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Numerical Investigation on the Salient Features of Flow over Standard Notchback Configurations using Scale Resolving Simulations
Computers & Fluids ( IF 2.5 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.compfluid.2020.104666
K.K. Chode , H. Viswanathan , K. Chow

Abstract We present a detailed numerical investigation on the salient features of flow over an SAE reference body with several backlight angles representing a standard notchback geometry using Scale Resolving Simulations (SRS) such as the SBES and the SDES. A grid evaluation study is performed for the SAE Notchback geometry with 20° backlight angle with a Reynolds number (Re) of 6.57 × 105 based on the height of the body. Various aerodynamic parameters and flow structures are compared against the previously published experimental results to evaluate the performance of the numerical predictions and against the unsteady k – ω SST model. Both SBES and SDES models agree well with the previously published wind tunnel results, exhibit a well-preserved modelled RANS layer, and numerically show minor differences between them. However, the transition from RANS to LES in the separated shear layer (SSL) appears to be marginally robust with SBES. Our numerical results demonstrate that with an increase in the backlight angle, the strength of trailing vortex tends to reduce on one side compensated by an increase on the other side of the model. As a consequence, the SSL shows a non-symmetrical flow feature behind the vehicle for the backlight angles of 30° and 40° as detailed in the experimental result and suitably predicted by the numerical results. We highlight that within the scope of this study, both the SRS models have shown to be accurate and reliable in predicting the aerodynamic force coefficients and flow features observed in experiments.

中文翻译:

使用尺度解析模拟对标准槽口结构上流动的显着特征进行数值研究

摘要 我们使用标度解析模拟 (SRS)(例如 SBES 和 SDES),对 SAE 参考体上流动的显着特征进行了详细的数值研究,该参考体具有几个代表标准凹口几何的背光角度。对 SAE Notchback 几何结构进行了网格评估研究,背光角度为 20°,雷诺数 (Re) 为 6.57 × 105,基于身体的高度。将各种空气动力学参数和流动结构与先前公布的实验结果进行比较,以评估数值预测的性能和非定常 k – ω SST 模型。SBES 和 SDES 模型都与之前发布的风洞结果非常吻合,展示了一个保存完好的建模 RANS 层,并且在数值上显示了它们之间的细微差别。然而,在分离剪切层 (SSL) 中从 RANS 到 LES 的过渡似乎对 SBES 略显稳健。我们的数值结果表明,随着背光角度的增加,尾部涡流的强度在一侧趋于降低,而模型另一侧的增加则对此进行了补偿。因此,对于 30° 和 40° 的背光角,SSL 在车辆后方显示出非对称流动特征,如实验结果中详述的那样,并通过数值结果进行了适当的预测。我们强调,在本研究的范围内,两种 SRS 模型都已证明在预测实验中观察到的空气动力系数和流动特征方面是准确和可靠的。我们的数值结果表明,随着背光角度的增加,尾部涡流的强度在一侧趋于降低,而模型另一侧的增加则对此进行了补偿。因此,对于 30° 和 40° 的背光角,SSL 在车辆后方显示出非对称流动特征,如实验结果中详述的那样,并通过数值结果进行了适当的预测。我们强调,在本研究的范围内,两种 SRS 模型都已证明在预测实验中观察到的空气动力系数和流动特征方面是准确和可靠的。我们的数值结果表明,随着背光角度的增加,尾部涡流的强度在一侧趋于降低,而模型另一侧的增加则对此进行了补偿。因此,对于 30° 和 40° 的背光角,SSL 在车辆后方显示出非对称流动特征,如实验结果中详述的那样,并通过数值结果进行了适当的预测。我们强调,在本研究的范围内,两种 SRS 模型都已证明在预测实验中观察到的空气动力系数和流动特征方面是准确和可靠的。SSL 在 30° 和 40° 的背光角度下显示了车辆后方的非对称流动特征,如实验结果中所述,并通过数值结果进行了适当预测。我们强调,在本研究的范围内,两种 SRS 模型都已证明在预测实验中观察到的空气动力系数和流动特征方面是准确和可靠的。SSL 在 30° 和 40° 的背光角度下显示了车辆后方的非对称流动特征,如实验结果中所述,并通过数值结果进行了适当预测。我们强调,在本研究的范围内,两种 SRS 模型都已证明在预测实验中观察到的空气动力系数和流动特征方面是准确和可靠的。
更新日期:2020-10-01
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