Ad-hoc boundary conditions for CFD analyses of turbomachinery problems with strong flow gradients at Farfield boundaries

Campobasso, M.S., Baba-Ahmadi, M.H. and McLelland, G. (2011) Ad-hoc boundary conditions for CFD analyses of turbomachinery problems with strong flow gradients at Farfield boundaries. Journal of Turbomachinery, 133(4), (doi: 10.1115/1.4002985)

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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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Campobasso, Dr Michele
Authors: Campobasso, M.S., Baba-Ahmadi, M.H., and McLelland, G.
Subjects:T Technology > TL Motor vehicles. Aeronautics. Astronautics
College/School:College of Science and Engineering > School of Engineering > Autonomous Systems and Connectivity
Journal Name:Journal of Turbomachinery
Publisher:American Society of Mechanical Engineers
ISSN (Online):1528-8900
Published Online:20 April 2011

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
470951Enhancing aeromechanical analysis and design capabilities of wind turbine rotors by means of nonlinear frequency-domain computational fluid dynamicsMichele CampobassoEngineering & Physical Sciences Research Council (EPSRC)EP/F038542/1Systems Power and Energy