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Scale-Resolving Simulation of an ‘On-Road’ Overtaking Maneuver Involving Model Vehicles

機(jī)譯：涉及模型車輛的“陸路”超車機(jī)動(dòng)的規(guī)模解決模擬

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Aerodynamic properties of a BMW car model taking over a truck model are studied computationally by applying the scale-resolving PANS (Partially-averaged Navier-Stokes) approach. Both vehicles represent down-scaled (1:2.5), geometrically-similar models of realistic vehicle configurations for which on-road measurements have been performed by Schrefl (2008). The operating conditions of the modelled ‘on-road’ overtaking maneuver are determined by applying the dynamic similarity concept in terms of Reynolds number consistency. The simulated vehicle configuration constitutes of a non-moving truck model and a car model moving against the air flow, the velocity of which corresponds to the car velocity. The presently modelled ‘on-road’ overtaking maneuver is designed by reference to the complementary ‘quasi stationary’ event investigated experimentally in full-scale wind tunnel of the BMW Group in Munich/Ascheim by fixing the truck model at eight discrete positions relative to the car model, Schreffl (2008); accordingly, the results obtained are discussed also by reference to these measurements, in addition to the results of the realistic ‘on-road’ investigations. The turbulence modelling focus of the present work is on the validation of the PANS approach representing a variable-resolution hybrid LES/RANS modelling framework providing a smooth and seamless transition from Unsteady RANS (Reynolds-averaged Navier-Stokes) to LES (Large-eddy Simulation) in terms of a dynamic ‘resolution parameter’ variation, Basara et al. (2011). As a result of simulations detailed time-dependent mean flow and turbulence fields are obtained, thus enabling the study of the truck/car interference. The surface pressure distribution as well as the resulting drag, lift and side force and corresponding moment variations are discussed along with the available experimental database.
機(jī)譯：通過(guò)應(yīng)用規(guī)模分辨的平板（部分平均的Navier-Stokes）方法，通過(guò)應(yīng)用尺度分辨率來(lái)研究拍攝卡車模型的BMW汽車模型的空氣動(dòng)力學(xué)特性。這兩個(gè)車輛代表縮?。?：2.5），幾何 - 類似的型號(hào)的現(xiàn)實(shí)車輛配置模型，用于通過(guò)Schrefl（2008）執(zhí)行的路線測(cè)量。通過(guò)在雷諾數(shù)一致性方面應(yīng)用動(dòng)態(tài)相似度概念來(lái)確定建模的“路上”超車機(jī)動(dòng)的操作條件。模擬車輛配置構(gòu)成不移動(dòng)的卡車模型和汽車模型，其移動(dòng)抵靠空氣流動(dòng)，其速度對(duì)應(yīng)于轎廂速度。目前建模的“路上”超車機(jī)動(dòng)旨在通過(guò)參考互補(bǔ)的“準(zhǔn)靜止”事件通過(guò)在慕尼黑/阿什海姆的BMW集團(tuán)的全尺寸風(fēng)隧道中調(diào)查，通過(guò)在八個(gè)離散位置固定卡車模型相對(duì)于汽車模型，施德夫（2008）;因此，除了逼真的“陸路”調(diào)查的結(jié)果之外，還通過(guò)參考這些測(cè)量來(lái)討論得到的結(jié)果。本工作的湍流建模焦點(diǎn)是驗(yàn)證代表可變分辨率的混合LES / RAN建?？蚣艿尿?yàn)證，從不穩(wěn)定的RAN（reynolds-perveraged navier-stokes）到LES（大渦流在動(dòng)態(tài)的“分辨率參數(shù)”變型方面，模擬）Basara等。 （2011）。由于模擬的結(jié)果，獲得了詳細(xì)的時(shí)間依賴性平均流和湍流場(chǎng)，從而能夠研究卡車/汽車干擾。與可用的實(shí)驗(yàn)數(shù)據(jù)庫(kù)一起討論了表面壓力分布以及所得到的阻力，提升和側(cè)力和相應(yīng)的力矩變化。

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