Modeling Natural Hydrodynamic Systems with a Differential-Turbulence Column
Modeling Natural Hydrodynamic Systems with a Differential-Turbulence Column
复制标题
使用微分湍流柱模拟自然水动力系统
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
L. W. Lion
中科院分区：
文献类型：
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作者：
Brett K. Brunk;Monroe Weber;A. Jensen;G. Jirka;L. W. Lion
设计了一个微分湍流柱（DTC）来模拟水环境中与污染物归宿相关的水动力学和化学过程。该反应器使用五个垂直间隔的振荡网格来模拟自然流体动力学系统中的湍流。流体动力学和化学反应的测量可以从辅助仪器中获得。的均匀湍流动能（TKE）领域的DTC时，所有的网格相同的操作进行了比较，建立网格搅拌系统。湍流结构的详细映射表明，该系统遵守标准的网格搅拌湍流的比例关系，并产生均匀的，各向同性的湍流。该装置用于模拟明渠水流（OCF）和均匀湍流的TKE和泥沙负荷剖面。通过适当选择网格间距和频率，该装置可以模拟OCF系统中湍流强度的指数衰减规律。在均匀和OCF湍流条件下，DTC中获得的泥沙剖面准确地遵循传统理论。这些实验表明，DTC反应器可以设计成定量模拟湍流强度和泥沙负荷与水生系统。
A differential-turbulence column (DTC) has been designed to simulate hydrodynamic and chemical processes associated with pollutant fate in aquatic environments. The reactor uses five vertically spaced oscillating grids to simulate turbulence in natural hydrodynamic systems. Measurements of hydrodynamic and chemical reactions can be obtained from supporting instruments. The homogeneous turbulent kinetic energy (TKE) field produced by the DTC when all grids operated identically was compared to established grid-stirred systems. Detailed mapping of the turbulence structure indicated that the system obeys standard scaling relations for grid-stirred turbulence and produces homogeneous, isotropic turbulence. The apparatus was used to simulate TKE and sediment-loading profiles for open-channel flow (OCF) and homogeneous turbulence. Through the appropriate selection of grid stroke and frequency, the apparatus can be made to mimic the exponential-decay law associated with turbulence intensity in OCF systems. Under homogeneous and OCF turbulent conditions, sediment profiles obtained in the DTC accurately followed conventional theory. These experiments suggest that a DTC reactor can be designed to quantitatively simulate turbulence intensity and sediment loading associated with aquatic systems.