69 citations · 232 across the 19 of their papers we have counts for
19 papers
Mach-number-dependent dissipative anomaly in isothermal compressible turbulence
Shadab Alam, Georgy Zinchenko, Christoph Federrath +1
Using a comprehensive set of three-dimensional, high-resolution direct numerical simulations, we investigate the existence of a dissipative anomaly in isothermal, homogeneous, isot…
Vortex promoters in MHD duct flow
Andreu Queralt, Dmitry Krasnov, Yuri Kolesnikov +1
We use 3D direct numerical simulations to study the effects of vortex promoters in liquid metal duct flow to sustain Q2D states which are formed in the presence of strong magnetic…
Lagrangian single-particle, multi-particle and topological analyses in turbulent Rayleigh-Bénard convection
Matti Ettel, Roshan J. Samuel, Michael Chertkov +1
We present three-dimensional direct numerical simulations of turbulent Rayleigh-Bénard convection (RBC) in the Lagrangian frame of reference for Rayleigh numbers $10^5 \leq Ra \leq…
Heat transport in magnetohydrodynamic duct flow regimes with conducting and insulating walls
Andreu Queralt McBride, Dmitry Krasnov, Yuri Kolesnikov +1
The flow of a liquid metal (LM) in a rectangular duct segment, subject to a uniform transverse magnetic field and uniform heating at the side walls is explored in an ample paramete…
Transition to dilatation-dominated isothermal compressible turbulence
Shadab Alam, Christoph Federrath, Jörg Schumacher
The kinetic energy dissipation rate is of central importance for small-scale statistics in turbulent flows. Here, we report a transition to the dilatation-dominated regime of three…
Turbulent mesoscale convection in the Boussinesq limit and beyond
Shadab Alam, Dmitry Krasnov, Ambrish Pandey +4
Mesoscale convection covers an intermediate scale range between small-scale turbulence and the global organization of the convection flow. It is often characterized by an order of…
Collective variables between large-scale states in turbulent convection
Priyanka Maity, Andreas Bittracher, Péter Koltai +1
The dynamics in a confined turbulent convection flow is dominated by multiple long-lived macroscopic circulation states, which are visited subsequently by the system in a Markov-ty…
Lagrangian studies of coherent sets and heat transport in constant heat flux-driven turbulent Rayleigh-Bénard convection
Philipp P. Vieweg, Anna Klünker, Jörg Schumacher +1
We explore the mechanisms of heat transfer in a turbulent constant heat flux-driven Rayleigh-Bénard convection flow, which exhibits a hierarchy of flow structures from granules to…
Thermal boundary condition studies in large aspect ratio Rayleigh-Bénard convection
Theo Käufer, Philipp P. Vieweg, Jörg Schumacher +1
We study the influence of thermal boundary conditions on large aspect ratio Rayleigh-Bénard convection by a joint analysis of experimental and numerical data sets for a Prandl numb…
Effects of strong fringing magnetic fields on turbulent thermal convection
Shashwat Bhattacharya, Thomas Boeck, Dmitry Krasnov +1
We study the influence of fringing magnetic fields on turbulent thermal convection in a horizontally extended rectangular domain. The magnetic field is created in the gap between t…
Similarities between characteristics of convective turbulence in confined and extended domains
Ambrish Pandey, Dmitry Krasnov, Jörg Schumacher +2
To understand turbulent convection at very high Rayleigh numbers typical of natural phenomena, computational studies in slender cells are an option if the needed resources have to…
Inverse cascades of kinetic energy and thermal variance in three-dimensional horizontally extended turbulent convection
Philipp P. Vieweg, Janet D. Scheel, Rodion Stepanov +1
Inverse cascades of kinetic energy and thermal variance in the subset of vertically homogeneous modes in spectral space are found to cause a slow aggregation to a pair of convectiv…
Hybrid quantum-classical reservoir computing of thermal convection flow
Philipp Pfeffer, Florian Heyder, Jörg Schumacher
We simulate the nonlinear chaotic dynamics of Lorenz-type models for a classical two-dimensional thermal convection flow with 3 and 8 degrees of freedom by a hybrid quantum--classi…
Non-Boussinesq convection at low Prandtl numbers relevant to the Sun
Ambrish Pandey, Jörg Schumacher, Katepalli R. Sreenivasan
Convection in the Sun occurs at Rayleigh numbers, , as high as , molecular Prandtl numbers, , as low as , under conditions that are far from satisfying th…
Echo State Network for two-dimensional turbulent moist Rayleigh-Bénard convection
Florian Heyder, Jörg Schumacher
Recurrent neural networks are machine learning algorithms which are suited well to predict time series. Echo state networks are one specific implementation of such neural networks…
Lagrangian heat transport in turbulent three-dimensional convection
Philipp P. Vieweg, Christiane Schneide, Kathrin Padberg-Gehle +1
Spatial regions that do not mix effectively with their surroundings and thus contribute less to the heat transport in fully turbulent three-dimensional Rayleigh-Bénard flows are id…
Fractal iso-level sets in high-Reynolds-number scalar turbulence
Kartik P. Iyer, Jörg Schumacher, Katepalli R. Sreenivasan +1
We study the fractal scaling of iso-levels sets of a passive scalar mixed by three-dimensional homogeneous and isotropic turbulence at high Reynolds numbers. The Schmidt number is…
Lagrangian coherent sets in turbulent Rayleigh-Bénard convection
Christiane Schneide, Martin Stahn, Ambrish Pandey +4
Coherent circulation rolls and their relevance for the turbulent heat transfer in a two-dimensional Rayleigh--Bénard convection model are analyzed. The flow is in a closed cell of…
Simulation of flux expulsion and associated dynamics in a two-dimensional magnetohydrodynamic channel flow
Vinodh Bandaru, Julian Pracht, Thomas Boeck +1
We consider a plane channel flow of an electrically conducting fluid which is driven by a mean pressure gradient in the presence of an applied magnetic field that is streamwise per…