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Professor Parviz Moin, Director of the Center for Turbulence Research
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Surprises in Turbulence Convection

Professor Mahendra Verma, Department of Physics, IIT Kanpur

Event Details:

Friday, May 3, 2024
4:30pm - 5:30pm PDT

Location

United States

Location

Building 300, Room 300

Contact

This event is open to:

Alumni/Friends
Faculty/Staff
Members
Students

Abstract
 Fourier analysis of turbulent convection shows that large-scale plumes (not small-scale ones) drive the flow. This feature indicates that the kinetic energy flux increases marginally with wavenumbers, leading to Kolmogorov-like k^{-5/3} scaling (not Bolgiano-Obukhov scaling) for turbulent convection. Another surprise is that the viscous dissipation in turbulent convection is suppressed as (U^3/L)Ra^{-0.2}, where Ra is the Rayleigh number. This suppression is due to the walls and buoyancy. Recent simulations up to Rayleigh number of 10^{18} shows that Nussult number follows classical ⅓ scaling, thus indicating an absence of “ultimate regime”.

Speaker Bio
Prof. Mahendra Verma is at the Physics Department of IIT Kanpur. He is a recipient of J. C. Bose Fellowship, Swarnajayanti Fellowship, Dr. A.P.J. Abdul Kalam Cray HPC Award, and INSA Teachers Award. He is a fellow of the three Indian academies. His research interests are turbulence, high-performance computing, and complex systems. He authored several books, including “Energy Transfers in Fluid Flows”, “Physics of Buoyant Flows”, and “Practical Numerical Computing Using Python”.

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