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arXiv 1702.04332physics.flu-dyn
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非线性流固耦合的自适应降阶建模

Adaptive Reduced-Order Modeling for Non-Linear Fluid-Structure Interaction

Ali Thari, Vito Pasquariello, Niels Aage, Stefan Hickel

摘要:

提出了一种自适应降阶模型,用于复杂非线性变形的流固耦合问题的有效时间分辨仿真。该模型是基于结构平衡方程的重复线性化。在每个线性化步骤中,未知数的数量大大减少,通过使用模态减少,这导致了计算效率的大幅提高。通过自适应重新校准和截断增强,每当超过无量纲变形阈值,我们确保减少模态基础保持任意精度的小和大的变形。我们的新模型被嵌入到一个分区,松散耦合的有限体积-有限元框架,其中的欧拉流体求解器内的结构界面运动是由保守的割元浸没边界法。应用于超音速平板的气动弹性不稳定性、置于激波管中的弹性壁板以及充气薄半球的激波诱导屈曲,证明了该方法的有效性和准确性。

英文摘要:

We present an adaptive reduced-order model for the efficient time-resolved simulation of fluid-structure interaction problems with complex and non-linear deformations. The model is based on repeated linearizations of the structural balance equations. Upon each linearization step, the number of unknowns is strongly decreased by using modal reduction, which leads to a substantial gain in computational efficiency. Through adaptive re-calibration and truncation augmentation whenever a non-dimensional deformation threshold is exceeded, we ensure that the reduced modal basis maintains arbitrary accuracy for small and large deformations. Our novel model is embedded into a partitioned, loosely coupled finite volume - finite element framework, in which the structural interface motion within the Eulerian fluid solver is accounted for by a conservative cut-element immersed-boundary method. Applications to the aeroelastic instability of a flat plate at supersonic speeds, to an elastic panel placed within a shock tube, and to the shock induced buckling of an inflated thin semi-sphere demonstrate the efficiency and accuracy of the method.

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