Ad-Hoc Boundary Conditions for CFD Analyses of Turbomachinery Problems With Strong Flow Gradients at Farfield Boundaries

Ad-Hoc Boundary Conditions for CFD Analyses of Turbomachinery Problems With Strong Flow Gradients at Farfield Boundaries
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远场边界强流动梯度涡轮机械问题 CFD 分析的临时边界条件

DOI:
10.1115/1.4002985
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发表时间:
2011
期刊:
Journal of Turbomachinery
影响因子:
--
通讯作者:
Campobasso M
Campobasso M
中科院分区:
--
文献类型:
--
作者:
Campobasso M

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本文对Euler和Navier-Stokes计算流体力学(CFD)程序的通量强制和辅助状态远场边界条件进行了改进。新的条件是基于一维特征数据,并在边界条件中引入了用于区域内部的数值格式的某些数值特征。当流场在远场边界处存在较强的流向梯度时,新条件的性能明显好于传统条件,因为它们(A)保持了空间离散的顺序,(B)大大减少了估计积分输出的误差。对有解析解的环形管道内可压缩流场进行粗网格CFD分析,其质量流量误差为62%或2%,这取决于采用最好还是最差的远场边界条件(BC)。提出的BC增强可以应用于结构化的、非结构化的、以单元为中心的和单元-顶点解算器。
This paper reports on the improvements of flux enforcement and auxiliary state farfield boundary conditions for Euler and Navier–Stokes computational fluid dynamics (CFD) codes. The new conditions are based on 1D characteristic data and also on the introduction in the boundary conditions of certain numerical features of the numerical scheme used for the interior of the domain. In the presence of strong streamwise gradients of the flow field at the farfield boundaries, the new conditions perform significantly better than their conventional counterparts in that they (a) preserve the order of the space-discretization and (b) greatly reduce the error in estimating integral output. A coarse-grid CFD analysis of the compressible flow field in an annular duct for which an analytical solution is available yields a mass flow error of 62% or 2%, depending on whether the best or the worst farfield boundary condition (BC) implementation is used. The presented BC enhancements can be applied to structured, unstructured, cell-centered, and cell-vertex solvers.
开发高效、准确的风力涡轮机非定常空气动力学 CFD 技术
DOI: --
发表时间: 2009
期刊:
影响因子: --
作者:
M. Campobasso;A. Bonfiglioli;M. Ahmadi
通讯作者: M. Ahmadi
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DOI: --
发表时间: 2009
期刊:
影响因子: --
作者:
A. Bonfiglioli;B. Carpentieri;S. Campobasso
通讯作者: S. Campobasso