Cenaero
Cenaero
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Turbomachinery

 
Real geometry effects
  • Seal leakage flows
    • Detailed analysis of the flow exchange between the main channel and the cavity underneath the hub surface 
    • Simulations applied to both compressor and turbine stage configurations
  • Casing treatments
    • Design and analysis of annular recesses (without and with penetration of the rotor blade tip into the casing) or circumferential grooves
  • Manufacturing or engine wear effects
    • Simulations including fillet radius or weld beads performed through adequate meshing (either through appropriate blocking for structured meshes or through unstructured meshing)
    • Wall roughness effects

True physics

  • Aerothermal simulations
    • 3-D numerical model for surface air cooled oil cooling (ACOC): fins optimization to determine the best compromise between heat power and aerodynamic losses
    • Complex simulations and optimization of engine cooling systems combining internal convection cooling with external film cooling
  • Multi-phase flows
    • Numerical model for Gerotor pumps based on a deforming mesh approach coupled to a remeshing strategy enabling to cope with the permanently deforming cavities located between the inner and outer gears
    • Scavenge systems simulation
  • Unsteady flows 
    • Sliding mesh or phase-lagged approaches to model nonaxisymmetric casing treatments, aeroelastic effects such as flutter and forced response as well as real geometry or condition effects
    • State-of-the-ar t research activities investigating the feasibility of hybrid RANS-LES approaches for a better modeling of turbulence
Innovative design
  • Multi-physics multi-criteria design tackling over a hundred parameters within a heavily constrained setting
    • Aerodynamic shaping of non axisymmetric end walls for compressors and turbines
    • Aero-mechanical shape optimization of composite fan blades accounting for fluid-structure interaction
    • Aero-acoustic design and optimization of CROR propellers with severe mechanical constraints
  • Tailored design methodologies including shape parameterization, robust mesh generation, integration of real geometry/technological effects, cost functions definition, etc.
  • Associated computational workflow setup for multi-physics data exchanges, coupling, etc.
Manufacturing processes
  • Fusion and friction welding of aero engine components (blades, disk, shaft, casing, etc.) 
  • Influence of welding on distortions, residual stresses and joint properties 
  • Machining of blades, disk and other complex parts 
  • Influence of welding on crack propagation in aero engine components 
  • Heat treatments 
  • Blade repair by laser cladding
Structural design analysis and optimization
  • All types of simulations: linear and non-linear static, dynamic (impact, vibration), multi-physics (thermal-mechanical, thermal-chemical-mechanical)
  • Aeroengine parts: shape optimization of low pressure compressor blades with static, dynamic (margin on resonant frequencies) and aerodynamic constraints 
  • Metallic and composite parts (composite blades, inner and outer shrouds, containers, pylon, nacelles, test benches, etc.)
  • Test structures and test samples / technical demonstrators
  • Expertise in simulation of fastened and adhesively bonded structures (design and modeling, including hybrid joining)
Process design, modeling and simulation for composite parts
  • Thermal and chemical shrinkage of parts with complex 2D and 3D fibre architectures
  • Thermal – mechanical simulation and optimization of molds (heating power, thermal map, etc.)
  • Mold compensation & experimental characterization
  • Prediction of the local fibre architecture / fibre orientation, volume fraction from simulations of manufacturing (draping, braiding, etc.)
  • Global simulation of machining (hole drilling, trimming, …) of composite parts, prediction of the final shape, characterization of local delamination and experimental validation
Structural integrity and damage tolerance analysis
  • Assessment of the containment system submitted to high speed impact from debris of low pressure compressor disc after failure under LCF conditions 
  • Assessment of the containment system submitted to high speed impact from blades (blade out simulation) after failure
  • Analysis of the stability of manufacturing defects or detected cracks (porosity modeled as cracks, fitness-for-service)
  • Fatigue crack propagation in metallic structures, prediction of the service life of metallic aero-engines components and equipments (multiple cracks in spacecraft engine blades with complex thermal stresses and pressure maps, crack propagation under combined HCF and LCF loading for low pressure compressor blade, crack propagation under forced response in blades and disks, crack stability and propagation in fittings and supports, etc.)
  • Non linear 3D analysis of failure of assembled compressor stages with continuum damage mechanics for the bulk material, detailed modeling of  bolts, …
Materials selection, constitutive & damage modeling and optimization
  • Derivation of constitutive models and parameters identification by inverse analysis (ex: short or continuous fibres reinforced materials, multi-phase alloys, …)
  • Derivation and implementation of damage models for bulk materials (Continuum Damage Mechanics) and for adhesive joints (Cohesive Zone)
Large scale structural analysis on HPC infrastructure
  • Up to 50MDOFS FE simulations with material and geometrical non-linearities, macro-elements, bushings, contacts, multi-body assemblies