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Accuracy of numerically evaluated flutter derivatives of bridge deck sections using RANS: Effects on the flutter onset velocity

机译：使用RANS对桥面截面进行数值评估的颤振导数的准确性：对颤振起伏速度的影响

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摘要

In this article, the accuracy of standard computational fluid dynamics techniques and turbulence models in predicting the critical flutter speed of streamlined and bluff deck sections is investigated. It is well known that such numerical tools can provide inaccurate prediction of the flow field around bluff bodies which reflects in biases in their aeroelastic behavior. Aiming at systematically study the effects of such inaccuracies, in this article, six deck sections are analyzed by numerically extracting flutter derivatives and calculating the critical flutter speed for a set of representative test structures. It is shown that the flutter onset velocity is mainly underestimated but cases showing opposite behavior are identified and discussed. Two simulation strategies are adopted: the differences in the flutter mechanism between such two approaches are taken as an indicator of possible strong inaccuracies. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在本文中，研究了标准计算流体动力学技术和湍流模型在预测流线型和钝壁甲板截面的临界扑动速度方面的准确性。众所周知，这样的数值工具会提供对阻流体的流场的不准确预测，这反映了其气弹行为的偏差。为了系统地研究此类误差的影响，在本文中，通过数值提取颤振导数并计算一组代表性测试结构的临界颤振速度，对六个甲板截面进行了分析。结果表明，颤振起伏速度主要被低估了，但发现并讨论了行为相反的情况。采用了两种仿真策略：这两种方法之间的颤振机制差异被视为可能存在严重误差的指标。 （C）2015 Elsevier Ltd.保留所有权利。

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