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Numerical investigation of twin-jet impingement with hybrid-type turbulence modeling

机译：基于混合湍流模型的双射流冲击的数值研究

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A Computational Fluid Dynamics (CFD) study of a twin-jet impingement is performed using the Reynolds-Averaged Navier-Stokes (RANS) approach with a dynamic Smagorinsky Large Eddy Simulation (LES). The use of a hybrid RANS-LES (i.e., part of the turbulence is modeled and part of the turbulence is resolved) method potentially offers a compromise between the computational efficiency and the accuracy comparable with that of a pure dynamic LES. In the current study, the SST-SAS (Shear-Stress transport with Scale-Adapted Simulation) k-omega model having hybrid RANS-LES characteristics is utilized for turbulence modeling. Effects of nozzle-to-plate (HID) and nozzle-to-nozzle (LID) distances on the pressure distribution and the heat transfer are investigated for 3 x 10(4) < Re < 5 x 10(4). Numerical results of SST-SAS and dynamic LES methods are validated against available experimental data. The flow expands radially as H/D increases. Results show that the SST-SAS model can produce fairly accurate results, especially with a lower H/D at which the sub-atmospheric region appears. In addition, the SST-SAS model is capable of predicting the peak values of local Nusselt number at correct locations. (C) 2014 Elsevier Ltd. All rights reserved.
机译：使用雷诺平均Navier-Stokes（RANS）方法和动态Smagorinsky大涡模拟（LES）对双射流撞击进行了计算流体动力学（CFD）研究。混合RANS-LES（即，对一部分湍流进行建模，对一部分湍流进行解析）方法的使用可能在计算效率和与纯动态LES相当的精度之间做出折衷。在当前的研究中，具有混合RANS-LES特性的SST-SAS（具有比例自适应模拟的剪切-应力运输）k-ω模型被用于湍流建模。对于3 x 10（4）

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