50 citations · 202 across the 16 of their papers we have counts for
16 papers
Energy spectra of buoyancy-driven bubbly flow in a vertical Hele-Shaw cell
Rashmi Ramadugu, Vikash Pandey, Prasad Perlekar
We present direct numerical simulations (DNS) study of confined buoyancy-driven bubbly flows in a Hele-Shaw setup. We investigate the spectral properties of the flow and make compa…
Hidden jerk in universal creep and aftershocks
Vikash Pandey
Most materials exhibit creep memory under the action of a constant load. The memory behavior is governed by Andrade's creep law, which also has an inherent connection with the Omor…
Kolmogorov Turbulence Coexists with Pseudo-Turbulence in Buoyancy-Driven Bubbly Flows
Vikash Pandey, Dhrubaditya Mitra, Prasad Perlekar
We investigate spectral properties of buoyancy driven bubbly flows. Using high-resolution numerical simulations and phenomenology of homogeneous turbulence, we identify the relevan…
Comment on "Nonlinear charge--voltage relationship in constant phase element" [AEU-Int. J. Electron. Commun. 117, 153104 (2020)]
Vikash Pandey
In this comment, we show a dimensional inconsistency that plagues one of the main founding equations, Eq. (5), of the manuscript, [Fouda et al., AEU-Int. J. Electron. Commun. 117,…
Rate of formation of caustics in heavy particles advected by turbulence
Akshay Bhatnagar, Vikash Pandey, Prasad Perlekar +1
The rate of collision and the relative velocities of the colliding particles in turbulent flows is a crucial part of several natural phenomena, e.g., rain formation in warm clouds…
Turbulence modulation in buoyancy-driven bubbly flows
Vikash Pandey, Dhrubaditya Mitra, Prasad Perlekar
We present a Direct Numerical Simulation (DNS) study of buoyancy-driven bubbly flows in the presence of large scale driving that generates turbulence. On increasing the turbulence…
Paths to caustic formation in turbulent aerosols
Jan Meibohm, Vikash Pandey, Akshay Bhatnagar +4
The dynamics of small, yet heavy, identical particles in turbulence exhibits singularities, called caustics, that lead to large fluctuations in the spatial particle-number density,…
Charge-voltage relation for a universal capacitor
Vikash Pandey
Most capacitors do not satisfy the conventional assumption of a constant capacitance. They exhibit memory which is often described by a time-varying capacitance. It is shown that t…
Origin of the Curie-von Schweidler law and the fractional capacitor from time-varying capacitance
Vikash Pandey
Most dielectrics of practical purpose exhibit memory and are described by the century-old Curie-von Schweidler law. Interestingly, the Curie-von Schweidler law is the motivation be…
Liquid velocity fluctuations and energy spectra in three-dimensional buoyancy driven bubbly flows
Vikash Pandey, Rashmi Ramadugu, Prasad Perlekar
We present a direct numerical simulation (DNS) study of pseudo-turbulence in buoyancy driven bubbly flows for a range of Reynolds ($\Rey$) and Atwood ($\At$) numbers. We study the…
Clustering and energy spectra in two-dimensional dusty gas turbulence
Vikash Pandey, Dhrubaditya Mitra, Prasad Perlekar
We present Direct Numerical Simulation (DNS) of heavy inertial particles (dust) immersed in two-dimensional turbulent flow (gas). The dust are modeled as mono-dispersed heavy parti…
Asymmetricity and sign reversal of secondary Bjerknes force from strong nonlinear coupling in cavitation bubble pairs
Vikash Pandey
Most of the current applications of acoustic cavitation use bubble clusters that exhibit multibubble dynamics. This necessitates a complete understanding of the mutual nonlinear co…
Pseudo-turbulence in two-dimensional buoyancy driven bubbly flows: a DNS study
Rashmi Ramadugu, Vikash Pandey, Prasad Perlekar
We present a direct numerical simulation (DNS) study of buoyancy driven bubbly flows in two-dimensions. We employ volume of fluid (VOF) method to track the bubble interface. To inv…
Connecting the grain-shearing mechanism of wave propagation in marine sediments to fractional order wave equations
Vikash Pandey, Sverre Holm
The characteristic time-dependent viscosity of the intergranular pore-fluid in Buckingham's grain-shearing (GS) model [Buckingham, J. Acoust. Soc. Am. 108, 2796-2815 (2000)] is ide…
Connecting the grain-shearing mechanism of wave propagation in marine sediments to fractional calculus
Vikash Pandey, Sverre Holm
An analogy is drawn between the diffusion-wave equations derived from the fractional Kelvin-Voigt model and those obtained from Buckingham's grain-shearing (GS) model [J. Acoust. S…
Spatial dispersion of elastic waves in a bar characterized by tempered nonlocal elasticity
Vikash Pandey, Sven Peter Näsholm, Sverre Holm
We apply the framework of tempered fractional calculus to investigate the spatial dispersion of elastic waves in a one-dimensional elastic bar characterized by range-dependent nonl…