UDNS or LES, That Is the Question

• 作者: Abdelouahab Dehbi Christoph Bosshard Emmanuel Leriche Michel O. Deville
• 来源期刊: 流体动力学(英文)
• 学科: 医学
• 关键词: Spectral Element Method Under-Resolved Direct Numerical SIMULATION Large EDDY SIMULATION Lid-Driven CAVITY DIFFERENTIALLY Heated CAVITY
• 年，卷（期）: 2015,（4）
• 页码范围: 339-352
• 页数: 14页
• 分类号: R73

摘要

In the framework of the spectral element method, a comparison is carried out on turbulent first-and second-order statistics generated by large eddy simulation (LES), under-resolved (UDNS) and fully resolved direct numerical simulation (DNS). The LES is based on classical models like the dynamic Smagorinsky approach or the approximate deconvolution method. Two test problems are solved: the lid-driven cubical cavity and the differentially heated cavity. With the DNS data as benchmark solutions, it is shown that the numerical results produced by the UDNS calculation are of the same accuracy, even in some cases of better quality, as the LES computations. The conclusion advocates the use of UDNS and calls for improvement of the available algorithms.