ESTIMATING UNCERTAINTY IN COMPUTATIONS OF 2-DIMENSIONAL SEPARATED FLOWS

被引:18
作者
DEMUREN, AO
WILSON, RV
机构
[1] Department of Mechanical Engineering, Old Dominion University, Norfolk, VA
来源
JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME | 1994年 / 116卷 / 02期
关键词
D O I
10.1115/1.2910257
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
The present paper investigates sources of uncertainties in two-dimensional flow computations and presents methods for estimating them. A sample problem is used for illustration. The following categories are explored in detail: (i) Uncertainly due to truncation error in numerical schemes: (ii) Uncertainty due to discretization error: (iii) Uncertainty due to outflow boundary conditions, (iv) Uncertainty due to incomplete iterative convergence; (v) Uncertainty due to computational grid aspect ratio. The error estimates are based on requirements for internal consistencies in computed results. Therefore, they provide better judgement of the numerical solution integrity than comparisons to experimental data or ''benchmark'' solutions whose reliability may sometimes be questionable. Ideally, both approaches should be employed. A new method is presented for estimating the optimum grid-cell aspect ratio for computational accuracy and efficiency.
引用
收藏
页码:216 / 220
页数:5
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