0
RESEARCH PAPERS

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

Abstract

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
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In