Improving Fan Conception to Get the Expected Performance
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Improving Fan Conception to Get the Expected Performance
Rodrigo BENEVIDES
Senior Simulation Engineer
Valeo Powertrain Thermal Systems – La Verrière (France)
6th European Altair Technology Conference – April 2013
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The Valeo Group
Global Presence
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The Valeo Group
Climate Control
Powertrain Thermal Systems
Climate Control Compressors
Front-End Modules
4 Business Groups
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Introduction
Motivation
Modified shape of fans in rotation can change its efficiency
Objective
Deformed Shape when rotating = Designed Shape to reach Expected Performance
Structural Simulation
Stiffness Anisotropy
Rheology-Structure Coupling approach
Methodology
Mesh treatment for structural simulation
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Fan Performance
CFD Simulation
Design for Expected
Performance
When Rotating Fan should have the Shape of CFD Conception
Deformed Fan when
Rotating
Efficiency
Reduction = - 5%
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Reinforced Plastics Stiffness
injection g
ate
plate
Tensile test samples:
45°
90°
0°
Stiffness depends on the orientation of fibers
Specimen tested at 23°C, RH50
0
20
40
60
80
100
120
140
0 0,02 0,04 0,06 0,08 0,1 0,12
Engineering strain
En
gin
ne
rin
g s
tre
ss
(M
Pa
)
0
45
90
Tensile Tests
90° 45° 0°
Strain
Str
es
s
(Thickness
direction)
Fibers
E In-Flow > E Cross-Flow > E Thickness
E = Young modulus
Anisotropy:
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Application
Orientation
of Fibers
Injection Molding
Simulation
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Material Model Effect
Displacement of Fan Under Rotation
Isotropic Material Model
Anisotropic Material Model
Isotropic models can not be used
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Update Geometry
yes
Deformed Shape =
Expected Shape ?
Deformed from
Starting Geometry
Treated Mesh
Deformed from
Treated Mesh
Second
Treated Mesh
Deformed from
Second Treated Mesh
Displacement
scale = x5 Rheology (injection)
Structural (rotation)
coupling
Starting Geometry
Mesh Shape
Treatment: (Before – After) Deformation
no
Methodology
Mesh Treatment is the key
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Mesh Shape Treatement
HyperView
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« Before » model results file
« After » model results file
Mesh Shape Treatement
HyperView
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Next Steps
Add the air pressure load on the structure for each treated mesh
To test different levels of mesh density
FEA Mesh CFD Mesh
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Special thanks to:
Manuel HENNER (CFD Expert and CFD Department Manager)
Bruno DEMORY (CFD Expert)
Do you have questions?