Markus Holzner
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View article: Experimental Validation of Large Eddy Simulation as a Benchmark for Reynolds-Averaged Navier-Stokes Flow Modeling in a Magnetically Levitated Blood Pump
Experimental Validation of Large Eddy Simulation as a Benchmark for Reynolds-Averaged Navier-Stokes Flow Modeling in a Magnetically Levitated Blood Pump Open
Purpose This study investigates the potential of large eddy simulation (LES) as a benchmark for validating Reynolds-averaged Navier-Stokes (RANS) models in the CentriMag centrifugal blood pump. We compare velocity field predictions from LE…
View article: Salmonids elicit an acute behavioral response to heterothermal environments
Salmonids elicit an acute behavioral response to heterothermal environments Open
Most fish species are ectothermic and rely on behavioral strategies to control their body temperature in heterothermal environments. Both thermotaxis and thermokinesis have been suggested as important underlying mechanisms. However, to wha…
View article: Modal analysis reveals imprint of snowflake shape on wake flow structures
Modal analysis reveals imprint of snowflake shape on wake flow structures Open
This study investigates the complex interplay of wake flow dynamics, particle shape, and falling behavior of snowflakes through advanced flow analysis. We employ Proper Orthogonal Decomposition and Dynamic Mode Decomposition to analyze the…
View article: Fluid structure interaction in pulsatile flow through an elastic pipe segment
Fluid structure interaction in pulsatile flow through an elastic pipe segment Open
Fluid-structure interaction (FSI) in elastic vessels occurs in a wide range of systems in nature and technology. A difficulty in the development and validation of FSI models is the lack of quantitative measurements of vessel response to un…
View article: In-flow measurement of molecular diffusion coefficients using differential dynamic microscopy
In-flow measurement of molecular diffusion coefficients using differential dynamic microscopy Open
Understanding diffusive mass transport in fluid flows is fundamental in several fields, ranging from virus particles in chromatographic test kits to nutrients in ocean currents. However, experimentally resolving diffusion processes in flow…
View article: Drag reduction utilizing a wall-attached ferrofluid film in turbulent channel flow
Drag reduction utilizing a wall-attached ferrofluid film in turbulent channel flow Open
This study explores the application of a wall-attached ferrofluid film to decrease skin-friction drag in turbulent channel flow. We conduct experiments using water as a working fluid in a turbulent channel flow set-up, where one wall is co…
View article: Bubble-induced convection and flow instability in liquid vessels
Bubble-induced convection and flow instability in liquid vessels Open
Buoyancy-driven bubbly flows play pivotal roles in various scenarios, such as the oxygenation and mixing in the upper ocean and the reaction kinetics in chemical and bio-reactors. This work focuses on the convective flow induced by the loc…
View article: Fine-scale movement response of juvenile brown trout to hydropeaking
Fine-scale movement response of juvenile brown trout to hydropeaking Open
Juvenile fish are known to be the most impacted during hydropeaking events due to stranding or uncontrolled drift resulting from changes to water depth and flow velocity. To shed light on their response to such hydraulic alterations, we co…
View article: Salmonids elicit an acute behavioral response to heterothermal environments
Salmonids elicit an acute behavioral response to heterothermal environments Open
Most fish species are ectothermic and rely on behavioral strategies to control their body temperature in heterothermal environments. Both thermotaxis and thermokinesis have been suggested as important underlying mechanisms. However, to wha…
View article: Salmonids elicit an acute behavioral response to heterothermal environments
Salmonids elicit an acute behavioral response to heterothermal environments Open
Most fish species are ectothermic and rely on behavioral strategies to control their body temperature in heterothermal environments. Both thermotaxis and thermokinesis have been suggested as important underlying mechanisms. However, to wha…
View article: Modal analysis reveals imprint of snowflake shape on wake flow structures
Modal analysis reveals imprint of snowflake shape on wake flow structures Open
This study investigates the complex interplay of wake flow structures, particle shape, and falling behavior of snowflakes through advanced flow analysis. We employ Proper Orthogonal Decomposition and Dynamic Mode Decomposition to analyze t…
View article: Salmonids elicit an acute behavioral response to heterothermal environments
Salmonids elicit an acute behavioral response to heterothermal environments Open
Most fish species are ectothermic and rely on behavioral strategies to control their body temperature in heterothermal environments. Both thermotaxis and thermokinesis have been suggested as important underlying mechanisms. However, to wha…
View article: Impact of an immobile, mobile and permeable phase on mixing-driven reactions in porous media
Impact of an immobile, mobile and permeable phase on mixing-driven reactions in porous media Open
Understanding chemicals mixing and reactions in porous media is critical for many environmental and industrial applications. In the presence of a non-wetting immiscible phase (e.g., gas) within the pore space, it can remain immobile, givin…
View article: Immiscible Rayleigh–Taylor turbulence: Implications for bacterial degradation in oil spills
Immiscible Rayleigh–Taylor turbulence: Implications for bacterial degradation in oil spills Open
An unstable density stratification between two fluids mixes spontaneously under the effect of gravity, a phenomenon known as Rayleigh–Taylor (RT) turbulence. If the two fluids are immiscible, for example, oil and water, surface tension pre…
View article: Drag reduction utilizing a wall-attached ferrofluid film in turbulent channel flow
Drag reduction utilizing a wall-attached ferrofluid film in turbulent channel flow Open
This study explores the application of a wall-attached ferrofluid film to decrease skin friction drag in turbulent channel flow. We conduct experiments using water as a working fluid in a turbulent channel flow setup, where one wall is coa…
View article: In vitro investigation of the blood flow downstream of a 3D-printed aortic valve
In vitro investigation of the blood flow downstream of a 3D-printed aortic valve Open
The hemodynamics in the aorta as well as the durability of aortic valve prostheses vary greatly between different types of devices. Although placement and sizing of surgical aortic valve prostheses are excellent, the valve geometry of comm…
View article: Bubble-induced convection and flow-instability in a soft reactor
Bubble-induced convection and flow-instability in a soft reactor Open
Buoyancy-driven bubbly flows play pivotal roles in various scenarios, such as the oxygenation and mixing in the upper ocean and the reaction kinetics in chemical and bio-reactors. This work focuses on the convective flow induced by the loc…
View article: Entrainment, detrainment and enstrophy transport by small-scale vortex structures
Entrainment, detrainment and enstrophy transport by small-scale vortex structures Open
The interaction of small-scale vortical structures with the surrounding fluid are studied using a fully resolved three-dimensional experimental data set of homogeneous turbulence measured at the centre of a von Kármán mixing flow facility …
View article: Global warming accelerates soil heterotrophic respiration
Global warming accelerates soil heterotrophic respiration Open
Raw data of the microfluidic experiments of the drainage process in three porous media configurations. For more details, see our paper: Nissan et al., (2023) Global warming accelerates soil heterotrophic respiration (Under consideration, N…
View article: Global warming accelerates soil heterotrophic respiration
Global warming accelerates soil heterotrophic respiration Open
Carbon efflux from soils is the largest terrestrial carbon source to the atmosphere, yet it remains one of the most uncertain fluxes in the Earth’s carbon budget. A dominant component of this flux is heterotrophic respiration, influe…
View article: Global warming accelerates soil heterotrophic respiration
Global warming accelerates soil heterotrophic respiration Open
Carbon efflux from soils is the largest terrestrial carbon source to the atmosphere, yet it remains one of the most uncertain fluxes in the Earth’s carbon budget. A dominant component of this flux is heterotrophic respiration, influenced b…