evidence and simple theoretical examples indicate that flow anisotropy is the most important property necessary (but not sufficient) to maintain low turbulent dissipation.
- Publication:
-
Structure of Turbulence and Drag Reduction
- Pub Date:
- 1990
- Bibcode:
- 1990stdr.proc..313T
- Keywords:
-
- Drag Reduction;
- Flow Resistance;
- Magnetohydrodynamic Turbulence;
- Turbulent Flow;
- Energy Dissipation;
- Flow Stability;
- Magnetic Field Configurations;
- Reynolds Stress;
- Fluid Mechanics and Heat Transfer