Moritz Linkmann
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View article: Subcritical transition and multistability in liquid-metal magnetoconvection with sidewalls
Subcritical transition and multistability in liquid-metal magnetoconvection with sidewalls Open
The motionless conducting state of liquid-metal convection with an applied vertical magnetic field confined in a vessel with insulating sidewalls becomes linearly unstable to wall modes through a supercritical pitchfork bifurcation. Nevert…
View article: Subcritical transition and multistability in liquid metal magnetoconvection with sidewalls
Subcritical transition and multistability in liquid metal magnetoconvection with sidewalls Open
The motionless conducting state of liquid metal convection with an applied vertical magnetic field confined in a vessel with insulating side walls becomes linearly unstable to wall modes through a supercritical pitchfork bifurcation. Never…
View article: Narwhals and their blessings: exact coherent structures of elastic turbulence in channel flows
Narwhals and their blessings: exact coherent structures of elastic turbulence in channel flows Open
Solutions of long, flexible polymer molecules are complex fluids that simultaneously exhibit fluid-like and solid-like behaviour. When subjected to external flows, dilute polymer solutions develop elastic turbulence - a unique chaotic flow…
View article: Search for unstable relative periodic orbits in channel flow using symmetry-reduced dynamic mode decomposition
Search for unstable relative periodic orbits in channel flow using symmetry-reduced dynamic mode decomposition Open
In the dynamical systems approach to turbulence, unstable periodic orbits (UPOs) provide valuable insights into system dynamics. Such UPOs are usually found by shooting-based Newton searches, where constructing sufficiently accurate initia…
View article: TURB-MHD: an open-access database of forced homogeneous magnetohydrodynamic turbulence
TURB-MHD: an open-access database of forced homogeneous magnetohydrodynamic turbulence Open
We present TURB-MHD, a database formed by six datasets of three-dimensional incompressible homogeneous magnetohydrodynamic turbulence maintained by a large-scale random forcing with minimal injection of cross helicity. Five of them describ…
View article: Heat transport model for the transition between scaling regimes in quasistatic and full magnetoconvection
Heat transport model for the transition between scaling regimes in quasistatic and full magnetoconvection Open
In magnetoconvection, the flow is governed by the interplay between gravitational buoyancy and the Lorentz force, with one of these forces dominating in different regimes. In this paper, we develop a model with a single adjustable paramete…
View article: Energy flux decomposition in magnetohydrodynamic turbulence
Energy flux decomposition in magnetohydrodynamic turbulence Open
In hydrodynamic (HD) turbulence, an exact decomposition of the energy flux across scales has been derived that identifies the contributions associated with vortex stretching and strain self-amplification (Johnson, Phys. Rev. Lett. , vol. 1…
View article: Identifying regions of importance in wall-bounded turbulence through explainable deep learning
Identifying regions of importance in wall-bounded turbulence through explainable deep learning Open
Despite its great scientific and technological importance, wall-bounded turbulence is an unresolved problem in classical physics that requires new perspectives to be tackled. One of the key strategies has been to study interactions among t…
View article: TURB-Hel: an open-access database of helically forced homogeneous and isotropic turbulence
TURB-Hel: an open-access database of helically forced homogeneous and isotropic turbulence Open
We present TURB-Hel, a database formed by two datasets of incompressible homogeneous and isotropic turbulence, maintained in a statistically stationary state by fully helical forcing. The aim is to provide a dataset that clearly exhibits t…
View article: Purely elastic turbulence in pressure-driven channel flows
Purely elastic turbulence in pressure-driven channel flows Open
Solutions of long, flexible polymer molecules are complex fluids that simultaneously exhibit fluid-like and solid-like behavior. When subjected to an external flow, dilute polymer solutions exhibit elastic turbulence—a unique, chaotic flow…
View article: Energy Flux Decomposition in Magnetohydrodynamic Turbulence
Energy Flux Decomposition in Magnetohydrodynamic Turbulence Open
In hydrodynamic (HD) turbulence an exact decomposition of the energy flux across scales has been derived that identifies the contributions associated with vortex stretching and strain self-amplification (P. Johnson, Phys. Rev. Lett., 124, …
View article: Unifying heat transport model for the transition between buoyancy-dominated and Lorentz-force-dominated regimes in quasistatic magnetoconvection
Unifying heat transport model for the transition between buoyancy-dominated and Lorentz-force-dominated regimes in quasistatic magnetoconvection Open
In magnetoconvection, the flow of an electromagnetically conductive fluid is driven by a combination of buoyancy forces, which create the fluid motion due to thermal expansion and contraction, and Lorentz forces, which distort the convecti…
View article: Purely elastic turbulence in pressure-driven channel flows
Purely elastic turbulence in pressure-driven channel flows Open
Solutions of long, flexible polymer molecules are complex fluids that simultaneously exhibit fluid-like and solid-like behaviour. When subjected to an external flow, dilute polymer solutions exhibit elastic turbulence - a unique, chaotic f…
View article: Effects of anisotropy on the geometry of tracer particle trajectories in turbulent flows
Effects of anisotropy on the geometry of tracer particle trajectories in turbulent flows Open
Using curvature and torsion to describe Lagrangian trajectories gives a full description of these as well as an insight into small and large time scales as temporal derivatives up to order 3 are involved. One might expect that the statisti…
View article: Wall mode dynamics and transition to chaos in magnetoconvection with a vertical magnetic field
Wall mode dynamics and transition to chaos in magnetoconvection with a vertical magnetic field Open
Quasistatic magnetoconvection of a low Prandtl number fluid ($\textrm{Pr}=0.025)$ with a vertical magnetic field is considered in a unit aspect ratio box with no-slip boundaries. At high relative magnetic field strengths, given by the Hart…
View article: Unifying heat transport model for the transition between buoyancy-dominated and Lorentz-force-dominated regimes in quasistatic magnetoconvection
Unifying heat transport model for the transition between buoyancy-dominated and Lorentz-force-dominated regimes in quasistatic magnetoconvection Open
In magnetoconvection, the flow of electromagnetically conductive fluid is driven by a combination of buoyancy forces, which create the fluid motion due to thermal expansion and contraction, and Lorentz forces, which distort the convective …
View article: Space Weather Modeling and Prediction for Intermediate Time-scales
Space Weather Modeling and Prediction for Intermediate Time-scales Open
Whitepaper #097 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: space weather applications; basic research. Additional topics: space weather research/operations/research loop; ground-based missions/…
View article: Explaining wall-bounded turbulence through deep learning
Explaining wall-bounded turbulence through deep learning Open
Despite its great scientific and technological importance, wall-bounded turbulence is an unresolved problem that requires new perspectives to be tackled. One of the key strategies has been to study interactions among the coherent structure…
View article: New exact Betchov-like relation for the helicity flux in homogeneous turbulence
New exact Betchov-like relation for the helicity flux in homogeneous turbulence Open
In homogeneous and isotropic turbulence, the relative contributions of different physical mechanisms to the energy cascade can be quantified by an exact decomposition of the energy flux (Johnson, Phys. Rev. Lett. , vol. 124, 2020, 104501; …
View article: Linear stability analysis of purely elastic travelling-wave solutions in pressure-driven channel flows
Linear stability analysis of purely elastic travelling-wave solutions in pressure-driven channel flows Open
Recent studies of pressure-driven flows of dilute polymer solutions in straight channels demonstrated the existence of two-dimensional coherent structures that are disconnected from the laminar state and appear through a subcritical bifurc…
View article: Effects of anisotropy on the geometry of tracer particle trajectories in turbulent flows
Effects of anisotropy on the geometry of tracer particle trajectories in turbulent flows Open
Using curvature and torsion to describe Lagrangian trajectories gives a full description of these as well as an insight into small and large time scales as temporal derivatives up to order 3 are involved. One might expect that the statisti…
View article: Identifying regions of importance in wall-bounded turbulence through explainable deep learning
Identifying regions of importance in wall-bounded turbulence through explainable deep learning Open
Despite its great scientific and technological importance, wall-bounded turbulence is an unresolved problem in classical physics that requires new perspectives to be tackled. One of the key strategies has been to study interactions among t…
View article: Symmetry-reduced low-dimensional representation of large-scale dynamics in the asymptotic suction boundary layer
Symmetry-reduced low-dimensional representation of large-scale dynamics in the asymptotic suction boundary layer Open
An important feature of turbulent boundary layers are persistent large-scale coherent structures in the flow. Here, we use Dynamic Mode Decomposition (DMD), a data-driven technique designed to detect spatio-temporal coherence, to construct…
View article: New Exact Betchov-like Relation for the Helicity Flux in Homogeneous Turbulence
New Exact Betchov-like Relation for the Helicity Flux in Homogeneous Turbulence Open
In homogeneous and isotropic turbulence, the relative contributions of different physical mechanisms to the energy cascade can be quantified by an exact decomposition of the energy flux (P. Johnson, Phys. Rev. Lett., 124, 104501 (2020), J.…