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首页> 外文期刊>Journal of Computational Physics >Prediction of wall-pressure fluctuation in turbulent flows with an immersed boundary method
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Prediction of wall-pressure fluctuation in turbulent flows with an immersed boundary method

机译：浸入边界法预测湍流壁压力波动

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摘要

The objective of this paper is to assess the accuracy and efficiency of the immersed boundary (IB) method to predict the wall pressure fluctuations in turbulent flows, where the flow dynamics in the near-wall region is fundamental to correctly predict the overall flow. The present approach achieves sufficient accuracy at the immersed boundary and overcomes deficiencies in previous IB methods by introducing additional constraints - a compatibility for the interpolated velocity boundary condition related to mass conservation and the formal decoupling of the pressure on this surfaces. The immersed boundary-approximated domain method (IB-ADM) developed in the present study satisfies these conditions with an inexpensive computational overhead. The IB-ADM correctly predicts the near-wall velocity, pressure and scalar fields in several example problems, including flows around a very thin solid object for which incorrect results were obtained with previous IB methods. In order to have sufficient near-wall mesh resolution for LES and DNS computations, the present approach uses local mesh refinement. The present method has been also successfully applied to computation of the wall-pressure space-time correlation in DNS of turbulent channel flow on grids not aligned with the boundaries. When applied to a turbulent flow around an airfoil, the computed flow statistics - the mean/RMS flow field and power spectra of the wall pressure - are in good agreement with experiment.
机译：本文的目的是评估沉浸边界（IB）方法预测湍流中壁压力波动的准确性和效率，其中近壁区域中的流动动力学是正确预测整体流量的基础。本方法通过引入额外的约束-与质量守恒有关的内插速度边界条件的相容性以及该表面上压力的正式去耦，在沉浸边界上实现了足够的精度，并克服了以前的IB方法的不足。本研究中开发的浸入式边界近似域方法（IB-ADM）满足了这些条件，并且计算开销很小。 IB-ADM可以正确预测几个示例问题中的近壁速度，压力和标量场，包括围绕非常薄的固体物体的流动，而使用先前的IB方法获得的结果不正确。为了具有用于LES和DNS计算的足够的近壁网格分辨率，本方法使用局部网格细化。本方法也已成功地应用于在不与边界对齐的网格上湍流通道的DNS中壁压时空相关性的计算。当将其应用于翼型周围的湍流时，计算出的流量统计数据（均值/ RMS流场和壁压力的功率谱）与实验非常吻合。

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