0
Research Papers

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

[+] Author and Article Information
M. Sergio Campobasso1

School of Engineering, University of Glasgow, James Watt Building South, University Avenue, Glasgow G12 8QQ, United KingdomSergio.campobasso@glasgow.ac.uk

Mohammad H. Baba-Ahmadi

School of Engineering, University of Glasgow, James Watt Building South, University Avenue, Glasgow G12 8QQ, United KingdomMohammad.BabaAhmadi@glasgow.ac.uk

1

Corresponding author.

J. Turbomach 133(4), 041010 (Apr 20, 2011) (9 pages) doi:10.1115/1.4002985 History: Received June 28, 2010; Revised July 04, 2010; Published April 20, 2011; Online April 20, 2011

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.

FIGURES IN THIS ARTICLE
<>
Copyright © 2011 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Cell and face setup of inflow boundary

Grahic Jump Location
Figure 2

Cell and face setup of outflow boundary

Grahic Jump Location
Figure 3

Streamlines and isomach lines of cylindrical and spherical source flows

Grahic Jump Location
Figure 4

Computational domains: (a) three selected duct geometries and (b) duct Γ1 meshed with 25×13 computational grid

Grahic Jump Location
Figure 5

Mach contour plots of duct Γ1: (a) 2D axisymmetric setup and (b) 2D planar setup

Grahic Jump Location
Figure 6

Mach contour plots of duct Γ2: (a) 2D axisymmetric setup and (b) 2D planar setup

Grahic Jump Location
Figure 7

Mach contour plots of duct Γ3: (a) 2D axisymmetric setup and (b) 2D planar setup

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