Numerical Simulation Method And Application Of Fluid-Structure-Soil Dynamic Coupling System

With the rapid growth of Chinese economy, a lot of important infrastructure projects such as harbors, unclear plants and reserve bases of critical materials on the southeast coast are constructed by government. Due to the typhoon which will happen in every summer monsoon period, the facilities that are set to defend against wave impact are threatened. On the other hand, with the acceleration of urbanization, the urban population is rapid increased and the projects of urban water conveyance are rapid carried out. The safe of operation of urban water conveyance has important significance to social stabilization. In the past, the analysis of fluid-structure-soil system usualy ignored the fluid structure dynamic interaction, and the model was simplified because of the large scale computation data.The numerical modeling method of fluid-structure-soil dynamic coupling system is studied. The regions of fluid and structure are described by Arbitrary Lagrange Euler method and Lagrange method, respectively. The interactions between fluid and structure as well as the dynamic contact between structure and soil are studied using penalty method. The results of the whole and the local are calculated using hybrid model. The element size of soil and the artificial visco-elastic boundary are analyzed. The example of fluid-local breakwater-soil system confirmed that the partition method has better parallel efficiency.Numerical simulation of impact response for fluid-breakwater structure-soil dynamic coupling system is carried out in the application of the unclear plant breakwater on southeast coast. The finite element model of the fluid-rubble mound-protection structure-seawalls-soil system is established according to the design drawing. The model and approaches were validated by comparing with wave theory and experimental data. The influences of the structure response, the section size and the shape of breakwater axis on the wave impact are analyzed. The collision of drafting object is discussed.Numerical simulation of water hammer impact for fluid-tunnel-soil dynamic coupling system is proposed in the application of the Qingcaosha water conveyance tunnel. The finite element model of fluid-tunnel-work well-soil system is established. The hybrid modeling method is used. The system is simulated in the initial condition, operating condition and water hammer condition, respectively. Furthermore, the hybrid model is calculated in the water hammer condition.Numerical simulation of seismic response for fluid-tunnel-soil dynamic coupling system is proposed in the application of the Qingcaosha water conveyance tunnel. The model of fluid-tunnel-soil system is established. The moment, displacement and stress responses of the tunnel are analyzed under the uniform excitation, and the stress of bolt and segment, deformation of diameter, and the opening of lining are also analyzed.