Call for post-doctoral students n°2

• Topic supervised by Gautier VERHILE (IRPHE) & Fabien CANDELIER (IUSTI)

Particle clustering is a key parameter to model aggregation in turbulent flows. For heavy spherical particles, it has been shown that this phenomenon is mainly due to centrifugal forces which expel particles form high vortical regions. For thin flexible particles, the situation seems more complex. Their deformability allows the particle to wrap around the vortex core to follow the streamline. This shape is related to a difference of pressure from each side of the particles, the pressure being higher farther from the vortex core. This pressure difference is responsible of a net force that pushes the particle toward the vortex core. The balance of this net force and the centrifugal force might be at the origin of a new equilibrium distance from the vortex core (...)

• Topic supervised by Lounès TADRIST (IUSTI), Irina MARTIN (IUSTI) & Maxime CHINAUD (IUSTI)

Energy conversion systems and faculties generally involve heat. To ensure proper operation of these systems, the heat generated must be controlled by creating appropriate fluidic architectures. Numerous techniques have been implemented to ensure heat transfer at the interface between a wall and a fluid (...)

• Topic supervised by Patrice LE GAL (IRPHE), Benjamin FAVIER (IRPHE), Stephane VIAZZO (M2P2) & Uwe HARLANDER (BTU)

In the various examples mentioned above, which are particularly relevant to understanding the transition to turbulence in stratified geophysical flows, instabilities arise through the resonance of internal waves propagating in the sheared fluid [2,3,4]. In the case of Poiseuille flow, it is the Tollmien-Schlichting waves interacting with gravity waves that give rise to the instability. For strato-rotational instability, it's an interaction of gravito-inertial waves trapped at the walls, while baroclinic instability can be interpreted as the resonance of Rossby waves propagating on vertically separated layers (...)

• Topic supervised by Christophe ALMARCHA (IRPHE) & Pierre BOIVIN (M2P2)

The scientific consensus on the necessity to reduce the greenhouse gases, like carbon dioxide (CO2),tends to ban the use of carbon-based fossil energy. This leads to intense research on alternative sources of energy. One of the most promising is hydrogen, but it rises questions in terms of safety and control that need to be clarified in order to use it in domestic, transportation and industrial processes (...)fluids The scientific consensus on the necessity to reduce the greenhouse gases, like carbon dioxide (CO2),tends to ban the use of carbon-based fossil energy. This leads to intense research on alternative sources of energy. One of the most promising is hydrogen, but it rises questions in terms of safety and control that need to be clarified in order to use it in domestic, transportation and industrial processes (...)