Suppressing vortex generation in ferrofluidic Couette flow via alternating magnetic fields

Article Multidisciplinary Sciences

Ferrofluidic wavy Taylor vortices under alternating magnetic field

Sebastian A. Altmeyer

Summary: This study investigates the impact of frequency modulation on nonlinear flow dynamics and resonant phenomena in ferrofluidic wavy vortex flow in Taylor-Couette geometry.

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES (2023)

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Article Materials Science, Multidisciplinary

Ferrofluidic Couette flow in time-varying magnetic field

Sebastian Altmeyer

Summary: This study investigates the ferrofluidic Couette flow between counter-rotating cylinders subject to time-periodic modulation in a spatially homogeneous magnetic field. The research reveals that modulation can significantly enhance the inner Reynolds number and affect the stability and nonlinear oscillations. The complex system response and flow dynamics are observed around the stability thresholds of bistable co-existing solutions.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS (2022)

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Article Mechanics

Increasing Flow Complexity in Time-Dependent Modulated Ferrofluidic Couette Flow

S. Altmeyer

Summary: This study presents numerical simulations of ferrofluidic Couette flow under a spatially homogeneous magnetic field with time-periodic modulation. The modulation enhances the inner Reynolds number (Re-i) for primary bifurcating solutions and increases the complexity of the different solutions with the introduced modulation frequency.

FLUID DYNAMICS (2022)

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Article Physics, Fluids & Plasmas

Effect of Axial and Radial Flow on the Hydrodynamics in a Taylor Reactor

Sebastian A. Altmeyer

Summary: This paper investigates the impact of combined axial through flow and radial mass flux on Taylor-Couette flow in a counter-rotating configuration. The results show that the radial mass flux has a significant influence on the symmetry and torque of the flow structures, and also reveal the existence of oscillating heteroclinic connections between unstable and topologically different flow structures.

FLUIDS (2022)

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Article Multidisciplinary Sciences

On the ridge of instability in ferrofluidic Couette flow via alternating magnetic field

Sebastian Altmeyer

Summary: Numerical simulations of ferrofluidic Couette flow under time-periodic modulation reveal that such modulation can significantly enhance the Reynolds number, and an alternating field can trigger the system to transition from subcritical to supercritical. This discovery provides a framework for studying other types of magnetic flows driven by time-dependent forcing.

SCIENTIFIC REPORTS (2021)

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Article Chemistry, Physical