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There are many ways of describing a solid,porous or fluid region of the computational domain when solving the Navier-Stokes equations(NSE) for flow motions.Amongst these the porous cell method is one of the most flexible approaches.In this method, a parameter is defined as a ratio of the volume open to water and air in a calculation cell to its cell volume.In the calculation,the same numerical procedure is applied to every cell and no explicit boundary conditions are needed at solid boundaries.The method is used to simulate flow through porous media,around solid bodies and over a moving seabed.The results compare well with experimental data and other numerical resuhs.In our future work the porous cell method will be applied to more complex fluid-solid" interaction situations.