Electromagnetic driving of the uids as the driving mechanism in electromagnetic pumps is of great interest in industry. On the other hand the uid ow in annulus has its own place in investigating the channel ow structure in the sense that we can use it as a model for a very long channel. So we…
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Slip over OTSSAM patterned surfaces
Superhydrophobic surfaces have shown to be able to strongly reduce the drag experienced by a liquid flowing on them with respect to flat solid surfaces1 . In the last years, it was apparent that a successful strategy to obtain superhydrophobic surfaces is to combine a micro/nano-texturing with the application of a hydrophobic coating. Under appropriate…
Linear stability analysis of a turbulent deep cavity
Unstable turbulent ows are widely encountered in engineering applications generally leading to perfomance reductions. We aim at characterising numerically the unstable dynamics of a turbulent ow using linear stability analysis in a global framework. The turbulent ow eld is computed using the Reynolds Average Navier-Stokes equations so that we focus on the unsteady dynamics of…
Heat transfer in sheared dilute suspensions: a Lattice-Boltzmann study
To study the influence of dispersed solid particles on the heat transfer in shear flows, we consider a laminar shear flow (plane Couette flow) between to parallel (nonslip) walls moving in opposite directions with the same speed. The walls are kept at fixed (and different) temperatures while the domain is double periodic in the plane…
Dynamics and stability of towed spheres
The dynamics of towed objects in a fluid environment is of interest for many practical situations. We investigate the stability of the trajectory of an object towed at the tip of the cable. We propose an experimental investigation of the Lagrangian dynamics of a spherical object towed at the tip of a cable. The towing…
Open-loop control of cavity ow oscillations with near-harmonic forcing
This talk deals with open-loop control of open cavity ows with harmonic forcings. Two-dimensional laminar open-cavity ows usually undergo a super-critical Hopf bifurcation at some critical Reynolds number: a global mode becomes unstable and its amplitude converges toward a limit-cycle. Such a behavior may accurately be captured by a Stuart-Landau equation, which governs the amplitude…
Non linear flow control using identified reduced order model
This study aims at controlling a self-sustained oscillator flow, with non linear low order model predictive control. The setup is purely numerical, nonetheless it aims at providing an experimentally suited process to model and control large scale, globally unstable flows. For this reason, system identification techniques will be used to design a reduced order model,…
Streaming Phenomena in the Ear
The inner ear is a complex sensory organ located in a cavity of the temporal bone. It is filled with two lymphatic fluids which are separated by a thin membrane (Figure 1). The inner ear can be split into a low-frequency system (balance sense) and a highfrequency system (hearing sense). The low-frequency system responds to…