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首页> 外文期刊>International Journal of Heat and Fluid Flow >Measurements to assess simple RANS model behaviour in stagnating flow
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Measurements to assess simple RANS model behaviour in stagnating flow

机译：评估滞流中简单RANS模型行为的测量

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摘要

The performance of several turbulence closure models in stagnating turbulent flow is investigated and their deficiencies identified. The simulations are compared with new measurements of the two-dimensional stagnation flow on a flat plate in a wind tunnel obtained using stereo-particle image velocimetry. Numerical solutions to the Poisson equation for the instantaneous pressure allowed all pressure-velocity correlations to be estimated and then separated into their linear (mean strain rate dependent) and nonlinear contributions. Reynolds-averaged Navier-Stokes (RANS) turbulence models were investigated because of their widespread use in, for example, urban wind flow simulations, where impinging flow is common. The models tested are the k - epsilon and some variants as well as a common Reynolds stress model with and without wall reflection. As is well-known from previous studies, the k - epsilon model over-predicted k. Durbin's modified eddy viscosity reduces, but does not correct this over-prediction. The dominance of the turbulent diffusion in the turbulent kinetic energy equation near the wall was not reproduced by any of the gradient diffusion models, suggesting major deficiencies in the modeled terms.
机译：研究了几种湍流闭合模型在停滞湍流中的性能，并确定了它们的不足。将模拟与使用立体粒子图像测速仪获得的风洞平板中二维停滞流的新测量结果进行比较。泊松方程的瞬时压力数值解可以估算所有压力-速度相关性，然后将其分为线性（取决于平均应变速率）和非线性影响。对雷诺平均的Navier-Stokes（RANS）湍流模型进行了研究，因为它们广泛用于例如撞击流很常见的城市风流模拟中。测试的模型是k-epsilon和一些变体，以及带有和不带有壁反射的常见雷诺应力模型。从先前的研究众所周知，k-epsilon模型高估了k。 Durbin的改良涡流粘度会降低，但不能纠正这种过高的预测。壁面附近的湍动能方程中湍流扩散的优势并未通过任何梯度扩散模型重现，这表明在建模方面存在重大缺陷。

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