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首页> 外文期刊>Journal of Mechanical Science and Technology >A parametric study on the influence of boundary conditions on the longitudinal pressure gradient in CFD simulations of an automotive wind tunnel
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A parametric study on the influence of boundary conditions on the longitudinal pressure gradient in CFD simulations of an automotive wind tunnel

机译：跨越式跨越汽车风隧道纵向压力梯度对纵向压力梯度影响的参数研究

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摘要

Computational fluid dynamics (CFD) is an important and extensively used tool for aerodynamic development in the vehicle industry today. Validation of virtual methods by comparison to wind tunnel experiments is a must because manufacturers aim to substitute physical tests on prototype vehicles with virtual simulations. An appropriate validation can be performed only if the wind tunnel geometry with representative boundary conditions is included in the numerical simulation, and if the flow of the empty wind tunnel is accurately predicted. One of the important flow parameters to predict is the longitudinal pressure distribution in the test section, which is dependent on both the wind tunnel geometry and the settings of the boundary layer control systems. This study investigates the effects of flow angularity at the inlet and different boundary layer control systems, namely, basic scoop suction, distributed suction, and moving belts, on the longitudinal pressure distribution in the full-scale aerodynamic wind tunnel of Volvo Cars using CFD and a systematic design of experiments approach. The study shows that the different suction systems used to reduce boundary layer thickness upstream of the vehicle have statistically significant effects on the longitudinal pressure distribution in the test section. However, the estimated drag difference induced on a typical vehicle by the difference in horizontal buoyancy between the tested settings is within the test-to-test uncertainty of the physical wind tunnel, thereby leading to the conclusion that force calculations in simulations are fairly insensitive to the tested parameters on the investigated intervals.
机译：计算流体动力学（CFD）是当今车辆行业的一个重要且广泛使用的工具，用于当今车辆行业的空气动力学发展。通过与风洞实验比较的虚拟方法的验证是必须的，因为制造商的目标是通过虚拟模拟替代对原型车辆的物理测试。只有在数值模拟中包括具有代表边界条件的风隧道几何形状，并且如果准确地预测空风洞的流动，则可以仅执行适当的验证。预测的重要流程参数之一是测试部分中的纵向压力分布，其取决于风隧道几何形状和边界层控制系统的设置。本研究研究了流动角度在入口和不同边界层控制系统的影响，即基本勺抽吸，分布式吸力和移动带，在使用CFD和沃尔沃汽车全规模空气动力隧道中的纵向压力分布上实验方法的系统设计。该研究表明，用于降低车辆上游边界层厚度的不同抽吸系统对试验部分中的纵向压力分布具有统计学意义的影响。然而，通过测试设置之间的水平浮力差异在典型车辆上引起的估计阻力差是物理风洞的测试到测试不确定度，从而导致模拟中的力量计算的结论相当不敏感测试间隔的测试参数。

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