%0 Journal Article
%T 复杂非对称岔管数值模拟中湍流模型的影响<br>Effect of turbulence models on the simulation of the flow in a complex asymmetric penstock
%A 陈文创
%A 张蕊
%A 张文远
%A 章晋雄
%A 张东
%J 清华大学学报（自然科学版）
%D 2018
%R 10.16511/j.cnki.qhdxxb.2018.26.037
%X 该文旨在探究湍流模型对复杂非对称岔管水力特性仿真的结果准确度和计算时间成本的影响。基于Reynolds时均Navier-Stokes（RANS）方程，利用剪切应力传输k-ω（SST k-ω）、标准k-ε（Sk-ε）、可实现k-ε（Rk-ε）、重整化群k-ε（RNG k-ε）和Reynolds应力模型（RSM）共5种不同湍流模型解决方程封闭性问题，深入对比分析基于各湍流模型模拟的流速场、紊动能场、水头损失和时间成本的差异。将计算结果与物理模型试验结果进行比较，发现基于各湍流模型的计算值与试验值偏差和计算效率均随着水流条件的不同而变化。总体而言，基于SST k-ω的模型计算效率较高，基于RSM的结果与试验值偏差较小。SST k-ω和RSM适合应用于求解类似复杂岔管的水力特性问题，可根据所具备的计算资源和对结果准确度要求在二者中选择。而RNG k-ε、Sk-ε和Rk-ε模型均不能较准确模拟岔管分流、汇流形态及引起的水头损失。<br>Abstract：This study analyzes the effects of various turbulence models on the hydrodynamic simulation accuracy and computing time for flow in a complex asymmetric penstock. The turbulence models used here for closure of the Reynolds-averaged Navier-Stokes (RANS) equations were the shear-stress-transport k-ω (SST k-ω), standard k-ε (Sk-ε), realizable k-ε (Rk-ε), renormalization group k-ε (RNG k-ε) and Reynolds stress model (RSM) models. The results show the differences in the velocity, turbulent kinetic energy, and water head loss predictions and the computing times for these five turbulence models. The predictions are compared with experimental data to show that the computing times and the differences between the numerical and experimental results vary with the flow conditions. The RSM results agree best with the experimental results, while the SST k-ω model costs less CPU time. Both the RSM and SST k-ω are found to be appropriate for calculating the hydraulic characteristics of the flow in the complex asymmetric penstock, depending on the available computing resources and the required accuracy. The Sk-ε, Rk-ε and RNG k-ε models all give lower accuracy predictions of the flow distribution, confluence and water head loss.
%K 非对称岔管
%K 水力特性
%K 湍流模型
%K 准确度
%K 计算时间
%K &lt
%K br&gt
%K asymmetric penstock
%K hydraulic characteristics
%K turbulence models
%K accuracy
%K computing time
%U http://jst.tsinghuajournals.com/CN/Y2018/V58/I8/752