Virtual Seminar "Dynamics and Patterns in Sheared Granular Fluid"

Date

Wednesday, April 14, 2021 - 16:30 to 17:30

Zoom

Description

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–).

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