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首页> 外文期刊>Applied Mathematical Modelling >Analysis of three-dimensional flow in a cylindrical sediment oxygen demand chamber
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Analysis of three-dimensional flow in a cylindrical sediment oxygen demand chamber

机译：圆柱状沉积物需氧腔中的三维流动分析

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摘要

The rate of consumption of dissolved oxygen at the bottom of a river or coastal water is often measured in situ by a sediment oxygen demand (SOD) chamber. A continuous flow is generated above the sediment, and the SOD is determined from the difference in oxygen concentrations in the inflow and outflow. The steady three-dimensional swirling laminar flow field inside a cylindrical SOD chamber previously use din field investigations is computed using the finite volume method on an unstructured tetrahedral mesh. The numerical predictions reveal a highly complicated flow characterized by (i) a mainly tangential and near-uniform flow along the circumference in the horizontal layers; (ii) significant reverse bottom current; and (iii) strong swirl induced by the jet momentum in the vertical section. The computed scalar field suggests that good mixing is achieved within the chamber. The computed velocity and scalar field are well supported by laboratory velocity measurements using laser-Doppler anemometer (LDA), and measured concentrations in a tracer experiment. The present study elucidates the fluid mechanics of an important type of SOD chamber design often used in environmental water quality studies.
机译：通常通过沉积物需氧量（SOD）室就地测量河流或沿海水域底部溶解氧的消耗速率。沉积物上方会产生连续流，而SOD是根据流入和流出的氧气浓度差异确定的。使用有限体积法在非结构化四面体网格上计算了以前使用din场研究的圆柱形SOD腔室内的稳定三维旋流层流场。数值预测揭示了一个高度复杂的流动，其特征是：（i）沿水平层圆周的切向和接近均匀的流动； （ii）明显的反向谷底电流； （iii）垂直截面的射流动量引起的强烈涡旋。计算出的标量场表明在腔室内实现了良好的混合。使用激光多普勒风速计（LDA）进行实验室速度测量以及在示踪剂实验中测量浓度，可以很好地支持计算的速度和标量场。本研究阐明了经常用于环境水质研究中的一种重要类型的SOD腔室设计的流体力学。

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