General information
Organisation
The French Alternative Energies and Atomic Energy Commission (CEA) is a key player in research, development and innovation in four main areas :
• defence and security,
• nuclear energy (fission and fusion),
• technological research for industry,
• fundamental research in the physical sciences and life sciences.
Drawing on its widely acknowledged expertise, and thanks to its 16000 technicians, engineers, researchers and staff, the CEA actively participates in collaborative projects with a large number of academic and industrial partners.
The CEA is established in ten centers spread throughout France
Reference
SL-DAM-24-0630
Direction
DAM
Thesis topic details
Category
Engineering science
Thesis topics
Data assimilation for hypersonic laminar turbulent transition reconstruction
Contract
Thèse
Job description
To design a hypersonic vehicle, it is necessary to accurately predict the heat flows at the wall. These flows are strongly constrained by the nature of the boundary layer (laminar/transitional/turbulent). The mechanisms behind the laminar-turbulent transition are complex and still poorly understood. What's more, transitional phenomena are highly dependent on fluctuations in the free flow around the model in the case of wind tunnel testing, or around the craft in the case of flight. These fluctuations are very difficult to measure precisely, which makes the comparison between calculation and testing very complex. To carry out a detailed analysis of flow physics during testing, we need to turn to the results of high-fidelity calculations. It is therefore crucial to be able to reproduce numerically the upstream disturbances encountered. During the course of the thesis, we will be looking to develop data assimilation methods, based on high-fidelity simulation, to invert, i.e. determine fluctuations in the light of observations. The focus will be on assembly techniques based on Bayesian inference. Emphasis will be placed on integrating a priori knowledge of fluctuations. In addition, we will try to reduce the computational cost and quantify the uncertainties on the solution obtained. In particular, the approach will be applied to a flow around the CCF12 (cone-cylinder-flare) geometry realised in the R2Ch wind tunnel at ONERA.
University / doctoral school
Ecole Doctorale de l’Institut Polytechnique de Paris (IP Paris)
IP. Paris
Thesis topic location
Site
Cesta
Requester
Person to be contacted by the applicant
Minvielle Pierre pierre.minvielle@cea.fr
CEA
DAM CESTA
CEA/CESTA
15, Avenues des Sablières
CS60001
33 116 Le Barp cedex
0557044150
Tutor / Responsible thesis director
Minvielle Pierre pierre.minvielle@cea.fr
CEA
DAM CESTA
CEA/CESTA
15, Avenues des Sablières
CS60001
33 116 Le Barp cedex
0557044150
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