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首页> 外文期刊>Numerical Heat Transfer, Part A. Application: An International Journal of Computation and Methodology >Large-Eddy Simulations of heated flows in ribbed channels with spanwise rotation
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Large-Eddy Simulations of heated flows in ribbed channels with spanwise rotation

机译：带有枝条旋转的罗纹通道中加热流动的大涡流模拟

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We report on the outcome of a computational study of heat and momentum transport in a heated ribbed straight channel rotated about a span-wise axis. The flow is of both practical and fundamental interest, the latter due to the simultaneous presence in this flow of a number of complicating effects. These include system rotation, mean-flow unsteadiness, large-scale flow separation, and subsequent reattachment; their interactions severely distort the turbulence structure and thus pose this flow as a challenge to engineering prediction methods. In this study, the predictions were obtained using Large-Eddy Simulations with the objectives of assessing the performance of this approach in this flow, and gaining better understanding of the factors that influence the quality of the solutions. Thus, the numerical accuracy of the simulations was determined using Grid Convergence Index (GCI) method, and additionally by comparing results obtained using discretization schemes of different orders of accuracy. The dependence of the computed results on the models for the sub-grid scale correlations in both the momentum and thermal energy equations was checked by performing computations with alternative closure assumptions. These included the Smagorinsky and the dynamic models for momentum, and both linear and non-linear models for the thermal energy fluxes. The computations, which were performed with OpenFOAM, were compared with benchmark experimental data from both heated and isothermal flows. The correspondence between predictions and measurements was generally satisfactory but some important differences remain. It is argued that these are in part due to ambiguities in the way in which temporal and spatial averages are obtained in the computations and in the measurements.
机译：我们报告了在绕跨度轴线旋转的加热肋直流轴上的热和动量输送的计算研究的结果。该流动具有实用性和根本的兴趣，后者由于这种流动的同时存在许多复杂的效果。这些包括系统旋转，平均流量不稳定，大规模流分离，以及随后的重新附着;它们的相互作用严重扭曲了湍流结构，从而将这种流量构成为对工程预测方法的挑战。在这项研究中，使用大涡模拟获得了预测，其目的是评估这种方法在这种流程中的性能的目标，并获得更好地了解影响解决方案质量的因素。因此，使用电网会聚指数（GCI）方法确定模拟的数值准确性，并且另外通过比较使用不同准确性顺序的离散化方案获得的结果进行比较。通过执行具有替代闭合假设的计算，通过执行计算来检查计算结果对动量和热能方程中的子网格刻度相关性的模型的依赖性。这些包括SMAGORINSKY和动力模型，用于热能通量的线性和非线性模型。将使用OpenFoam执行的计算与来自加热和等温流的基准实验数据进行比较。预测和测量之间的对应关系通常是令人满意的，但仍然存在一些重要的差异。认为这些是由于在计算中和测量中获得的时间和空间平均值的方式含糊不清。

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