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.
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e-mail: Sergio.campobasso@glasgow.ac.uk
e-mail: Mohammad.BabaAhmadi@glasgow.ac.uk
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October 2011
Research Papers
Ad-Hoc Boundary Conditions for CFD Analyses of Turbomachinery Problems With Strong Flow Gradients at Farfield Boundaries
M. Sergio Campobasso,
M. Sergio Campobasso
School of Engineering,
e-mail: Sergio.campobasso@glasgow.ac.uk
University of Glasgow
, James Watt Building South, University Avenue, Glasgow G12 8QQ, United Kingdom
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Mohammad H. Baba-Ahmadi
Mohammad H. Baba-Ahmadi
School of Engineering,
e-mail: Mohammad.BabaAhmadi@glasgow.ac.uk
University of Glasgow
, James Watt Building South, University Avenue, Glasgow G12 8QQ, United Kingdom
Search for other works by this author on:
M. Sergio Campobasso
School of Engineering,
University of Glasgow
, James Watt Building South, University Avenue, Glasgow G12 8QQ, United Kingdome-mail: Sergio.campobasso@glasgow.ac.uk
Mohammad H. Baba-Ahmadi
School of Engineering,
University of Glasgow
, James Watt Building South, University Avenue, Glasgow G12 8QQ, United Kingdome-mail: Mohammad.BabaAhmadi@glasgow.ac.uk
J. Turbomach. Oct 2011, 133(4): 041010 (9 pages)
Published Online: April 20, 2011
Article history
Received:
June 28, 2010
Revised:
July 4, 2010
Online:
April 20, 2011
Published:
April 20, 2011
Citation
Campobasso, M. S., and Baba-Ahmadi, M. H. (April 20, 2011). "Ad-Hoc Boundary Conditions for CFD Analyses of Turbomachinery Problems With Strong Flow Gradients at Farfield Boundaries." ASME. J. Turbomach. October 2011; 133(4): 041010. https://doi.org/10.1115/1.4002985
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