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基于表面力模型的液滴冲击弹性基底SPH模拟
SPH simulation of liquid drops impact on elastic substrates based on a surface force model
投稿时间:2019-06-17  修订日期:2019-10-12
DOI:
中文关键词:  SPH数值算法,自由表面液滴,流固耦合,弹性基底
英文关键词:SPH numerical algorithm, free surface droplet, fluid-solid interaction, elastic substrates
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目) 山东省自然科学基金青年基金
作者单位E-mail
董祥伟 中国石油大学(华东) 20170082@upc.edu.cn 
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中文摘要:
      采用光滑粒子动力学(SPH)方法建立液滴冲击弹性基底的流固耦合数值模型,给出描述粘性流体和弹性固体运动的SPH离散方程和数值处理格式,引入人工耗散项来抑制标准SPH方法中的数值震荡。为模拟液滴的表面张力效应,通过精确检测边界粒子,采用拉格朗日插值方法计算表面法向量和曲率,结合界面理论中的连续表面力(CSF)方法,建立了适用于自由表面液滴的表面力模型,方形液滴变形的模拟结果与拉普拉斯理论解吻合较好。随后,采用SPH流固耦合模型模拟1.0mm直径水滴以不同速度(0.2~3.0m/s)冲击两种薄板型基底,分析了基底弹性变形对液滴铺展、收缩以及回弹行为的影响。
英文摘要:
      A fluid-solid interaction model for the simulation of liquid drops impinging on elastic substrates was established by using the smoothed particle hydrodynamics (SPH) method. The SPH discrete equations for describing the motion of viscous fluids and elastic solids were introduced, and corresponding numerical schemes were given. The artificial diffusion terms were introduced to deal with the numerical oscillation in the standard SPH. To simulate the surface tension effect on liquid drops, by accurately detecting the boundary particles, the parameters including surface normal and curvature were calculated through the Lagrange interpolation. Combined with the continuous surface force (CSF) method in the interface theory, the surface force model for free surface droplets were proposed. The simulation result of square droplet deformation was consistent with the Laplace equation. Subsequently, the model was used to simulate the impact of 1.0mm-diameter water drops on two types of thin-plate substrates. The effect of substrate deformation on droplet behaviors, including spreading, recoiling, and bouncing, were analyzed.
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