Experimental Investigation of the Ground Transportation Systems (GTS) Project for Heavy Vehicle Drag Reduction

Croll, R.H.; Gutierrez, Walter; Hassan, Basil; Suazo, Jose E.; Riggins, Anthony J.

doi:10.4271/960907

Cited by 45 publications

(43 citation statements)

References 2 publications

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“…We present here an overview of the current experimental approach and several preliminary results provided for the integrated tractor-trailer benchmark geometry termed the Sandia Model [2]. The purpose of the tests are for validation of the computational fluid dynamics (CFD) models, and for further insight into truck flow phenomena.…”

Section: Methodsmentioning

confidence: 99%

Progress in Reducing Aerodynamic Drag for Higher Efficiency of Heavy Duty Trucks (Class 7-8)

McCallen¹,

Couch²,

Hsu³

et al. 1999

SAE Technical Paper Series

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This paper describes research and development for reducing the aerodynamic drag of heavy vehicles by demonstrating new approaches for the numerical simulation and analysis of aerodynamic flow. In addition, greater use of newly developed computational tools holds promise for reducing the number of prototype tests, for cutting manufacturing costs, and for reducing overall time to market.Experimental verification and validation of new computational fluid dynamics methods are also an important part of this approach. Experiments on a model of an integrated tractor-trailer are underway at NASA Ames Research Center and the University of Southern California. Companion computer simulations are being performed by Sandia National Laboratories, Lawrence Livermore National Laboratory, and California Institute of Technology using state-of-the-art techniques, with the intention of implementing more complex methods in the future.

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Section: Methodsmentioning

confidence: 99%

Progress in Reducing Aerodynamic Drag for Higher Efficiency of Heavy Duty Trucks (Class 7-8)

McCallen¹,

Couch²,

Hsu³

et al. 1999

SAE Technical Paper Series

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“…Unlike the GTS model used in previous experimental (Croll et al 1996;Storms et al 2001) and computational (Salari et al 2004) studies, this model includes wheels; a schematic of the geometry is shown in Figure 2. For this study we have used GTS model dimensions corresponding to those of a 1/8-scale wind tunnel model.…”

Section: Simplified Heavy Vehicle (Gts): Geometrymentioning

confidence: 99%

A comparison of dispersion calculations in bluff body wakes using LES and unsteady RANS

Paschkewitz¹

2006

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Accurate modeling of the dispersion behavior of sprays or particles is critical for a variety of problems including combustion, urban pollution or release events, and splash and spray transport around heavy vehicles. Bluff body wakes are particularly challenging since these flows are both highly separated and strongly unsteady. Attempting to model the dispersion of droplets or particles interacting with bluff body wakes is even more difficult since small differences in the flow field encountered by particles can lead to large differences in the dispersion behavior. Particles with finite inertia can exhibit additional complicating effects such as preferential concentration. In this preliminary study, we consider the dispersion of solid particles in the wake of a rectangular plane at a Reynolds number (Re) of 10000 and that of droplets in the wake of a simplified tractortrailer geometry at Re = 2 × 10 6 using both the Large Eddy Simulation (LES) and Unsteady Reynolds-Averaged Navier-Stokes (URANS) turbulence modeling approaches. The calculations were performed using identical meshes for both the LES and URANS models. Particle stresses are not backcoupled to the carrier fluid velocity solution. In the case of the rectangular plane wake, the LES calculation predicts a finer-scale and more persistent wake structure than the URANS one; the resulting particle dispersion is considerably (≈ 40%) underpredicted for low inertia particles. For the case of the simplified tractor-trailer geometry, although the LES is underresolved, similar trends are observed with strong differences in the vertical and horizontal dispersion of the smallest particles. These results suggest that it may be necessary to use LES to accurately capture the dispersion behavior of small, low inertia particles or droplets, but that URANS may be sufficient for problems in which only large particles with substantial inertia are of primary concern.

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“…We present herein an overview of the current experimental approach and results provided for the integrated tractor-trailer benchmark geometry termed the Ground Transportation System (GTS) [2]. Continuum Dynamics, Inc. has also provided boattail plates made to fit the GTS Model (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

Aerodynamic Drag of Heavy Vehicles (Class 7-8): Simulation and Benchmarking

Flowers

Owens

Browand

et al. 2000

SAE Technical Paper Series

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This paper describes research and development for reducing the aerodynamic drag of heavy vehicles by demonstrating new approaches for the numerical simulation and analysis of aerodynamic flow. Experimental validation of new computational fluid dynamics methods are also an important part of this approach. Experiments on a model of an integrated tractor-trailer are underway at NASA Ames Research Center and the University of Southern California (USC). Companion computer simulations are being performed by Sandia National Laboratories (SNL), Lawrence Livermore National Laboratory (LLNL), and California Institute of Technology (Caltech) using state-of-the-art techniques.

show abstract

Experimental Investigation of the Ground Transportation Systems (GTS) Project for Heavy Vehicle Drag Reduction

Cited by 45 publications

References 2 publications

Progress in Reducing Aerodynamic Drag for Higher Efficiency of Heavy Duty Trucks (Class 7-8)

Progress in Reducing Aerodynamic Drag for Higher Efficiency of Heavy Duty Trucks (Class 7-8)

A comparison of dispersion calculations in bluff body wakes using LES and unsteady RANS

Aerodynamic Drag of Heavy Vehicles (Class 7-8): Simulation and Benchmarking

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