Numerical Comparison of Rolling Road Systems

Hennig, Alexander; Widdecke, Nils; Kuthada, Timo; Wiedemann, Jochen

doi:10.4271/2011-37-0017

Cited by 15 publications

(5 citation statements)

References 14 publications

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“…Compared to the results of Hennig et al (1) the results for the Audi RS5 DTM race car are somewhat surprising since Hennig et al recognize bigger influences on the rear lift rather than on front lift for both the generic F3 and the LMP race car. An explanation for the different behavior of the DTM car can be the ride height ratio between front and rear end ℎ , ℎ , ⁄ = 0.75.…”

Section: Single-belt Vs 5-belt Moving Ground Simulationcontrasting

confidence: 73%

“…It is worth mentioning that 5-belt and single-belt systems are merely two possible methods to apply moving ground simulation in an automotive wind tunnel. Additional practical solutions are a 3-belt or a T-belt system, as investigated by Hennig et al (1) , e. g. they show the results of a numerical approach in which significant differences in aerodynamic coefficients were recognized for both different car types and techniques of a moving ground simulation. However, in the present study, only the single-belt configuration was investigated in detail.…”

Section: Introductionmentioning

confidence: 99%

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Moving Ground Simulation for High Performance Race Cars in an Automotive Wind Tunnel

Collin

Indinger

Müller

2017

IJAE

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For the wind tunnel testing of race car aerodynamics, it is essential to cover the real underbody flow field characteristics, as they affect the aerodynamic balance of race cars and, hence, the transferability of wind tunnel measurements to on-road conditions. In this study, numerical simulations have been performed to determine the influence of moving belt dimensions on the aerodynamic forces for a particular race car. The results are compared with an infinitely large moving ground in open road conditions. Thus, the requirements for the dimensioning of a single belt moving ground simulation in wind tunnels for race car aerodynamics are derived.

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Section: Single-belt Vs 5-belt Moving Ground Simulationcontrasting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Moving Ground Simulation for High Performance Race Cars in an Automotive Wind Tunnel

Collin

Indinger

Müller

2017

IJAE

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show abstract

“…Flow interference and contamination of downstream components however, can be a significant source of uncertainty. 17,18 Page et al 9 has reported changes in pressure coefficient of up to ΔCp = −0.1 on the model roof directly ahead and behind of a top strut, reflective of the localised junction flow forcing an upstream and downstream roof separation. Additional changes have been noted by Strachan et al 14 on an Ahmed body (25° backlight angle) with a significant velocity deficit (u* ≈ 0.95) extending up to one model length downstream of the model base, with Strachan et al 11 also showing the wake of the top strut to increase the surface pressure in the backlight region, resulting in the generation of weaker (C-pillar) corner vortices and premature bursting of the separation bubble.…”

Section: Introductionmentioning

confidence: 99%

Upstream wind tunnel model mounting: The forgotten method for road vehicle aerodynamics

Rejniak

Gatto

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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A new method for supporting ground vehicle wind tunnel models is proposed. The technique employs a centrally mounted sting connecting the front face of the vehicle, adjacent to the floor, to a fixed point further upstream. Experiments were conducted on a 1/24th-scale model, representative of a Heavy Goods Vehicle, at a width-based Reynolds number of 2.3 × 105, with detailed comparisons made to more established support methodologies. Changes to mean drag coefficients, base pressures and wake velocities are all evaluated and assessed from both time-independent and time-dependent perspectives, with a particular focus within the wake region. Results show subtle changes in drag coefficient, together with discrete modifications to the flow-field, dependent on the method adopted. Subtle differences in base pressures and wake formation are also identified, with mounting the model upstream found to demonstrate retention of many of the beneficial effects of other techniques without suffering their deficiencies. Overall, these results identify the upstream mounting methodology as a viable alternative to currently available and more well-established techniques used to facilitate wind tunnel aerodynamic interrogation.

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“…Recently due to improved accuracy of CFD, it has become a viable tool for the HST aerodynamic development. [14][15][16][17][18][19][20][21][22][23] CFD is significantly cheaper and easier than an experimental study 26 and it can simulate the different ground conditions without limits existed in the practical wind tunnel testing, for instance, the moving ground can be simulated easily. Therefore, it offers the possibility to simulate the novel concepts.…”

Section: Introductionmentioning

confidence: 99%

Comparison of different ground simulation systems on the flow around a high-speed train

Xia

Shan

Yang

2016

Proceedings of the Institution of Mechanical Engineers, Part F:

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The influence of different ground simulation systems on the air flow around a high-speed train with zero yaw angle is investigated. Force values, force development graphs, surface pressures, the underbody flow and the wake are studied in detail with Computational Fluid Dynamics, which is initially validated by wind tunnel testing. It shows that the stationary ground has severe deviations from the full moving ground on the aerodynamic performance due to the inaccurate pressure distribution on the underbody. This is mainly attributed to the high level of interaction between the underbody and the boundary layer development. In addition, a ground boundary layer separation bubble can be observed under the tail end of the train for the stationary ground on account of insufficient energy to overcome the increasing adverse pressure gradient. In order to guarantee a correct underbody flow, a partially moving ground is proposed, including the ''3-moving ground'' and the ''1-moving ground''. Such ground simulation systems are well compatible with the fixed rail tracks and the bottom support struts compared to the full moving ground. As a conceivable method to reduce the influence of the boundary layer, raising the high-speed train model with different ground clearances is also studied. Overall, the 3-moving ground is suggested to be the best choice for the ground simulation systems in high speed train wind tunnel testing.

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Numerical Comparison of Rolling Road Systems

Cited by 15 publications

References 14 publications

Moving Ground Simulation for High Performance Race Cars in an Automotive Wind Tunnel

Moving Ground Simulation for High Performance Race Cars in an Automotive Wind Tunnel

Upstream wind tunnel model mounting: The forgotten method for road vehicle aerodynamics

Comparison of different ground simulation systems on the flow around a high-speed train

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