A5070203003- Fluid Dynamics and Heat Transfer
- Fluid Dynamics and Mixing
- Particle Dynamics in Fluid Flows
- Ocean Waves and Remote Sensing
- Fluid Dynamics Simulations and Interactions
- Fluid Dynamics and Thin Films
- Spacecraft and Cryogenic Technologies
- Nonlinear Dynamics and Pattern Formation
- Surface Modification and Superhydrophobicity
- Coastal and Marine Dynamics
- Electrohydrodynamics and Fluid Dynamics
- Fluid Dynamics and Turbulent Flows
- Lattice Boltzmann Simulation Studies
- Cyclone Separators and Fluid Dynamics
- Advanced Mathematical Modeling in Engineering
- Vibration and Dynamic Analysis
- Micro and Nano Robotics
- Aerodynamics and Acoustics in Jet Flows
- Aquatic and Environmental Studies
- Meteorological Phenomena and Simulations
- Fluid Dynamics and Vibration Analysis
- Oceanographic and Atmospheric Processes
- Characterization and Applications of Magnetic Nanoparticles
- Tropical and Extratropical Cyclones Research
- Methane Hydrates and Related Phenomena
Princeton University
2022-2024
Indian Institute of Technology Roorkee
2024
Indian Institute of Technology Bombay
2017-2020
We perform direct numerical simulations of a gas bubble dissolving in surrounding liquid. The volume is reduced due to dissolution the gas, with implementation an immersed boundary method, coupling diffusion and Navier–Stokes equations. methods are validated against planar spherical geometries’ analytical moving problems, including classic Epstein–Plesset problem. Considering rising quiescent liquid, we show that mass transfer coefficient $k_L$ can be described by Levich formula $k_L =...
We investigate drop break-up morphology, occurrence, time and size distribution, through large ensembles of high-fidelity direct-numerical simulations drops in homogeneous isotropic turbulence, spanning a wide range parameters terms the Weber number $We$ , viscosity ratio between carrier flow $\mu _r=\mu _d/\mu _l$ where d is diameter, Reynolds ( $Re$ ) number. For _r \leq 20$ we find nearly constant critical while it increases with _r$ (and when > transition can be described The delayed...
We study axisymmetric, free oscillations driven by gravity and surface tension at the interface of two viscous, immiscible, radially unbounded fluids, analytically numerically. The is perturbed as a zeroth-order Bessel function (in space) its evolution obtained time. In linearised approximation, we solve initial value problem (IVP) to obtain an analytic expression for time wave amplitude. It shown that mode temporally evolves in exactly same manner Fourier planar geometry. novel analytical...
Abstract
Abstract
We perform linear stability analysis of an interface separating two immiscible, inviscid, quiescent fluids subject to a time-periodic body force. In generalised, orthogonal coordinate system, the time-dependent amplitude interfacial perturbations, in form standing waves, is shown be governed by generalised Mathieu equation. For zero forcing, equation reduces (generalised) simple harmonic oscillator The govern Faraday waves on four base states. use this demonstrate that and instabilities can...
We describe the rising trajectory of bubbles in isotropic turbulence and quantify slowdown mean rise velocity with sizes within inertial subrange. perform direct numerical simulations bubbles, for a wide range intensity, bubble inertia deformability, systematic comparison corresponding quiescent case, Reynolds number at Taylor microscale from 38 to 77. Turbulent fluctuations randomise cause reduction $\tilde {w}_b$ compared flow $w_b$ . The decrease {w}_b/w_b$ is shown be primarily function...
This paper is associated with a poster winner of 2021 American Physical Society's Division Fluid Dynamics (DFD) Milton van Dyke Award for work presented at the DFD Gallery Motion. The original available online Motion, https://doi.org/10.1103/APS.DFD.2021.GFM.P0005.
Direct Numerical Simulations performed using the open source PDE solver Basilisk [Popinet and Collaborators, http://basilisk.fr,2022] for a viscous droplet in homogeneous isotropic turbulent flow (Re λλ = 150, µ drop /µ contrr 200).The figures show absolute vorticity on plane background time evolution of droplet's interface.The undergoes elongation before breaking to produce very small child droplets.We would like acknowledge high-performance computing support from supercomputer Quriosity...