General audience seminar - Abhishek Dhar

  • Research
Published on April 14, 2023 Updated on April 14, 2023

on the April 25, 2023

2:30 pm

Campus Ecovalley

INPHYNI - Main Seminar Room (3rd Floor)

Blast and Splash in a one-dimensional cold gas

We study the response of an infinite system of point particles on the real line, initially at rest, to the instantaneous release of energy in a localized region. The blast generates shock fronts that travel sub-ballistically. The density, velocity, and temperature profiles in the growing region between the shock fronts can be obtained from  exact self-similar solutions of the Euler equations. We compare these with the results of direct microscopic simulations. At long times,  the results obtained from the microscopic dynamics show a remarkable agreement with the  predictions from Euler hydrodynamics except at the blast core  where we show that corrections  due to Navier-Stokes terms are  important. We will also discuss the "splash" problem where energy is injected from one side of a semi-infinite cold gas.