Improving Fan Conception to Get the Expected Performance

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  • 1. Improving Fan Conception toGet the Expected PerformanceRodrigo BENEVIDESSenior Simulation EngineerValeo Powertrain Thermal Systems – La Verrière (France)6th European Altair Technology Conference – April 2013
  • 2. IIThe Valeo GroupGlobal Presence
  • 3. IIThe Valeo Group Climate Control Powertrain Thermal Systems Climate Control Compressors Front-End Modules4 Business Groups
  • 4. IIIntroductionMotivation Modified shape of fans in rotation can change its efficiencyObjective Deformed Shape when rotating = Designed Shape to reachExpected PerformanceStructural Simulation Stiffness Anisotropy Rheology-Structure Coupling approachMethodology Mesh treatment for structural simulation
  • 5. IIFan PerformanceCFD SimulationDesign for ExpectedPerformanceWhen Rotating Fan should have the Shape of CFD ConceptionDeformed Fan whenRotatingEfficiencyReduction = - 5%
  • 6. IIReinforced Plastics Stiffnessinjectiongate plateTensile test samples:45°90°0°Stiffness depends on the orientation of fibersSpecimen tested at 23°C, RH500204060801001201400 0,02 0,04 0,06 0,08 0,1 0,12Engineering strainEnginneringstress(MPa)04590Tensile Tests90°45°0°StrainStress(Thicknessdirection)FibersE In-Flow > E Cross-Flow > E ThicknessE = Young modulusAnisotropy:
  • 7. IIApplicationOrientationof FibersInjection MoldingSimulation
  • 8. IIMaterial Model EffectDisplacement of Fan Under RotationIsotropic Material ModelAnisotropic Material ModelIsotropic models can not be used
  • 9. IIUpdate GeometryyesDeformed Shape =Expected Shape ?Deformed fromStarting GeometryTreated MeshDeformed fromTreated MeshSecondTreated MeshDeformed fromSecond Treated MeshDisplacementscale = x5Rheology (injection)Structural (rotation)couplingStarting GeometryMesh ShapeTreatment:(Before – After) DeformationnoMethodologyMesh Treatment is the key
  • 10. IIMesh Shape TreatementHyperView
  • 11. II« Before » model results file« After » model results fileMesh Shape TreatementHyperView
  • 12. IINext StepsAdd the air pressure load on the structure for eachtreated meshTo test different levels of mesh densityFEA Mesh CFD Mesh
  • 13. Special thanks to: Manuel HENNER (CFD Expert and CFD Department Manager) Bruno DEMORY (CFD Expert)Do you have questions?