52 citations · 301 across the 27 of their papers we have counts for
27 papers
Non-Floquet oscillations of a parametrically driven rigid planar pendulum
Rebeka Sarkar, Krishna Kumar, Sugata Pratik Khastgir
The linear and nonlinear motions of a damped rigid planar pendulum, driven by vibrating its pivot sinusoidally, are reexamined. The pendulum is known to exhibit periodic, quasiperi…
Motion of a parametrically driven damped coplanar double pendulum
Rebeka Sarkar, Krishna Kumar, Sugata Pratik Khastgir
We present the results of linear stability of a damped coplanar double pendulum and its non-linear motion, when the point of suspension is vibrated sinusoidally in the vertical dir…
Frequency power spectra of global quantities in magnetoconvection
Sandip Das, Krishna Kumar
We present the results of direct numerical simulations of power spectral densities for kinetic energy, convective entropy and heat flux for unsteady Rayleigh-Bénard magnetoconvecti…
Rayleigh-Bénard magnetoconvection with temperature modulation
Suparna Hazra, Krishna Kumar, Saheli Mitra
Floquet analysis of modulated magnetoconvection in Rayleigh-Bénard\ geometry is performed. The temperature of the lower plate is varied sinusoidally in time about a finite mean. As…
Rhombic Patterns Near a Bicritical Point in Periodically Forced Surface Waves
Krishna Kumar, Supriyo Paul, Dharmesh Jain
We present here a study of selection of rhombic patterns close to a bicritical point at the onset of primary surface instability in viscous fluids under two-frequency vertical vibr…
Thermal flux in unsteady Rayleigh-Bénard magnetoconvection
Sandip Das, Krishna Kumar
We present results of numerical investigation on thermal flux in Rayleigh-Bénard magnetoconvection in the presence of a uniform vertical magnetic field. We have studied thermal flu…