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Numerical Ocean Model Using Boundary Fitted Coordinate System

使用边界拟合坐标系的数值海洋模型

基本信息

批准号：
15560693
负责人：
TODA Yasuyuki
金额：
$ 2.24万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560693/
关键词：
Ocean Model Boundary Fitted Coordinate The Small Structure Body Force Distribution Full 3D computation MEC Model Gravity Current 屈折率整合法重量流小型実験境界適合座標人口構造物マルチブロック並列化 MECモデル体積力分布 Full-3D 影響評価

项目摘要

Numerical ocean model using boundary fitted coordinate system has been investigated to treat the complex geometry around the bay and the ocean bottom. Considering the complex geometry and the parallel computing, the block decomposition was used. I those results, the continuity of flow at block boundary was good and the CPU time could be reduced. The fine grid near the free surface was tested using iteration methods. The results were promising, but the small relaxation parameter was needed. It is not good for practical computation.MEC model, in which the hydrostatic approximation is used in large domain and Full-3D computation is used in small domain, was used to estimate the effect of the small artificial structure in the narrow straight. The body force distribution method is used in Full 3D domain. The body force distribution was estimated from the theory or Full-3D CFD computation around structure in uniform flow The results show that the small current generator or upwelling device give the large effect to the coastal flow. The online Version of MEC model was developed. Many users can use MEC model in web blowser.The gravity current was investigated to find the good model in ocean model.

研究了用边界拟合坐标系处理海湾和海底周围复杂几何形状的数值海洋模型。考虑到复杂的几何结构和并行计算，采用了分块分解方法。结果表明，块边界处的流连续性较好，可以减少CPU时间。采用迭代法对自由曲面附近的精细网格进行了测试。结果是有希望的，但需要较小的松弛参数。它不适合实际计算。采用MEC模型，在大范围内采用静力近似，在小范围内采用全三维计算，对窄直道内小型人工结构的影响进行了估计。在全三维空间中采用了体力分布法。通过理论计算或全三维CFD计算估算了均匀流动时结构周围的体力分布，结果表明，小型电流发生器或上升流装置对海岸流动的影响较大。开发了MEC模型的在线版本。许多用户可以在网页浏览器中使用MEC模型。为了在海洋模型中找到较好的模型，对重力流进行了研究。