MODELLING THE ENTRANCE REGION IN A PLANE ASYMMETRIC DIFFUSER BY ELLIPTIC RELAXATION
MODELLING THE ENTRANCE REGION IN A PLANE ASYMMETRIC DIFFUSER BY ELLIPTIC RELAXATION
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通过椭圆松弛对平面不对称扩散器中的入口区域进行建模
DOI：
10.1615/tsfp4.1970
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
L. Davidson
中科院分区：
文献类型：
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作者：
A. Sveningsson;B. A. Pettersson;L. Davidson
非对称扩散器内的流动采用Pettersson-Reif(2000)提出的非线性V2F模型进行计算。与两种线性涡粘性模式的计算结果进行了比较，并用大涡模拟结果进行了验证。对
结果表明，该方程在扩散器流动中确实起着重要的作用。结果表明，非线性关系改善了单个雷诺应力分量的表示，但恶化了平均流动的预测。因此，在确定控制扩散器内流动演变的基本机制上花费了相当大的努力。结果表明，扩散器入口区雷诺应力的近壁解析是至关重要的。
The flow in an asymmetric diffuser is computed with the non-linear V2F model suggested by Pettersson-Reif (2000). Its performance is compared with that of two linear eddy-viscosity models and all results are validated against the LES of \cite{kaltenbach99}. Several modifications to the
$\varepsilon$ equation are considered and it is shown that this equation indeed plays an important role in the diffuser flow. It is shown that the non-linear relation improves the representation of the individual Reynolds stress components but deteriorates the predictions of the mean flow. Therefore an appreciable effort is spent on identifying the underlying mechanisms that control the evolution of the flow in the diffuser. It is shown that the near-wall resolution of the Reynolds stresses in the entrance region of the diffuser is of essential importance.