论文标题
通过对轴对称管流和传热的多刻度分析来选择湍流模型
Selection of turbulence models via multiscaling analysis of an axisymmetric pipe flow and heat transfer
论文作者
论文摘要
为了充分评估湍流，直接数值模拟（DNS）是迄今为止最准确的方法，需要相当大的计算能力和时间。对于行业标准而言并不是最佳的。开发替代模型，以合理的准确性提供结果将解决此问题。 Reynolds平均Navier Stokes（RANS）建模已证明其在解决这一现象方面的价值。在这项研究中，我们研究了Comsol的湍流模型，用于在二维轴对称管道结构域中完全开发的单相流量，并在壁上恒定加热，并在入口和出口处进行周期性的边界条件。已经添加了流体模块中的传热以解决传热现象。我们使用现有DNS数据评估了计算结果，以匹配RANS模型的准确性。对摩擦雷诺数的数量进行了贷款模拟，即re_τ= 180、314和395，具有不同的prandtl数字，即Pr = 0.71、2、5和7。流动的内部，外部和中间量表中的多识别分析对于流体和中等的传输范围，即表示，即表示，即表示，即均等，即，RES。平均流向温度和湍流通量，以与DNS数据进行比较。调查报告了缩放分析的有效性，并表明可以使用湍流模型来以合理的准确性来描述这种流程。
To fully evaluate a turbulent flow, Direct Numerical Simulation (DNS) is the most accurate method by far and requires considerable computational power and time; not optimum for industry standards. Developing an alternative model, providing results with reasonable accuracy would resolve this issue. Reynolds Averaged Navier Stokes (RANS) modeling has proven its worth in addressing this phenomenon. In this study, we investigated the RANS turbulence models from COMSOL for fully developed single-phase flow in a two-dimensional axisymmetric pipe domain with constant heating at the wall and periodic boundary conditions at the inlet and outlet. Heat transfer in the fluid module has been added to address the heat transfer phenomenon. We evaluated the computed results with existing DNS data to match the accuracy of the RANS models. RANS simulations are conducted for friction Reynolds number, i.e., Re_τ= 180, 314, and 395 with varying Prandtl numbers, i.e., Pr = 0.71, 2, 5, and 7. Multiscaling analyses in the flow's inner, outer, and meso scaling regions are performed for fluid and heat transfer profiles, i.e., mean streamwise velocity, Reynolds shear stress, mean streamwise temperature, and turbulent heat flux, to compare with the DNS data. The investigation reports the scaling analysis's effectiveness and shows that RANS turbulence models can be used to describe such flow with reasonable accuracy.
