Accuracy and Coupling Issues of Aeroelastic Navier-Stokes Solutions on Deforming Meshes
Accuracy and Coupling Issues of Aeroelastic Navier-Stokes Solutions on Deforming Meshes
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DOI：
10.2514/2.2372
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发表时间：
1997-04
影响因子：
2.2
通讯作者：
S. Morton;R. Melville;M. Visbal
中科院分区：
文献类型：
--
作者：
S. Morton;R. Melville;M. Visbal
发展了一种隐式时间精度的气动弹性模拟方法，特别关注了时间精度、结构耦合、网格变形策略和几何守恒等问题。一种波束变暖的近似分解算法，被修改为包括类牛顿迭代，与结构模型耦合，也是以次迭代的形式。通过足够的子迭代次数，这种方法变成了一个完全隐式的一阶或二阶精度的气动弹性解算器。该解算器用于计算弹性安装圆柱体的时间精度解。全隐式耦合使得整个格式在时间上变得二阶精度，显著减少了给定精度的工作量。提出了一种新的代数网格变形策略，在大变形情况下保持网格在地表附近的正交性。最后，用该方法准确地再现了弹性安装圆柱体的振动行为，并与以往的实验和模拟结果进行了比较，结果令人满意。
An implicit time-accurate approach to aeroelastic simulation was developed with particular attention paid to the issues of time accuracy, structural coupling, grid-deformation strategy, and geometric conservation. A Beam ‐Warming, approximate-factored algorithm, modie ed to include Newton-like subiterations was coupled with a structural model, also in subiteration form. With a sufe cient number of subiterations, this approach becomes a fully implicit, e rst- or second-order-accurate aeroelastic solver. The solver was used to compute time-accurate solutions of an elastically mounted cylinder. The fully implicit coupling allowed the overall scheme to become second-order accurate in time, signie cantly reducing the workload for a given accuracy. A new algebraic grid deformation strategy was developed that preserves grid orthogonality near the surface under large deformations. Finally, the oscillatory behavior of an elastically mounted cylinder was reproduced accurately by the present approach, and results compared favorably to previous experiments and simulations.