A5074026365- Solar and Space Plasma Dynamics
- Advanced Materials and Mechanics
- Geomagnetism and Paleomagnetism Studies
- Micro and Nano Robotics
- Ionosphere and magnetosphere dynamics
- Structural Analysis and Optimization
- Fluid Dynamics and Turbulent Flows
- Elasticity and Material Modeling
- Characterization and Applications of Magnetic Nanoparticles
- Plant Molecular Biology Research
- Gas Dynamics and Kinetic Theory
- Meteorological Phenomena and Simulations
- Dynamics and Control of Mechanical Systems
- Plant Reproductive Biology
- Spacecraft Dynamics and Control
- Advanced Sensor and Energy Harvesting Materials
- Experimental and Theoretical Physics Studies
- Sports Performance and Training
- Sports Dynamics and Biomechanics
- Magnetic confinement fusion research
- Advanced Differential Equations and Dynamical Systems
- Soft Robotics and Applications
- Cellular Mechanics and Interactions
- Plant and Biological Electrophysiology Studies
- Plant and animal studies
Université Libre de Bruxelles
2008-2020
University of Oxford
2012-2017
Summary Understanding the processes that underlie pollen release is a prime target for controlling fertility to enable selective breeding and efficient production of hybrid crops. Pollen requires anther opening, which involves changes in biomechanical properties wall. In this research, we develop use mathematical model understand how these lead opening. Our describing biomechanics opening incorporates bilayer structure mature wall, comprises outer epidermal cell layer, whose turgor pressure...
Two low-dimensional magnetohydrodynamic models containing three velocity and magnetic modes are described. One of them (nonhelical model) has zero kinetic current helicity, while the other model (helical) nonzero helicity. The forced in both these models. These exhibit a dynamo transition at critical forcing amplitude that depends on Prandtl number. In nonhelical model, exists only for number beyond 1, helical exhibits all Although is far from reproducing possible features mechanisms, its...
During the last years, great progress was made in material science terms of concept, design and fabrication new composite materials with conferred properties desired functionalities. The scientific community paid particular interest to active soft materials, such as actuators, for their potential transducers responding various stimuli aiming produce mechanical work. Inspired by this, engineers today are developing multidisciplinary approaches matters, focusing on kinematics allowed itself...
The ballistic projection of the chameleon tongue is an extreme example quick energy release in animal kingdom. It relies on a complicated physiological structure and elaborate balance between tissue elasticity, collagen fibre anisotropy, active muscular contraction, stress geometry. A general biophysical model for dynamics based large deformation elasticity proposed. involves three distinct coupled subsystems: energetics intralingual sheaths, mechanics activating accelerator muscle...
A systematic procedure to derive shell models for magnetohydrodynamic turbulence is proposed. It takes into account the conservation of ideal quadratic invariants such as total energy, cross helicity, and magnetic well energy by advection term in induction equation. This approach also leads simple expressions exchanges unambiguous definitions fluxes. When applied existing with nonlinear interactions limited nearest-neighbor shells, this reproduces well-known but suggests a reinterpretation
A systematic study of the influence viscous effect on both spectra and nonlinear fluxes conserved as well nonconserved quantities in Navier–Stokes turbulence is proposed. This analysis used to estimate helicity dissipation scale which shown coincide with energy scale. However, it using decomposition into eigenmodes curl operator that effects have be taken account for wave vectors smaller than Kolmogorov number evolution these eigencomponents helicity.
A large family of deployable filamentary structures can be built by connecting two elastic rods along their length. The resulting structure has interesting shapes that stabilized tuning the material properties each rod. To model this and study its stability, we show equilibrium equations describing unloaded states derived from a variational principle. We then use novel geometric method to stability equilibria. As an example apply theory establish all possible equilibria Bristol ladder.
Given a functional for one-dimensional physical system, classical problem is to minimize it by finding stationary solutions and then checking the positive definiteness of second variation. Establishing is, in general, analytically untractable. However, we show here that global geometric analysis phase-plane trajectories associated with leads generic conditions minimality. These results provide straightforward direct proof definiteness, or lack thereof, many important cases. In particular,...
Using a helical shell model of turbulence, Chen et al. (2003) showed that both helicity and energy dissipate at the Kolmogorov scale, independently from any input. This is in contradiction with previous paper by Ditlevsen & Giuliani (2001) which, using GOY they found dissipates scale larger than does depend on In recent Lessinnes (2011), we this discrepancy due to fact only one mode (+ or −) present each instead modes model. Then, model, near cancellation flux between + − cannot occur small...
Micro-swimmers put into motion by a rotating magnetic field have provided interesting challenges both in engineering and mathematical modelling. We study here the dynamics of permanent-magnetic rigid body submitted to spatially-uniform steadily-rotating Stokes flow. This system depends on two external parameters: Ma- son number, which is proportional angular speed inversely magnitude field, conical angle between its axis rotation. work focuses asymptotic limits low high Mason limit angle....
A large family of deployable filamentary structures can be built by connecting two elastic rods along their length. The resulting structure has interesting shapes that stabilized tuning the material properties each rod. To model this and study its stability, we show equilibrium equations describing unloaded states derived from a variational principle. We then use novel geometric method to stability equilibria. As an example apply theory establish all possible equilibria Bristol ladder.
Pseudospectral Direct Numerical Simulation (DNS) has been performed to simulate dynamo transition for nonhelical magnetohydrodynamics turbulence. The numerical results are compared with a recent low-dimensional model [Verma et al. [13]]. forcing in DNS is the same as that used model. Dynamo observed DNS, but required higher than A qualitative similarity between and results. difference due presence of large number modes present DNS.
We revisit the dynamics of a permanent-magnetic rigid body submitted to spatially-uniform steadily-rotating magnetic field in Stokes flow. propose an analytical parameterisation full set equilibria depending on two key experimental parameters, and show how it brings further understanding that helps optimise magnetisation operating parameters. The system is often bistable when reaches its optimal swimming velocity. A handling strategy proposed guarantees correct equilibrium reached.