Research Keyword turbulence
Carl Friehe
http://gram.eng.uci.edu/~maeadmin/Faculty/CAF/CAF.htm
Professor Emeritus
Mechanical and Aerospace Engineering
Office/Lab: EG 1114
Professor Emeritus, Joint Appointment
Earth System Science
Dr. Friehe is interested in fluid mechanics, turbulence, micrometerology, and instrumentation.
His research focuses on turbulence in the atmosphere, particularly that responsible for energy exchanges between the land and ocean, and the overlying atmosphere. Dr. Friehe specializes in geophysical turbulence measurements of wind, temperature, humidity and pressure to parameterize fluxes of heat, water and momentum at the earth's surface. His efforts are aimed at a better understanding of the physics of the marine boundary layer in a wide variety of weather situations. The measurements, which require high fidelity instruments and statistical analysis of large data sets, are usually obtained from specialized experiments on research aircraft, towers, or unique sea-going platforms.
In collaboration with colleagues at the Scripps Institution of Oceanography, Woods Hole Institution of Oceanography and other entities around the world, Dr. Friehe currently is involved in two large-scale research endeavors: the Marine Boundary Layer Experiment, a project aimed at understanding the physics of the energy exchanges between the air and ocean; and TOGA/CEPEX, which is focused on analyzing aircraft data from the Tropical Ocean Global Atmosphere/Central Equatorial Pacific Experiment.
John LaRue
http://gram.eng.uci.edu/~maeadmin/Faculty/JCLaRue/
Associate Dean for Student Affairs
Student Affairs
Lab: ELF 134
MAE Office: EG 3226
UGSA Office: ECT 101
MAE Office: EG 3226
UGSA Office: ECT 101
Professor
Mechanical and Aerospace Engineering
Dr. LaRue is interested in the design and development of micro-electro-mechanical systems (MEMS), fluid mechanics, heat transfer and turbulence, and other areas that bridge those fields.
Dr. LaRue's work primarily concerns the development and assessment of MEMS-based sensors and flow devices using bulk machining processes. His research in this area includes micro-flows (e.g., flows in micro-channels and flow through seals), sensors and optical MEMS devices. Dr. LaRue is developing and/or analyzing MEMS sensors including bi-directional flow sensors, binary concentration sensors and remotely sensed shear-stress sensors, and, in the area of optical MEMS, a bulk-machined Fabry-Perot interferometer.
The overall goal of Dr. LaRue's work in fluid mechanics is to better understand turbulent flows and specifically, mixing in turbulent flows. He and his group are investigating heat in turbulent flows, with the goal of increasing the efficiency of the heat transfer process. Another project concerns the study of the two-way coupling between particles and turbulent flow.
Dr. LaRue also is carrying out investigations into the effect of strain on turbulent flow and heat transfer, augmented heat exchange, particle dispersion in turbulent flows, the effect of free-stream turbulence on jet mixing, similarity in plane wake flows, near-surface measurements and olfactory-evoked potentials.
Associate Dean
1
Dimitri Papamoschou
http://supersonic.eng.uci.edu/
Associate Dean for Academic Affairs
Dean's Office
Associate Dean Office: REC 305G
MAE Office: EG 4214
Lab: EG 1175
MAE Office: EG 4214
Lab: EG 1175
Professor
Mechanical and Aerospace Engineering
Dr. Papamoschou is interested in compressible turbulence, jet aeroacoustics, mixing enhancement, and advanced diagnostic methods.
Research on jet aeroacoustics focuses on new ways to suppress sound generated from aircraft engines. This includes high-bypass turbofan engines used on commercial jetliners and low-bypass engines used in supersonic aircraft. Noise suppression technologies invented by Dr. Papamoschou include the Fan Flow Deflection (FFD) technique and the Mach Wave Elimination (MWE) method. FFD is directed mostly for subsonic aircraft while MWE is applicable primarily to supersonic aircraft. Both technologies are being actively investigated not only at UCI but also at NASA. On the FFD technique in particular, the university has teamed up with an industrial partner for commercialization. The foundation of the noise reduction methods is basic research on the mean flow, turbulent structure, and acoustic emission of compressible jets and shear layers. While the bulk of the research is experimental, theoretical efforts are also being pursued.
Mixing enhancement is desirable in a host of applications, from fuel injectors to turbine engine exhausts. An innovative technique, developed by Dr. Papamoschou, uses axial flow of a gas to enhance mixing of the gas itself or of an adjacent fluid (gas or liquid). The method, called Mixing Enhancement Using Axial Flow (MEAF), has been applied to subsonic and supersonic gaseous jets issuing from round or rectangular nozzles, as well as water jets simulating fuel injectors. Some of the nozzles used in the gaseous tests have simulated geometries of turbofan and turboprop exhausts. The fundamental phenomenon that causes mixing is supersonic nozzle flow separation. It is being investigated in dedicated facilities using optical diagnostics and turbulence measurements.
Experiments for all the subjects mentioned above are being conducted in a lab equipped with unique test rigs designed and built at UCI. The investigation of turbulent and aeroacoustic phenomena often requires use of specialized diagnostics, some of which were developed in this lab. This includes a double-exposure laser-induced fluorescence method for detection of the turbulent structure in jets and shear layers, and a small-aperture microphone phased array for localization of noise sources in turbulent jets.
Dr. Papamoschou collaborates with researchers at UCI and outside institutions, including NASA Glenn Research Center, NASA Langley Research Center, Goodrich Corporation, Boeing Company, National University of Singapore,
Associate Dean
Haris Catrakis
Associate Professor
Mechanical and Aerospace Engineering
Office: EG 4218
The research fields of Prof. Catrakis and his students are turbulence, flow dynamics, and multiscale phenomena in general, with emphasis on fundamental aspects of multiscale dynamics, predictability, and optimization. Because turbulence is a widely occurring phenomenon consisting of highly irregular motion across a wide range of scales, the study of turbulence has broad significance across a wide range of multidisciplinary applications such as air, land, sea, and space systems, environmental phenomena, human health, sustainable energy, communications, atmospheric dynamics, ocean dynamics, weather forecasting, as well as global climate change, with turbulence serving as a paradigm of multiscale behavior for complex phenomena.
The research approach of Prof. Catrakis and his students consists of basic theories including testing by computations and visualizations, with emphasis on mathematical methods, physical modeling, variational principles, direct numerical simulations, large-eddy simulations, smoothed particle computing, multiscale visualizations, predictability, and flow optimization. Prof. Catrakis is the recipient of several awards including the National Science Foundation Career Award, the Fitzpatrick Prize in Physics, the Rutty Prize in Mathematics, the Esso Award in Science, the Buhler Award in Aeronautics, the Mager Prize in Engineering, and the Henry Ford Scholar Award. Prof. Catrakis has also been elected Associate Fellow of the American Institute of Aeronautics and Astronautics.
The research approach of Prof. Catrakis and his students consists of basic theories including testing by computations and visualizations, with emphasis on mathematical methods, physical modeling, variational principles, direct numerical simulations, large-eddy simulations, smoothed particle computing, multiscale visualizations, predictability, and flow optimization. Prof. Catrakis is the recipient of several awards including the National Science Foundation Career Award, the Fitzpatrick Prize in Physics, the Rutty Prize in Mathematics, the Esso Award in Science, the Buhler Award in Aeronautics, the Mager Prize in Engineering, and the Henry Ford Scholar Award. Prof. Catrakis has also been elected Associate Fellow of the American Institute of Aeronautics and Astronautics.
