Mechanical Engineering Seminar by Dr. Ali Mashayek of MIT
When: Thursday,
December 1, 2016
1:00 PM
-
2:00 PM
Where: Textiles Building 101E
Description: The Mechanical Engineering Department is pleased to announce the following SEMINAR:
DATE:
December 1, 2016
TIME:
1:00 p.m. 2:00 p.m.
LOCATION:
Textile Building, Room 101E
SPEAKER:
Dr. Ali Mashayek, Postdoctoral Associate
Department of Earth, Atmosphere and Planetary Sciences at MIT
TOPIC:
Turbulent mixing in the ocean: from small scale shear-induced turbulence to large scale overturning circulation
ABSTRACT:
Motivated by the importance of diapycnal mixing parameterizations in large scale ocean general circulation models, I provide a detailed analysis of high Reynolds number mixing in density stratified shear flows which constitute an archetypical example of the small scale physical processes occurring in the oceanic interior that control turbulent diffusion. My focus is upon the issue as to whether the route to fully developed turbulence in the stratified mixing layer is in any significant way determinant of diapycnal mixing efficiency as presented by an effective turbulent diffusivity. I will argue the answer is yes. I will then present a first crude attempt at connecting understanding of small scale physics of wave-induced turbulence in the ocean to the global ocean abyssal circulation and will argue that the small scale physics I study has a leading order impact on the climate system.
BIO:
I am a Postdoctoral Associate at the Department of Earth, Atmosphere and Planetary Sciences ( EAPS ) at MIT. In my research I employ knowledge of fluid mechanics, applied mathematics and numerical methods to study problems in geophysical fluid dynamics, interfacial dynamics, theory of stratified turbulence, coupled atmosphere/ocean large scale circulation and climate dynamics.
I received a PhD in physics from the Earth, Atmospheric, and Planetary Physics group, EAPP, at the University of Toronto. My PhD thesis, was focused on studying (I) wave mechanics, stratified turbulence, and quantification of diapycnal mixing in the shear-dominated mixing layers in the atmosphere and ocean; (II) role of Southern Ocean winds and enhanced abyssal ocean mixing in driving the ocean overturning circulation. The former was partially done in collaboration with DAMTP, University of Cambridge, while the later was in collaboration with EAPS, MIT.
For more information please contact Dr. Mehdi Raessi, MNE Seminar Coordinator (mraessi@umassd.edu, 508-999-8496).
All are welcome and light refreshments will be served!
Students taking MNE-500 are REQUIRED to attend! All other MNE students are encouraged to attend.
EAS students are encouraged to attend.
Thank you,
Sue Cunha, Administrative Assistant
508-999-8492
scunha@umassd.edu
DATE:
December 1, 2016
TIME:
1:00 p.m. 2:00 p.m.
LOCATION:
Textile Building, Room 101E
SPEAKER:
Dr. Ali Mashayek, Postdoctoral Associate
Department of Earth, Atmosphere and Planetary Sciences at MIT
TOPIC:
Turbulent mixing in the ocean: from small scale shear-induced turbulence to large scale overturning circulation
ABSTRACT:
Motivated by the importance of diapycnal mixing parameterizations in large scale ocean general circulation models, I provide a detailed analysis of high Reynolds number mixing in density stratified shear flows which constitute an archetypical example of the small scale physical processes occurring in the oceanic interior that control turbulent diffusion. My focus is upon the issue as to whether the route to fully developed turbulence in the stratified mixing layer is in any significant way determinant of diapycnal mixing efficiency as presented by an effective turbulent diffusivity. I will argue the answer is yes. I will then present a first crude attempt at connecting understanding of small scale physics of wave-induced turbulence in the ocean to the global ocean abyssal circulation and will argue that the small scale physics I study has a leading order impact on the climate system.
BIO:
I am a Postdoctoral Associate at the Department of Earth, Atmosphere and Planetary Sciences ( EAPS ) at MIT. In my research I employ knowledge of fluid mechanics, applied mathematics and numerical methods to study problems in geophysical fluid dynamics, interfacial dynamics, theory of stratified turbulence, coupled atmosphere/ocean large scale circulation and climate dynamics.
I received a PhD in physics from the Earth, Atmospheric, and Planetary Physics group, EAPP, at the University of Toronto. My PhD thesis, was focused on studying (I) wave mechanics, stratified turbulence, and quantification of diapycnal mixing in the shear-dominated mixing layers in the atmosphere and ocean; (II) role of Southern Ocean winds and enhanced abyssal ocean mixing in driving the ocean overturning circulation. The former was partially done in collaboration with DAMTP, University of Cambridge, while the later was in collaboration with EAPS, MIT.
For more information please contact Dr. Mehdi Raessi, MNE Seminar Coordinator (mraessi@umassd.edu, 508-999-8496).
All are welcome and light refreshments will be served!
Students taking MNE-500 are REQUIRED to attend! All other MNE students are encouraged to attend.
EAS students are encouraged to attend.
Thank you,
Sue Cunha, Administrative Assistant
508-999-8492
scunha@umassd.edu
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