Fluid–structure interaction during the impact of a cylindrical shell on a thin layer of water

摘要: Abstract A two-dimensional unsteady analysis of an elastic circular cylindrical shell that enters a thin layer ideal incompressible liquid is considered. The cylinder initially touches the free surface at single point and then penetrates constant vertical velocity. problem coupled because flow, shape geometry contact region between body must be determined simultaneously. flow subdivided into four complementary regions exhibit different properties: beneath entering surface, jet root, spray jet, outer region. complete solution obtained by matching solutions within these subdomains. structural based on normal-mode method. Strain-time histories inner are particular interest. In case very flexible three distinct regimes impact process were found. For high velocity lower part flattens does not enter water. moderate reaches bottom effect “fluid capture” may occur. low liquid, but size decreases before bottom. This behaviour corresponds to exit or “reflection” from water layer.