New kind Baldwin-Lomax turbulence model under the limit of entropy
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摘要: 针对Baldwin-Lomax(BL)模型在模拟超声速复杂流动中的不足,提出一种基于熵限制的新型修正方式.分别采用原始的BL模型(BL-origin)、修正后的BL模型(BL-entropy)以及Wilcox k-ω两方程模型对超声速平板、超声速二维压缩拐角以及膨胀-压缩拐角3个典型算例进行计算,结果表明BL-entropy 能够较好地获取长度尺度进而得到均匀合理的涡粘性分布.同时,该修正方式简单高效并且适用于其他与超声速边界层有关的模型,具有较大的发展潜力.Abstract: A new kind correction to Baldwin-Lomax turbulence model (BL-entropy) based on the concept of entropy was proposed. The supersonic plane, two-dimensional supersonic compression corner and expansion-compression corner which were representative in the engineering area were chosen in the numerical simulation to evaluate the performance of this model. It is found that BL-entropy can conquer the essential deficiency of the original model by providing a more physically correct length scale in the supersonic complex flow. Moreover, this method is simple, computationally fast and general, making it applicable to other models related with the supersonic boundary layer.
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Key words:
- turbulence models /
- entropy /
- supersonic flows /
- computational fluid dynamics
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