Large Eddy Simulation of Vehicle Aerodynamics Using Parallel Computational Fluids Dynamics

2019 ◽  
pp. 199-205
Author(s):  
Abd-Munim Abd-Halim ◽  
Muhamad Husaini Abu Bakar
Keyword(s):  
Large Eddy Simulation ◽  
Eddy Simulation ◽  
Computational Fluids Dynamics ◽  
Large Eddy ◽  
Computational Fluids ◽  
Vehicle Aerodynamics

Current Status on High Performance Computing for Vehicle Aerodynamics Using Large Eddy Simulation

2007 ◽  
Author(s):  
Makoto Tsubokura ◽  
Takuji Nakashima ◽  
Nobuyuki Oshima ◽  
Kozo Kitoh ◽  
Huilai Zhang ◽  
...  
Keyword(s):  
Large Eddy Simulation ◽  
High Performance ◽  
Current Status ◽  
Navier Stokes ◽  
Eddy Simulation ◽  
The Earth ◽  
Wind Tunnel Measurement ◽  
Large Eddy ◽  
Vehicle Aerodynamics ◽  
Performance Computing

The world’s largest class unsteady turbulence simulations of flow around vehicles were conducted using Large Eddy Simulation (LES) on the Earth Simulator in Japan. The main objective of our study is to investigate the validity of LES, as an alternative to a conventional wind tunnel measurement or the Reynolds Averaged Navier-Stokes method, for the assessment of vehicle aerodynamics.

Large-Eddy Simulation on the Effect of Ambient Perturbation on Vehicle Aerodynamics

2010 ◽  
Author(s):  
Makoto Tsubokura ◽  
Yuki Ikawa ◽  
Masashi Kitayama ◽  
Takuji Nakashima
Keyword(s):  
Wind Tunnel ◽  
Large Eddy Simulation ◽  
Simulation Method ◽  
Wind Gust ◽  
Aerodynamic Forces ◽  
Eddy Simulation ◽  
Pressure Distributions ◽  
Large Eddy ◽  
Vehicle Aerodynamics ◽  
Volume Method

A large eddy simulation method based on a fully unstructured finite volume method was developed, and the unsteady aerodynamic response of a road vehicle subjected to transient crosswinds was investigated. The method was first validated on the 1/20-scale wind tunnel model at a static aerodynamic condition and showed good agreement in the surface pressure distributions. The method was then applied to two transient crosswind situations: a sinusoidal perturbation representing the typical length scale of atmospheric turbulence, and a stepwise crosswind velocity corresponding to a wind gust. Typical transient responses of the aerodynamic forces and moments such as phase shifting and undershoot or overshoot were observed, and their dependence on the frequency and amplitude of the input perturbation is discussed. As a result, the utility and validity of LES is demonstrated in the context that such transient aerodynamic forces are difficult to measure in the conventional wind tunnel measurements.

Development of Large-Eddy Simulation for Vehicle Aerodynamics

2002 ◽  
Author(s):  
S. Krajnovic ◽  
L. Davidson
Keyword(s):  
Large Eddy Simulation ◽  
Computational Cost ◽  
Turbulence Models ◽  
Quantitative Prediction ◽  
Eddy Simulation ◽  
Aerodynamic Properties ◽  
Lower Reynolds Number ◽  
Large Eddy ◽  
Flow Features ◽  
Vehicle Aerodynamics

The feasibility of use of large-eddy simulation (LES) in external vehicle aerodynamics is investigated. The computational cost needed for LES of the full size car at road conditions is beyond the capability of the computers in the near future (Krajnovic´ (2002)). Since LES cannot be used for quantitative prediction of this flow, i.e. obtaining the aerodynamic forces and moments, an alternative use of this technique is suggested that can enhance the understanding of the flow around a car. It is found that making LES of the flow around simplified car-like shapes at lower Reynolds number can increase our knowledge of the flow around a car. Two simulations are made, one of the flow around a cube and the other of the flow around a simplified bus. The former simulation proved that LES with relatively coarse resolution and simple inlet boundary condition can provide accurate results. The latter simulation resulted in flow in agreement with experimental observations and displayed some flow features that were not observed in experiments or steady simulations of such flows. This simulation gave us possibility to study the transient mechanisms that are responsible for the aerodynamic properties of a car. The knowledge gained from this simulation can be used by the stylist to tune the aerodynamics of the car’s design but also by the CFD specialists to improve the turbulence models.

Sign in / Sign up

Export Citation Format

Share Document