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Accueil > A propos du LPP > Communication > Actualités archivées > 2014 > LPP participates in two projects recently selected by ANR (French National Research Agency), SINAPS and MARMITE

LPP participates in two projects recently selected by ANR (French National Research Agency), SINAPS and MARMITE

 
 
 
 
 

 SINAPS (SImulation Numérique d’écoulements en présence d’Actionneurs PlasmaS - numerical simulation of airflows in presence of plasma actuators)

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Scheme, CEDRE simulation and strioscopy of a sparkjet.
Credit : ONERA, D. Caruana, AIAA-2010-5103.

In the framework of the ANR project ASTRID, the SINAPS project aims to perform numerical simulations of the interaction of flow with plasma actuator. Three groups of plasma actuators have been identified. The first one aims to deposit energy in a supersonic flow in general by microwave or pulsed laser. The second one uses the principle of DBD (Dielectric Barrier Discharge) and it works with flow of several tens of meters per second. The third one concerns synthetic jets, that induce plasma jets up to 300m/s . The scientific challenge of SINAPS is improving the understanding of the interaction between the act uators and the flow. We intend to perform numerical simulations of flows in the presence of plasmas generated by these three groups of actuators.
Computational tools (model code modules, ...) to achieve reliable numerical experiments will also be developed during this project, they should improve the design of new actuators in aerodynamic configurations of interest and contribute significantly to optimizing the aerodynamic performance of aircraft.
Some partners of the project are involved in the NATO AVT 190 group. lt aims to establish a reliable database of experimental and numerical work for plasma actuators on cases standardized tests carried out jointly by different laboratories in US and Europe. The proposed works in SINAPS will benefit from international exchanges necessary to the validation of complex numerical calculations either by experiment or by comparison with other models.
These applications in SINAPS are dual : they concern the improvement of performance of military and civilian aircraft such as drag reduction of pressure or friction and improved maneuverability. They also cover issues of the aviation industry of the future environmental challenges of the next twenty years.
SINAPS is under the main responsibility of ONERA in Toulouse

Jean Larour, from LPP “Hot Transient Plasmas “ team, has management task and liaises with a NATO workgroup on plasma-based flight control.

 MARMITE (MAgnetic inteRactions at Mercury between the InTerior and the Exosphere)

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[Left panel] Mercury simulated magnetosphere for the particular conditions of THEMIS Solar telescope observations of the Na emission from Mercury’s exosphere shown on the right panel. The lines represent the magnetic field lines of Mercury’s magnetosphere and the color the intensity of the solar wind flux reaching the surface (red color corresponding to the peak of intensity). [Right panel] Observed emission brightness in k-Rayleigh (vertical scale on the right) measured by THEMIS solar telescope in July 2008 (Leblanc et al. 2008). In these panels, the geographic North pole is at the top of each panel and the Sun on the left. From Mangano et al. (2012).

[Extract from the ANR summary of the project] MARMITE stands for MAgnetic inteRactions at Mercury between the InTerior and the Exosphere. A MARMITE is a large cooking pot where different and sometimes unexpected but simple ingredients are mixed and stewed. This research program proposes a scientific recipe, which will provide a new flavor for understanding Mercury’s structure and dynamics through the merging of tools which are traditionally dedicated to independent studies of the convecting core, the (thin) mantle, the surface, the exosphere, the ionosphere and the magnetosphere.
Understanding the similarities and differences among bodies within the solar system is a very powerful tool for unraveling their origin and evolution, and by comparison, for improving our knowledge about our unique Earth planet. Here we propose to describe, model and understand the magnetic environment of Mercury and its sources, internal (i.e., from the core to the lithosphere), or external (i.e., resulting from the interaction of the planet with the solar wind). These environments indeed bring crucial and otherwise inaccessible constraints to the internal structure and dynamics of the body and of its envelopes.
Mercury is the smallest, innermost and possibly most enigmatic of the telluric planets. Prior to space age, its small radius and slow rotation suggested a frozen interior bearing no internal dynamics.
The Mariner 10 mission shook this paradigm and showed that Mercury is the only other known telluric planet besides the Earth with an active dynamo. Mercury indeed possesses a weak internal magnetic field governed by largely unknown processes. Its exosphere is populated by numerous species, with great spatial and temporal variabilities. The interactions of the internal field, the exosphere and the solar wind lead to a very dynamical magnetosphere, which in turn induces electromagnetic currents in the interior and exosphere.
MARMITE proposes to analyze the magnetic field measurements performed by the currently orbiting-around-Mercury MESSENGER spacecraft. The project aims at characterizing the internal static magnetic field and estimating its possible secular variation. It will resort to new modeling schemes to take into account the very elliptical orbit of MESSENGER and the fact that only a portion of the northern hemisphere is flown close enough to the surface. Once this internal field is described, it will be interpreted in terms of internal dynamics and structure. Numerical simulations of the dynamo will be performed to both explain the observed morphology of the field where it is known, and predict what may be its morphology above the southern hemisphere. The exospheric model will be coupled with a hybrid magnetospheric model. This exospheric-magnetospheric hybrid model will be coupled to the surface and interior electrical conductivity. Finally it is intended to gather all these elements into a single model which would take into account all magnetic sources and interactions, taking advantage of the original collaboration between fields of research that are usually often disconnected.
This research proposal largely deals with the analysis of the NASA mission MESSENGER, in orbit around Mercury since 2011 to validate the new models. In the framework of MARMITE it is also intended to develop theoretical and analytical tools to model the magnetic environment of a weakly magnetized body such as Mercury. This will especially contribute to a better preparation of the team for the next ESA-JAXA Cornerstone mission BepiColombo, to be launched in 2016. It could also be considered applying such tools on other planets and moons like Ganymede, the Earth’s Moon, and Mars, to provide case studies for a better understanding of our planet.

LPP implication : G. Chanteur : Coordinator of LPP partnership ; Magnetosphere modeling ; induction modeling in the hybrid model. He is Co-Pi of the Plasma Wave Instrument (PWI) on MMO spacecraft of BepiColombo ESA-JAXA mission, and responsible of DBSC (Dual Band Search Coil) which is part of PWI. D. Delcourt : Plasma circulation and exosphere coupling. He is responsible of MSA (Mass Spectrum Analyser) on MMO.

See LPP participation in BepiColombo space mission.


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Tutelles : CNRS Ecole Polytechnique Sorbonne Université Université Paris Sud Observatoire de Paris Convention : CEA
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Exploitant du site : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Hébergeur : Laboratoire de Physique des Plasmas, Ecole Polytechnique route de Saclay F-91128 PALAISEAU CEDEX
Directeur de la publication : Pascal Chabert (Directeur)