Numerical Simulation For Fluid-Mechanical Interaction And Analysis For Dynamic Of Sandy Seabed With Wave

The analysis for dynamic stability of seabed or offshore foundation under wave loading is of practical significance in the design and construction of offshore and coastal structures. At present mostly the sea bed power response under the wave is carried on the numerical calculus and the analysis through the limited unit, this method usually merge the unitary matrix to a great total stiffness matrix, but the finite difference principle may in each step produce the finite difference equation effectively, The explicit method is most suitable regarding big morbid , physical instability and so on.. Like this in simulates under the big storm function the sea bed big displacement, the big strain, the finite difference method is more effective.So it has importance in theory and applied value of engineering to research the Fluid-Mechanical Interaction and analysis for dynamic of sandy seabed and elastoplasticity analysis under wave loading are developed, proposed the judgment basis for the sea bed foundation stability problem.This paper uses fast Lagrangian analysis method. First, carry on the confirmation to the computational method: Build the breakwater and the sea bed numerical model according to the test parameter and the size, then carry on the computation of the interaction between the wave and the sea bed to obtains the thick nature mold bed mesopore hydraulic pressure, and compares with the value of physical testing. We find that the pore-water pressure predicted value and the actual value curve is fitting well under the linear regular wave action, showing establishes the mathematical model is correct, feasible.Considered that the mutual influence function between stress field and infiltrates the flow field, carry on the Fluid-Mechanical Interaction and analysis for dynamic of three-dimensional to the sandy sea bed ground's stability. The computation uses the three dimensional elastoplasticity finite difference method, and selects Mohr- the Coulomb yield criterion. The transfusion analysis selects the Darcy. Analysis for dynamic selects three dimensional plane strain entire mechanical analysis. Uses the complete misalignment method. Analyses for dynamic simulate bias field, stress field as well as plastic area of shore protection - sea bed system under linear regular wave.