A computational slip boundary condition for near-wall turbulence modeling
A computational slip boundary condition for near-wall turbulence modeling
复制标题
近壁湍流建模的计算滑移边界条件
DOI：
10.1016/j.compfluid.2022.105628
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发表时间：
2022
影响因子：
2.8
通讯作者：
Lyu S
中科院分区：
文献类型：
--
作者：
Lyu S
近壁湍流模拟是计算流体力学的挑战之一。为了解决这个问题，近壁非重叠区域分解（NDD）方法被证明是非常有效的。它已成功地用于不同的雷诺平均Navier-Stokes模型。在NDD中，计算域被分成两个不重叠的子域：靠近壁的内部区域，其特征在于高梯度，和外部区域。为了简化求解，在内部区域可以使用薄层模型。在这种情况下，NDD表示精度和计算时间之间的权衡。它已被证明在众多的测试用例，NDD是能够节省高达一个数量级的计算时间，同时保持实际的高精度。该算法的一个实际缺点是需要将计算域分成两个区域。在本文中，第一次实现的NDD隐式。为此，在壁面处导出了Robin型的特定边界条件。这种边界条件减小了壁面附近解的梯度。其关键特性是可以在相对粗糙的网格上获得解，然后在内部区域重新计算。在该方法中，它是保证原始的外部和更新的内部解决方案是光滑连接。新的边界条件下的算法可以很容易地在标准代码中实现。这是用代码OpenFOAM演示的。此外，本文还实现了一种更精确的内区域求解方法。整个技术的效率证明了在通道和非对称扩散器中的湍流建模的测试用例。
Near-wall turbulence modeling represents one of challengers in the computational fluid dynamics. To tackle this problem, the near-wall non-overlapping domain decomposition (NDD) method proved to be very efficient. It has been successfully used with different Reynolds-averaged Navier–Stokes models. In NDD the computational domain is split into two non-overlapping sub-domains: an inner region near the wall, which is characterized by high gradients, and the outer region. To simplify the solution, in the inner region the thin-layer model can be used. In this case, NDD represents a trade-off between the accuracy and computational time. It has been demonstrated on numerous test cases that NDD is able to save up to one order of computational time while retaining practically high accuracy. A practical drawback of the algorithm is a need to split the computational domain into two regions. In the present paper, for the first time the NDD is realized implicitly. For this purpose, specific boundary conditions of Robin type are derived at the wall. Such boundary conditions reduce the gradients of the solution near the wall. The key property is that the solution can be obtained on a relatively coarse grid and then be recalculated in the inner region. In the approach it is guaranteed that the original outer and updated inner solutions are linked smoothly. The algorithm with the new boundary conditions can be easily implemented in standard codes. This is demonstrated with the code OpenFOAM. In addition, in the paper a more accurate approach to obtain the solution in the inner region is realized. The efficiency of the entire technique is demonstrated on test cases with modeling turbulent flows in a channel and asymmetric diffuser.
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影响因子：
2.8
作者：
M. Petrov;S. Utyuzhnikov;A. Chikitkin;V. Titarev
通讯作者：
V. Titarev
用于模拟本质上不稳定的近壁湍流的非重叠域分解
影响因子：
2.8
作者：
A. Chikitkin;Sergey Utyuzhnikov;M. Petrov;Vladimir Titarev
通讯作者：
Vladimir Titarev
构建和实现用于近壁湍流建模的壁函数的一些新方法
DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
S. Utyuzhnikov
通讯作者：
S. Utyuzhnikov
DOI：
10.1063/1.168744
发表时间：
1998-11-01
期刊：
COMPUTERS IN PHYSICS
影响因子：
--
作者：
Weller, HG;Tabor, G;Fureby, C
通讯作者：
Fureby, C
DOI：
--
发表时间：
2012
期刊：
影响因子：
--
作者：
S. Utyuzhnikov
通讯作者：
S. Utyuzhnikov