In this paper we study the transient surface cavity which is created by the controlled impact of a disk of radius h0 on a water surface at Froude numbers below 200. The dynamics of the transient free surface is recorded by high speed imaging and compared to boundary integral simulations. An excellent agreement is found between both. The flow surrounding the cavity is measured with high speed pa...

Most aquatic vertebrates use suction to capture food, relying on rapid expansion of the mouth cavity to accelerate water and food into the mouth. In ray-finned fishes, mouth expansion is both fast and forceful, and therefore requires considerable power. However, the cranial muscles of these fishes are relatively small and may not be able to produce enough power for suction expansion. The axial ...

This paper presents a semi-analytical solution of undrained cylindrical cavity expansion/contraction problem using two-surface plasticity model for natural stiff clays from the view point poromechanics. The present reduces classical boundary into group seven first-order ordinary differential equations via an auxiliary independent variable ? under conditions. It strictly follows premise constant...

This paper develops a new semi-analytical approach for undrained cylindrical cavity expansions in unsaturated soils. The soil behavior is described within simple, yet effective, critical state-based elastoplastic framework with suction being treated as hardening parameter. Different from its saturated counterpart, the expansion problem soils involves five basic variables, namely, three stress c...