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{Seminar} @ CDS: 27th July: “Emergence of turbulent behavior at low to moderate Reynolds numbers in direct numerical simulations”

27 Jul @ 2:30 PM -- 3:30 PM

Department of Computational and Data Sciences

Department Seminar

 

SPEAKER   : Dr. Sualeh Khurshid, Massachusetts Institute of Technology, MA, USA.

TITLE          :“Emergence of turbulent behavior at low to moderate Reynolds numbers in direct numerical simulations”

Date & Time: July 27, 2022, 2:30 PM.

Venue            : #102 CDS Seminar Hall.

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ABSTRACT

Turbulent flows are ubiquitous in natural and engineering applications. It is therefore critically important to develop fundamental understanding of turbulent processes to improve predictive capabilities of turbulent fluid systems. An important hurdle in characterizing turbulent flows is the presence of extreme events, e.g. in dissipation, velocity gradients etc. These events are often very high-dimensional in nature and require large degrees of freedom/grid points to resolve accurately in simulations. The extreme events become stronger at high Reynolds number ( ) that are characteristic of realistic flows. Therefore, the focus of much of turbulence research has been to simulate very high-flows. This is a challenging computational task as the computational workload can grow as steeply as. In this talk, we present a new theoretical perspective on understanding high-turbulence using well-resolved simulations at low to moderate, that can be simulated on supercomputers available today. We will show that features of high-can be studied at finite and small values of, rather than the infinite limit. The simulations have the finest small-scale resolution in literature and long time-series. A primary focus is on the universality of small-scales and the scaling of extreme events. The consequences of these fundamental insights on modeling approaches, phenomenological and data-driven, in complex turbulent flows will also be discussed. The work also provides a new perspective on computational study of complex systems at very high values of dynamically relevant parameters.

 

BIOGRAPHY

Sualeh Khurshid is a Computing Innovation Fellow and Postdoctoral Associate in Mechanical Engineering at Massachusetts Institute of Technology. His research is focussed on understanding fundamental characteristics of turbulent flows in various regimes using direct numerical simulations with a focus on characterizing extreme events. His work includes developing high performance simulation codes, appropriate numerical methods and  reduced order models using phenomenological and data-driven methods. He completed undergraduate programs in Aerospace Engineering and Physics and earned his Ph.D. in Aerospace Engineering at Texas A&M University.

 

Host Faculty: Dr. Konduri Aditya

Details

Date:
27 Jul
Time:
2:30 PM -- 3:30 PM

Venue

Room No: 102 (Seminar Hall of CDS)