Lately, ocean nuclear power plants have attracted attention as one of diverse uses of nuclear power plants. Because ocean nuclear power plants are movable or transportable, it is necessary to analyze the thermal hydraulics in a moving frame of reference, and computer codes have been developed to predict thermal hydraulics in large moving systems. The purpose of this study is to incorporate a three dimensional dynamic motion model into the SPACE code (Safety and Performance Analysis CodE) so that the code is able to analyze thermal hydraulics in an ocean nuclear power plant. A rotation system that describes three-dimensional rotations about an arbitrary axis was implemented, and modifications were made to the one-dimensional momentum equations to reflect the rectilinear and rotational acceleration effects. To demonstrate the code's ability to solve a problem utilizing a rotational frame of reference, code calculations were conducted on various conceptual problems in the two-dimensional and three-dimensional pipeline loops. In particular, the code results for the three-dimensional pipeline loop with a tilted rotation axis agreed well with the multi-dimensional CFD results.

近年来，海洋核电站作为核电站的多种用途之一引起了人们的关注。由于海洋核电站是可移动或可运输的，因此有必要在移动参考系中分析热工水力，并且已经开发了计算机代码来预测大型移动系统中的热工水力。本研究的目的是将三维动态运动模型纳入 SPACE 代码（安全和性能分析代码）中，以便该代码能够分析海洋核电站的热工水力学。实现了描述围绕任意轴的三维旋转的旋转系统，并对一维动量方程进行了修改以反映直线和旋转加速度效应。演示代码' 由于利用旋转参考系解决问题的能力，对二维和三维管道循环中的各种概念问题进行了代码计算。特别是，具有倾斜旋转轴的三维管道循环的代码结果与多维CFD结果一致。