17 citations · 67 across the 21 of their papers we have counts for
21 papers
Lagrangian particles and particle clusters in large-aspect-ratio turbulent Rayleigh-Bénard convection experiment
Prafulla P. Shevkar, Mitanjali, Roshan J. Samuel +2
We perform Lagrangian particle-tracking experiments in turbulent Rayleigh-Bénard convection at aspect ratio Gamma = 10, Rayleigh number Ra = 9.3 x 10^7, and Prandtl number Pr = 4.8…
Circulation Statistics in Rayleigh-Bénard Convection
Giovanni Saisse, Roshan J. Samuel, Luca Moriconi +2
Important statistical properties of velocity circulation in homogeneous isotropic turbulence (HIT) have been unveiled in recent years, raising the question of whether they persist,…
Influence of plume activity on thermal convection in a rectangular cell
Ambrish Pandey, Jörg Schumacher, Matteo Parsani +1
We present three-dimensional direct numerical simulations of turbulent Rayleigh-Bénard convection in a closed rectangular box whose width and length are 0.8 and 2.4 tim…
Transient almost-invariant sets reveal convective heat transfer patterns in plane-layer Rayleigh-Bénard convection
Aleksandar Badza, Gary Froyland, Roshan J. Samuel +1
Horizontally extended plane-layer convection flows are characterized by characteristic patterns of turbulent heat transfer due to the convective fluid motion consisting of a nearly…
Extending the Duchon-Robert framework for anomalous dissipation to compressible fluid flows
Georgy Zinchenko, Jörg Schumacher
Anomalous dissipation, the persistence of a finite mean kinetic energy dissipation as the Reynolds number tends to infinity, occurs in flows with sufficiently spatially rough veloc…
Plane-layer Rayleigh-Bénard convection up to : Near-wall fluctuations and role of initial conditions
Roshan J. Samuel, Jörg Schumacher
We study turbulent Rayleigh-Bénard convection through direct numerical simulations in a three-dimensional plane layer of aspect ratio 4 for Rayleigh numbers $10^5 \leq Ra \leq 10^{…
Scale-resolved turbulent Prandtl number for Rayleigh-Bénard convection at
Shashwat Bhattacharya, Dmitry Krasnov, Ambrish Pandey +2
We present a framework to calculate the scale-resolved turbulent Prandtl number for the well-mixed and highly inertial bulk of a turbulent Rayleigh-Bénard mesoscale convecti…
Quantum-assisted tracer dispersion in turbulent shear flow
Julia Ingelmann, Fabian Schindler, Jörg Schumacher
We present a quantum-assisted generative algorithm for synthetic tracks of Lagrangian tracer particles in a turbulent shear flow. The parallelism and sampling properties of quantum…
Three-dimensional velocity gradient statistics in a mesoscale convection laboratory experiment
Prafulla P. Shevkar, Roshan J. Samuel, Christian Cierpka +1
We present three-dimensional velocity gradient statistics from Rayleigh--Bénard convection experiments in a horizontally extended cell of aspect ratio 25, a paradigm for mesoscale…
Diffuselet method for three-dimensional turbulent mixing of a cloudy air filament
Vladyslav Pushenko, Simone Scollo, Patrice Meunier +2
The mixing properties of vapor content, temperature and particle fields are of paramount importance in cloud turbulence as they pertain to essential processes, such as cloud water…
Effects of conjugate heat transfer on large-scale flow structures in convection
Matti Ettel, Philipp Patrick Vieweg, Jörg Schumacher
The constant temperature and constant heat flux thermal boundary conditions, both developing distinct flow patterns, represent limiting cases of ideally conducting and insulating p…
Deciphering boundary layer dynamics in high-Rayleigh-number convection using 3360 GPUs and a high-scaling in-situ workflow
Mathis Bode, Damian Alvarez, Paul Fischer +10
Turbulent heat and momentum transfer processes due to thermal convection cover many scales and are of great importance for several natural and technical flows. One consequence is t…
Slim multi-scale convolutional autoencoder-based reduced-order models for interpretable features of a complex dynamical system
Philipp Teutsch, Philipp Pfeffer, Mohammad Sharifi Ghazijahani +3
In recent years, data-driven deep learning models have gained significant interest in the analysis of turbulent dynamical systems. Within the context of reduced-order models (ROMs)…
Digital twin of a large-aspect-ratio Rayleigh-Bénard experiment: Role of thermal boundary conditions, measurement errors and uncertainties
Philipp Patrick Vieweg, Theo Käufer, Christian Cierpka +1
Albeit laboratory experiments and numerical simulations have proven themselves successful in enhancing our understanding of long-living large-scale flow structures in horizontally…
Numerical solution of nonlinear Schrödinger equation by a hybrid pseudospectral-variational quantum algorithm
Nikolas Köcher, Hendrik Rose, Sachin S. Bharadwaj +2
The time-dependent one-dimensional nonlinear Schrödinger equation (NLSE) is solved numerically by a hybrid pseudospectral-variational quantum algorithm that connects a pseudospectr…
Compressible turbulent convection: The role of temperature-dependent thermal conductivity and dynamic viscosity
John Panickacheril John, Jörg Schumacher
The impact of variable material properties, such as temperature-dependent thermal conductivity and dynamical viscosity, on the dynamics of a fully compressible turbulent convection…
No sustained mean velocity in the boundary region of plane thermal convection
Roshan J. Samuel, Mathis Bode, Janet D. Scheel +2
We study the dynamics of thermal and momentum boundary regions in three-dimensional direct numerical simulations of Rayleigh-Bénard convection for the Rayleigh number range $10^5 \…
Wall-attached convection under strong inclined magnetic fields
Shashwat Bhattacharya, Thomas Boeck, Dmitry Krasnov +1
We employ a linear stability analysis and direct numerical simulations to study the characteristics of wall-modes in thermal convection in a rectangular box under strong and inclin…
Compressible turbulent convection in highly stratified adiabatic background
John Panickacheril John, Jörg Schumacher
Buoyancy-driven turbulent convection leads to a fully compressible flow with a strong top-down asymmetry of first- and second-order statistics when the adiabatic equilibrium profil…
Connecting finite-time Lyapunov exponents with supersaturation and droplet dynamics in the bulk of a turbulent cloud
Vladyslav Pushenko, Jörg Schumacher
The impact of turbulent mixing on the droplet size distribution is studied deep inside a warm ice-free cloud. A simplified cloud mixing model was implemented therefore which summar…
Strongly superadiabatic and stratified limits of compressible convection
John Panickacheril John, Jörg Schumacher
Fully compressible turbulent convection beyond the Oberbeck-Boussinesq limit and anelastic regime is studied in three-dimensional numerical simulations. Superadiabaticity and d…