Virtual Seminar "Dynamics and Patterns in Sheared Granular Fluid"

Dear All,

Mathematics, Mechanics, and Materials Unit (Fried Unit) would like to invite you to a Seminar by Prof. Meheboob Alam, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), India.

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Date: Wednesday, April 14, 2021
Time: 16:30-17:30
**Zoom session
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*Zoom information

Join Zoom Meeting
https://oist.zoom.us/j/93600723386?pwd=eS93V05YMHRhd2Y3SzZ5cDMyOGxPQT09

Meeting ID: 936 0072 3386
Passcode: 320768

Speaker:
Professor Meheboob Alam
Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR)

Title:
Dynamics and Patterns in Sheared Granular Fluid

Abstract:
In micro-structural fluids, the homogeneous shear flow is known to break into alternate regions of low and high shear rates (i.e. ``shear localization''), respectively, when the applied shear rate exceeds a critical value and this is known as gradient banding.  On the other hand, if the applied shear stress exceeds a critical value, the homogeneous flow separates into bands of different shear stresses  (having the same shear rate) along the vorticity (spanwise) direction, leading to ``stress localization'', and the resulting pattern is dubbed vorticity banding.  I will provide a brief overview of our work on nonlinear order-parameter theory to describe various pattern formation scenario in a sheared granular fluid, including an explanation of gradient- and vorticity-banding phenomena. The analysis holds for general constitutive model, but the results will be   presented for a kinetic-theory-based constitutive model that holds for rapid granular flows.

Biography:
Dr. Meheboob Alam  is currently a Professor (2012–) in the Engineering Mechanics Unit at Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Bangalore. He earned a Ph.D. degree (1998) in Mechanical Engineering from Indian Institute of Science, Bangalore. He was a Postdoctoral fellow at the University of California San Diego (Department of Applied Mechanics and Engineering Science, 1998–99) and at the University of Colorado Boulder (Department of Chemical Engineering, 1999-2000). He was an Alexander Humboldt fellow (2001–2002) at the University of Stuttgart (Department of Physics) before joining JNCASR (2003–).