Numerical Simulation on the Texture of Friction Surface Based on Boltzmann Method
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摘要: 摩擦表面的表面织构具有改善摩擦副表面接触方式和润滑状态的作用。采用格子Boltzmann方法对表面织构进行数值模拟分析，采用D2Q9二维速度模型，非平衡外推边界处理格式，编写了模拟的计算程序，模拟出二维方槽、三角形槽及梯形槽织构表面的流动。针对上述流动，计算出雷诺数不同时的流线图，并分析了不同形状凹槽流动的变化，计算了不同形状、深度条件下阻力系数的变化并概括了影响规律。通过对表面阻力的比较发现：梯形凹槽是最优的表面织构；由方形槽的模拟可知，织构形状的深径比也存在最优值，从而证明了Boltzmann方法是模拟复杂流体运动的有效方法。
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关键词:
- Boltzmann方法 /
- 表面织构 /
- 摩擦 /
- 阻力系数
Abstract: The surface texture of the friction surface plays a role in improving the contacting manner and lubrication state between the friction surfaces. Lattice Boltzmann method is introduced to the theoretical analysis and the numerical simulation of surface texture. A simulation calculation program has been written with D2Q9 two-dimensional velocity model and non-equilibrium extrapolation boundary processing format. The flow on the texture surface is simulated with this program mainly relating to the two-dimensional square groove, the triangle groove and the trapezoidal groove. Corresponding to the above-mentioned flow, the flow diagrams are calculated based on the different Reynolds numbers. At the same time, the changes of the flow for the different grooves are analyzed. The drag coefficients involving in different shapes and depths were calculated while the influencing factors are summarized. Through the comparison of the surface resistance, the results show that the trapezoidal groove is best surface texture. There exists an optimal value of the depth to diameter ratio seen from the simulation of the square groove. Thus, Boltzmann method is an effective method to simulate complex fluid motion.-
Key words:
- Boltzmann method /
- calculations /
- computer simulation /
- drag coefficient
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