A Bypass Transition Model Based on the Intermittency Function
A Bypass Transition Model Based on the Intermittency Function
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DOI：
10.1007/s10494-014-9533-9
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发表时间：
2014-04
期刊：
影响因子：
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通讯作者：
Xuan Ge;Sunil K. Arolla;P. Durbin
中科院分区：
文献类型：
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作者：
Xuan Ge;Sunil K. Arolla;P. Durbin
本文提出了一种用局部变量表示的雷诺平均纳维尔-斯托克斯（RANS）计算中的旁路转捩模型。不使用外部数据相关性来修复转换。跃迁是由扩散开始的，源项将跃迁进行到底。在转捩前的层流区引入汇项，在湍流区汇项消失。源和汇都是壁距雷诺数和湍流尺度的函数。对分离边界层转捩的预测作了修正。转捩模型与k −ωRANS模型相结合。本模型被实现为通用的计算流体动力学（CFD）代码。通过几个测试案例对模型进行了验证。在一系列流量中观察到与现有数据相当一致。
An intermittency model that is formulated in local variables is proposed for representing bypass transition in Reynolds-Averaged Navier-Stokes (RANS) computations. No external data correlation is used to fix transition. Transition is initiated by diffusion, and a source term carries it to completion. A sink term is created to predict the laminar region before transition, then it vanishes in the turbulent region. Both the source and sink are functions of a wall-distance Reynolds number and turbulence scale. A modification is introduced to predict transition in separated boundary layers. The transition model is incorporated with thek−ωRANS model. The present model is implemented into a general purpose, computational fluid dynamics (CFD) code. The model is validated with several test cases. Decent agreement with the available data is observed in a range of flows.