基于SPH的风沙运动的数值模拟

NUMERICAL SIMULATION OF WIND-BLOWN SAND MOVEMENT BASED ON SPH

运用光滑粒子流体动力学(smoothed particles hydrodynamics,SPH)方法对沙粒和气流的相互耦合运动特性进行了分析,研究提出了风沙流的SPH数值方法并进行了数值模拟.首先提出了风沙流的SPH建模方法和基本理论,建立了风沙流动的SPH数值模拟平台.其次通过建立风沙流的SPH模型并施加边界条件,对自然风作用下沙粒的运动情况进行了数值模拟,详细分析了沙粒运动轨迹及特性,最后通过与相关研究成果对比分析,验证了完善后的SPH方法有效性.通过考虑气流场的可变性,在风沙流SPH计算模型中引入了加载(起风)和卸载(停风)方式,观察并对比分析了沙粒的运动轨迹和特性.为进一步研究风沙流的实时动态非线性行为提供了SPH理论基础和数值分析方法.

The smooth particle hydrodynamics （SPH） method is used to analyze the mutual coupling motion cnaractens- tics between sands and the airflow, and the SPH numerical methods of sand flow is proposed and simulated in this study. Firstly, the SPH modeling method and basic theory about the sand flow is proposed and the SPH simulation platform of the flow of sand is established. Secondly, the SPH model and boundary conditions were used to simulate the movement of sand in the wind movement, the motion curve and characteristics of the sand are studied completely. Finally, by con- trasting with the related research analysis, the effectiveness of the SPH method completed is verified. Allowing for the variability of the flow field, the way of loading （windy） and unloading （blowing-out） are applied in the SPH calculation model of sand flow, the motion curve and characteristics of the sand have been observed and comparatively studied. It will be helpful to further study of the constant dynamic nonlinear behavior of the sand flow by SPH theoretical basis and numerical analysis.