Numerical quantification of aerodynamic damping on pitching of vehicle-inspired bluff body

The influence of transient flows on vehicle stability was investigated by large eddy simulation. To consider the dynamic response of a vehicle to real-life transient aerodynamics, a dimensionless parameter that quantifies the amount of aerodynamic damping for vehicle subjects to pitching oscillation...

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Veröffentlicht in:Journal of fluids and structures Jg. 30; S. 188 - 204
Hauptverfasser: Cheng, S.Y., Tsubokura, M., Nakashima, T., Okada, Y., Nouzawa, T.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Kidlington Elsevier Ltd 01.04.2012
Elsevier
Schlagworte:
Aerodynamic damping
Aerodynamics
Applied fluid mechanics
Computational methods in fluid dynamics
Damping
Dynamic response
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
LES
Marine
Mathematical models
Oscillation
Physics
Pitching
Pitching moments
Stability
Transient aerodynamics
Turbulence simulation and modeling
Turbulent flows, convection, and heat transfer
Underbodies
Vehicle
Vehicles
Vehicle
Pitching
Aerodynamic damping
Transient aerodynamics
LES
Oscillation
Vehicle stability
Transient response
Computational fluid dynamics
Bluff body
Transient flow
Aerodynamics
Car body
Automobiles
Vehicle dynamics
Vibrations
Large eddy simulation
Dimensional analysis
Modelling
ISSN:0889-9746, 1095-8622
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Beschreibung
Zusammenfassung:The influence of transient flows on vehicle stability was investigated by large eddy simulation. To consider the dynamic response of a vehicle to real-life transient aerodynamics, a dimensionless parameter that quantifies the amount of aerodynamic damping for vehicle subjects to pitching oscillation is proposed. Two vehicle models with different stability characteristics were created to verify the parameter. For idealized notchback models, underbody has the highest contribution to the total aerodynamic damping, which was up to 69%. However, the difference between the aerodynamic damping of models with distinct A- and C-pillar configurations mainly depends on the trunk-deck contribution. Comparison between dynamically obtained phase-averaged pitching moment with quasi-steady values shows totally different aerodynamic behaviors. ► We introduce a coefficient to quantify the aerodynamic damping for road vehicle. ► Underbody has the highest contribution to the total aerodynamic damping. ► Difference in aerodynamic damping of vehicles depends on the trunk-deck contribution.
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ISSN:0889-9746
1095-8622
DOI:10.1016/j.jfluidstructs.2012.01.002