Smoothed particle hydrodynamics (SPH) is a Lagrangian meshless particle method. It is one of the best method for simulating violent free surface flows in fluids and solving large fluid deformations. Dam breaking is a ...Smoothed particle hydrodynamics (SPH) is a Lagrangian meshless particle method. It is one of the best method for simulating violent free surface flows in fluids and solving large fluid deformations. Dam breaking is a typical example of these problems. The basis of SPH was reviewed, including some techniques for governing equation resolution, such as the stepping method and the boundary handling method. Then numerical results of a dam breaking simulation were discussed, and the benefits of concepts like artificial viscosity and position correction were analyzed in detail. When compared with dam breaking simulated by the volume of fluid (VOF) method, the wave profile generated by SPH had good agreement, but the pressure had only reasonable agreement. Improving pressure results is clearly an important next step for research.展开更多
A fully Lagrangian algorithm for numerical simulation of fluid-elastic structure interaction(FSI)problems is developed based on the Smoothed Particle Hydrodynamics(SPH)method.The developed method corresponds to incomp...A fully Lagrangian algorithm for numerical simulation of fluid-elastic structure interaction(FSI)problems is developed based on the Smoothed Particle Hydrodynamics(SPH)method.The developed method corresponds to incompressible fluid flows and elastic structures.Divergence-free(projection based)incompressible SPH(ISPH)is used for the fluid phase,while the equations of motion for structural dynamics are solved using Total Lagrangian SPH(TLSPH)method.The temporal pressure noise can occur at the free surface and fluid-solid interfaces due to errors associated with the truncated kernels.A FSI particle shifting scheme is implemented to produce sufficiently homogeneous particle distributions to enable stable,accurate,converged solutions without noise in the pressure field.The coupled algorithm,with the addition of proposed particle shifting scheme,is able to provide the possibility of simultaneous integration of governing equations for all particles,regardless of their material type.This remedy without need for tuning a new parameter,resolves the unphysical discontinuity beneath the interface of fluid-solid media.The coupled ISPH-TLSPH scheme is used to simulate several benchmark test cases of hydro-elastic problems.The method is validated by comparison of the presented results with experiments and numerical simulations from other researchers.展开更多
基金Supported by the National Natural Science Foundation of China under Grant No. 10572041 and 50779008
文摘Smoothed particle hydrodynamics (SPH) is a Lagrangian meshless particle method. It is one of the best method for simulating violent free surface flows in fluids and solving large fluid deformations. Dam breaking is a typical example of these problems. The basis of SPH was reviewed, including some techniques for governing equation resolution, such as the stepping method and the boundary handling method. Then numerical results of a dam breaking simulation were discussed, and the benefits of concepts like artificial viscosity and position correction were analyzed in detail. When compared with dam breaking simulated by the volume of fluid (VOF) method, the wave profile generated by SPH had good agreement, but the pressure had only reasonable agreement. Improving pressure results is clearly an important next step for research.
文摘A fully Lagrangian algorithm for numerical simulation of fluid-elastic structure interaction(FSI)problems is developed based on the Smoothed Particle Hydrodynamics(SPH)method.The developed method corresponds to incompressible fluid flows and elastic structures.Divergence-free(projection based)incompressible SPH(ISPH)is used for the fluid phase,while the equations of motion for structural dynamics are solved using Total Lagrangian SPH(TLSPH)method.The temporal pressure noise can occur at the free surface and fluid-solid interfaces due to errors associated with the truncated kernels.A FSI particle shifting scheme is implemented to produce sufficiently homogeneous particle distributions to enable stable,accurate,converged solutions without noise in the pressure field.The coupled algorithm,with the addition of proposed particle shifting scheme,is able to provide the possibility of simultaneous integration of governing equations for all particles,regardless of their material type.This remedy without need for tuning a new parameter,resolves the unphysical discontinuity beneath the interface of fluid-solid media.The coupled ISPH-TLSPH scheme is used to simulate several benchmark test cases of hydro-elastic problems.The method is validated by comparison of the presented results with experiments and numerical simulations from other researchers.
