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Coupled behaviors of fluid-flow and swimming-jellyfish are necessary for swimming movements and the dynamics governing these coupled behaviors is difficult and complex. A lot of researches investigated coupled behaviors of fluid-flow and jellyfish-swimming by using two-dimensional axisymmetric numerical simulations. However, in order to simulate swimming jellyfish in an asymmetric current, the three-dimensional simulation is necessary. On the other hand, in the simulation of an unsteady flow caused by a moving wall boundary, the Geometric Conservation Law (GCL) is important. In the computational method which does not strictly satisfy GCL, arbitrary grids moving affects the flow field and the physical conservation law is destroyed. Moving-Grid Finite-Volume Method (MGFVM) is suitable for such a flow because GCL is strictly satisfied. In MGFVM, GCL condition is automatically and strictly satisfied by the discretization performed using a four-dimensional control volume in the space and time unified domain (x, y, z, t). In this paper, we perform the three-dimensional coupled simulation of fluid-flow and jellyfish-swimming with six degrees of freedom of motion by using MGFVM and investigate the influence of a current on swimming jellyfish.

Coupled simulation, Swimming, Jellyfish, Incompressible Flow