Estimating Uncertainty in Computations of Two-Dimensional Separated Flows

[+] Author and Article Information
Ayodeji O. Demuren, Robert V. Wilson

Department of Mechanical Engineering, Old Dominion University, Norfolk, VA 23529

J. Fluids Eng 116(2), 216-220 (Jun 01, 1994) (5 pages) doi:10.1115/1.2910257 History: Received December 03, 1992; Revised March 18, 1994; Online May 23, 2008


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) Uncertainty 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.

Copyright © 1994 by The American Society of Mechanical Engineers
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