Based on the Navier-Stokes equation, a numerical method is presented to simulate sloshing phenomena in a rectangular tank which is oscillated horizontally. A computational code is composed of the finite volume method using curve-linear boundary fitted coordinates, and the solution is solved by SIMPLE algorithm. In the numerical simulations with small water depths, the progressive waves with the beet are observed, and the surface displacement shows nonlinear responses. Numerical results are in good agreement with experiments, so the applicability of this code is shown. It is attempted to make clear understand the flow inside the sloshing tank using computer graphics and computational fluid dynamics. The flows are drawn by the velocity vectors, the streamlines, the color contour of pressure, and the vorticity using OpenGL. The streamlines are drawn by both stream function and the line integral convolution (LIC) method.

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It is profitable to design the improvement of the range of discharge water for fire fighting equipment. For achieving the improvement of the range of discharge water, it is increased fluid friction in guide pipe line to the nozzle, and as a result the pressure loss of the entire extinction device is increased. It is a primary factor of the pressure loss which generates the swirling flow in the pipe by the piping element such as elbow, bend tubes where the conduit is formed, and increases resistance in the conduit. It is possible to set up the flow straightener into the nozzle upstream to remove the swirling flow. In this study, the shape of high efficiency flow straightener for fire extinguishing equipment is decided by experiment of making to visible by the spark tracing method. And it is verified the effect that the performance of the high efficiency flow straightener caused for the range of discharge water.

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