Department of Mechanical and Aerospace Engineering

Overview

Turbulence is encountered in everyday life, from the airflow around a moving car, to the water flowing out of a sink faucet, to ocean waves crashing upon a shoreline. It is comprised of the vortices and eddies within a fluid, from the large-scale recirculation zones shedding off a building in a strong wind, to the velocity and pressure fluctuations caused by an underwater jet. Its study and prediction are important because turbulence plays an important role in many fluid analyses including determining drag on an aircraft wing and the rate of diffusion of gaseous mixtures.

Paavo Sepri, Ph.D.

Tel: (321)674-8092, email: sepri@fit.edu

Research Interests

Aerodynamic testing of flow in wing/body junctions; hot-wire anemometry of heated grid turbulence; turbulent boundary layer modeling; turbulent moisture transport; and free convection instabilities.

Current Related Research Projects

Transition to Turbuence and its Connection to Chaos Theory

Selected Publications

"Exponential Wake Structure of Heated Boundary Layers at Elevated Levels of Free-Stream Turbulence," Journal of Heat Transfer, June 1987, pp. 336-344.

"Two Point Turbulence Measurements Downstream of a Heated Grid," Physics of Fluids, December 1976, pp. 1876-1884.

Chelakara S. Subramanian, Ph.D, P.Eng(U.K.)
Tel: (321)674-7614, email: subraman@fit.edu

Research Interests

The structure of turbulence in various types of complex flows (including vortex imbedded boundary layers, curved shear layers, rigid and flexible roughness effects, rotating shear layers and unsteady flows). The purpose is to explain the underlying mechanism of turbulence and to develop better flow models, which will help to develop more efficient engines for space vehicles and high-performance airfoils for the future generation airplanes.

Current Related Research Projects

Effects of Strong Roughness on Boundary Layer Turbulence Structure (WPAFB funded)

Effects of Marine Bio-Fouling Roughness on Boundary layer Structure (NSF/HBOI Funded)

Wind Effects on Emergency Rescue Vehicles ( FEMA/FDCA funded)

This will determine the safest driving speeds under different wind and road conditions for fire and rescue vehicles.

Selected Publications

"A study of Hydrodynamic Characteristics of Boundary Layer with Algae Roughness",SNAME Marine Technology Journal, April 2004

"Non-Contact Measurement of Marine Bio-Fouling Roughness", SNAME Marine Technology Journal, April 2004

"Effects of Strong Irregular Roughness on the Turbulent Boundary Layer", Flow, Turbulence and Combustion Journal, 2004

"Wind Effects on Emergency Vehicles", Journal of Wind Engineering and Industrial Aerodynamics, 2004

"Bursts and the Law of the Wall in Turbulent Boundary Layers", Journal of Fluid Mechanics, 1992