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首页> 外文会议>International Conference on Applied Computational Fluid Dynamics October 17-20, 2000 Beijing China >Effects of float shape and simulation coordinates for the numerical study of oil net-boom structures
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Effects of float shape and simulation coordinates for the numerical study of oil net-boom structures

机译：浮子形状和模拟坐标对油网臂结构数值研究的影响

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摘要

This paper emphasizes the numerical study of the effects of float shape and simulation coordinates for some net-boom structures. Firstly, the modeling methodology in a body-fitted coordinate (BFC) system is presented, the grid generation for the particular geometry is briefly described and the porous medium resistance formula for the inclined net is derived. Secondly, the flow patterns and oil losses in three net-boom structures with a circular float are numerically studied. Thirdly, the results for net-boom structures with a circular float are compared to the results for the rectangular float with the same section area. Fourthly, a numerical study for some net-boom structures with a "stepped round" float using a Cartesian grid is conducted and compared with the previous two studies. It is found that the circular float smoothens the flow pattern to bring more water into the net-boom region under the same entry water velocity and may easily cut off the oil into small pieces. This causes a significant decrease of the oil volume of fraction in the oil lump. Therefore, the critical velocity for the circular float case is reduced. It is also found that the effect of float shape is more important, and the particular grid system used for the simulation has little effect.
机译：本文着重于浮力形状和模拟坐标对某些网状动臂结构影响的数值研究。首先，介绍了人体坐标系（BFC）中的建模方法，简要描述了特定几何形状的网格生成，并推导了斜网的多孔介质阻力公式。其次，对三种具有圆形浮子的网状动臂结构的流场和油耗进行了数值研究。第三，将具有圆形浮子的净动臂结构的结果与具有相同截面积的矩形浮子的结果进行比较。第四，使用笛卡尔网格对某些具有“阶梯式圆形”浮子的净臂结构进行了数值研究，并将其与前两项研究进行了比较。发现在相同的进水速度下，圆形浮子使流型变得平滑，从而将更多的水带入净臂区域，并且很容易将油切成小块。这导致油块中的馏分的油量显着降低。因此，减小了圆形浮子壳体的临界速度。还发现浮标形状的影响更为重要，并且用于仿真的特定网格系统的影响很小。

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