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首页> 外文会议>International Tire Exhibition and Conference Sep 18-20, 2001 Busan >Hydroplaning, Wet Traction, and Wet Braking Simulation using CFD
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Hydroplaning, Wet Traction, and Wet Braking Simulation using CFD

机译：使用CFD进行滑水，湿牵引和湿制动模拟

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Computational Fluid Dynamics (CFD) has been employed to simulate tire hydroplaning, wet traction, and wet braking. In the simulation, three-dimensional, unsteady, viscous, and turbulent flows are modeled using a finite volume method. These simulations are conducted to evaluate only the tire tread geometry effect whereas hydroplaning and wet traction are complex phenomena caused by tread design, compound, and road surface roughness. In a hydroplaning simulation, hydrodynamic force called lift force is obtained on thick water layer. Lift force is generated as tread blocks move in downward motion resulting in a squeezing action of water. A moving boundary condition allows the calculation to initiate a squeeze motion onto the water film. For a wet traction simulation, shear stress generated by a rotational motion of a tire and a viscous effect of water between a tire surface and a road pavement are calculated. At different speeds shear stresses for a tire are computed. Then, the slope of these coefficients is found and used as an indicator of the general wet traction performance and the effect of a tire tread. A wet braking model simulates a locked tire skidding motion on a thin wet pavement. In this simulation, a multi-phase flow mixed with water and air has been developed to simulate the resultant pressure around the tire for a braking motion. The simulation results are compared with experimental data obtained in a proving ground. The correlation between calculations and measurements show very reasonable R-square values. Also, the wet braking simulation results are compared with experimental one and show very good agreement.
机译：计算流体力学（CFD）已用于模拟轮胎滑水，湿牵引和湿制动。在模拟中，使用有限体积方法对三维，不稳定，粘性和湍流进行了建模。进行这些模拟仅评估轮胎胎面的几何形状影响，而滑水和湿牵引则是由胎面设计，胶料和路面粗糙度引起的复杂现象。在滑水模拟中，在厚水层上获得了称为升力的水动力。当胎面花纹块向下运动时会产生升力，从而导致水的挤压作用。移动边界条件允许计算启动向水膜的挤压运动。对于湿式牵引模拟，计算了轮胎旋转运动产生的切应力和轮胎表面与路面之间的水的粘性作用。以不同的速度计算轮胎的剪应力。然后，找到这些系数的斜率，并将其用作一般湿牵引性能和轮胎胎面效果的指标。湿制动模型模拟在薄的湿路面上锁定的轮胎打滑运动。在此模拟中，已开发出一种混合了水和空气的多相流，以模拟轮胎周围的制动操作压力。将模拟结果与在试验场中获得的实验数据进行比较。计算和测量之间的相关性显示出非常合理的R平方值。此外，将湿式制动仿真结果与实验结果进行了比较，并显示出很好的一致性。

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