Position details
Intake with fan flow simulation
Job offer & Post-Doc ›
Computational Fluid Dynamics - Aerodynamics
Required Education / Niveau requis
PhD
From / Date de début
September 2010
Duration / Durée
2 years (1+1)
Context / Contexte
The objectives in term of pollutant emissions set by the ACARE have prompted motorists and aircraft manufacturers to reduce mass et improve fuel efficiency of aeronautics components. One way to achieve such objectives focusses on the design of the intakes of turbojet engines. Besides geometric constraints and the need for high efficiency, a crucial certification issue is the ability to sustain crosswind inflow: norms set a maximum acceptable level of distorsion in front of the fan. Indeed, when the intake is in a crosswind flow, a separation occurs on the side of the intake. The resulting inhomogeneity in the fan plane triggers flow instabilities down to the compressor, that can lead to surge of the engine.In this context, numerical simulation is a valuable tool to support the design of innovative intakes. Simulations performed at CERFACS have shown the capability of CFD to accurately reproduce the physics of the flow around intakes in crosswind in the absence of the fan. However, new design concepts studied by motorists, and SNECMA in particular, require to account for the fan in the simulation, due to its strong upstream influence.
The simulation of such flows raises many challenges: cohabitation of incompressible and transsonic areas, hysteris phenomena, and the importance of turbulent and transition modeling.
Description / Description
The work will consist in the numerical simulation and analysis of the flow around an intake and a fan, with and without ground effect.Unsteady RANS simulations on a 360° geometry will be made, relying on the non-matching sliding-mesh technique at the interface between the fan and intake.
The computations will involve meshes with several dozens of million points, performed on massively parallel computer architectures.
The results will be validated against experimental data obtained on an industrial configuration.
The successful candidate is expected to publish his results in international journals. This position will be an excellent opportunity to meet and interact with academic and industrial partners of CERFACS, and with SNECMA in particular. Previous CFD members of CERFACS are found everywhere in industry and academic positions (see http://pantar.cerfacs.fr/4-26339-Ex-members-of-the-CFD-Team.php).
We are looking for candidates with a PhD formation, good knowledge of fluid mechanics and aerodynamics. Knowledge of turbomachinery flows is a plus. Besides, the candidate will have proven experience (publications in international journals) of conducting URANS simulations in a HPC environment.
Salary: 2250 Euros net/month.
Contacts / Contacts
Name: Dufour Guillaume
Phone: (33).(0)5.61.19.30.80
Fax: (33).(0)5.61.19.30.00
Email: gdufour@cerfacs.fr
Name: Boussuge Jean-François
Phone: +33 (0)5 61 19 30 62
Fax: +33 (0)5 61 19 30 00
Email: boussuge@cerfacs.fr
