Variational multiscale residual-based turbulence modeling for large eddy simulation of incompressible flows
Variational multiscale residual-based turbulence modeling for large eddy simulation of incompressible flows
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DOI：
10.1016/j.cma.2007.07.016
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发表时间：
2007-01-01
影响因子：
7.2
通讯作者：
Scovazzi, G.
中科院分区：
文献类型：
--
作者：
Bazilevs, Y.;Calo, V. M.;Scovazzi, G.
本文提出了一个LES型湍流变分多尺度理论。我们的方法完全来自不可压缩的Navier-Stokes方程，并没有采用任何ad hoe设备，如涡流粘度。我们测试了强制均匀各向同性湍流和湍流槽道流的配方。在计算中，我们采用了线性，二次和三次NURBS。一个简单的模型问题的色散分析显示，NURBS元素是上级到经典的有限元近似对流和扩散过程，这在湍流计算中起着重要的作用。数值结果是非常好的，证实了理论框架的可行性。(c)2007 Elsevier B. V.保留所有权利。
We present an LES-type variational multiscale theory of turbulence. Our approach derives completely from the incompressible Navier-Stokes equations and does not employ any ad hoe devices, such as eddy viscosities. We tested the formulation on forced homogeneous isotropic turbulence and turbulent channel flows. In the calculations, we employed linear, quadratic and cubic NURBS. A dispersion analysis of simple model problems revealed NURBS elements to be superior to classical finite elements in approximating advective and diffusive processes, which play a significant role in turbulence computations. The numerical results are very good and confirm the viability of the theoretical framework. (c) 2007 Elsevier B.V. All rights reserved.