基于光滑粒子流体动力学(Smoothed Particle Hydrodynamics,SPH)耦合有限元法(Finite Element Method,FEM),利用LS-DYNA对脉冲射流辅助支撑工件过程进行数值模拟,研究了脉冲射流冲击力和径向流特性,对比了不同头部结构和冲击角度对射流...基于光滑粒子流体动力学(Smoothed Particle Hydrodynamics,SPH)耦合有限元法(Finite Element Method,FEM),利用LS-DYNA对脉冲射流辅助支撑工件过程进行数值模拟,研究了脉冲射流冲击力和径向流特性,对比了不同头部结构和冲击角度对射流冲击力的影响,分析了射流冲击下工件的损伤。结果表明:射流头部与靶板的接触面积越小,水锤阶段的冲击力也越小;冲击角度减小时,垂直于靶板方向上的冲击力分量大幅度减小,水平方向上的冲击力分量小幅度增大,射流冲击力不能根据正交分解法求解;虽然径向流速度较大,但由于径向流分布稀疏不均,其冲击靶板的力只有射流自身冲击力的1/3,一般情况下不足以损伤工件材料。展开更多
In the paper, a numerical study on symmetrical and asymmetrical laminar jet-forced flows is carried out by using a lattice Boltzmann method （LBM） with a special boundary treatment. The simulation results are in very...In the paper, a numerical study on symmetrical and asymmetrical laminar jet-forced flows is carried out by using a lattice Boltzmann method （LBM） with a special boundary treatment. The simulation results are in very good agreement with the available numerical prediction. It is shown that the LBM is a competitive method for the laminar jet-forced flow in terms of computational efficiency and stability.展开更多
文摘基于光滑粒子流体动力学(Smoothed Particle Hydrodynamics,SPH)耦合有限元法(Finite Element Method,FEM),利用LS-DYNA对脉冲射流辅助支撑工件过程进行数值模拟,研究了脉冲射流冲击力和径向流特性,对比了不同头部结构和冲击角度对射流冲击力的影响,分析了射流冲击下工件的损伤。结果表明:射流头部与靶板的接触面积越小,水锤阶段的冲击力也越小;冲击角度减小时,垂直于靶板方向上的冲击力分量大幅度减小,水平方向上的冲击力分量小幅度增大,射流冲击力不能根据正交分解法求解;虽然径向流速度较大,但由于径向流分布稀疏不均,其冲击靶板的力只有射流自身冲击力的1/3,一般情况下不足以损伤工件材料。
基金supported by the National Natural Science Foundation of China (No. 10771134)the Youth Science Foundation of USTC
文摘In the paper, a numerical study on symmetrical and asymmetrical laminar jet-forced flows is carried out by using a lattice Boltzmann method （LBM） with a special boundary treatment. The simulation results are in very good agreement with the available numerical prediction. It is shown that the LBM is a competitive method for the laminar jet-forced flow in terms of computational efficiency and stability.
