| At present,with the development of fluid simulation technology,the requirements for real-time fluid simulation are getting higher and higher;for example,the hydraulic fracturing method for coalbed methane mining needs to study the interaction between water body and pipeline.Therefore,the high efficiency and high real-time simulation of water flow is of great significance for the study of hydraulic fracturing schemes.The smooth particle hydrodynamics(SPH)method in the Lagrangian method is still a common method for simulating water flow phenomena.The basic idea is to treat the water flow as consisting of a series of particles.The entire simulation process includes fluid particle initialization,force analysis of fluid particles,interaction of fluid particles with solid walls,and updating particle velocity and position.The force of the particles is affected by the particles in their adjacent particles(smooth core radius).The adjacent particle search takes up most of the time of fluid simulation;furthermore,in the interaction between fluid and solid wall,the particle processing at the solid boundary is good.Bad directly affects the authenticity of the fluid simulation.Aiming at the influence of neighborhood search algorithm on water flow simulation efficiency in water flow simulation,based on the original proximity particle search algorithm,in order to improve the proximity particle search speed,multi-dimensional tree search combining the parallel operation capability of GPU and the advantages of multi-dimensional tree search algorithm will be used.The algorithm is applied in the simulation of water flow,so that the whole algorithm is carried out on the GPU.It is proved by experiments that the algorithm can greatly improve the search efficiency of adjacent particles in the search time and search efficiency of adjacent particles.The search time is compared based on CPU.Themulti-dimensional tree search algorithm performs 5-6 times faster,achieving high efficiency of water flow simulation.Especially when the number of particles is large,the effect is more obvious.Aiming at the low real-time simulation of water flow simulation,an improved solid-wall boundary processing algorithm is proposed by using the original mirror particle boundary processing algorithm in the particle-solid collision part of SPH water flow simulation process.It can effectively prevent particles from penetrating the solid wall boundary.Compared with the non-use boundary treatment and the traditional boundary processing method,the simulation of this algorithm is more real-time and the effect of water flow simulation is better.Thirdly,the commonly used solid wall boundary processing algorithm is introduced in detail.Based on this,an improved solid-liquid boundary processing algorithm is proposed.The principle and implementation flow of the algorithm are given.The experimental and other solid wall boundary processing algorithms are compared to verify the authenticity of the algorithm.Through the above two system improvement schemes,after the water flow simulation environment and the platform,by setting the initial density of the fluid,the number of solid boundary particles,the number of fluid particles and the like,the water flow into the container can be performed in a certain time step.The high-efficiency realistic simulation,the simulation effect can achieve real-time and high efficiency under the same conditions.It provides a good foundation for hydraulic fracturing gas mining technology. |
