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Low-Mach preconditioned boundary conditions for compressible solvers

Fiedler, Jens and di Mare, Francesca (2014) Low-Mach preconditioned boundary conditions for compressible solvers. 6th. European Conference on Computational Fluid Dynamics, 20.-25. Juli 2014, Barcelona, Spanien.

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Abstract

Approaching the incompressibility limit in CFD applications where compressible, density based solution methods are employed, is accompanied very often not only by slow convergence of the residuals but also by a strong degradation of the solution quality. This issue is particularly severe in turbo-machinery applications, where large variations of flow regimes occur. Low-Mach preconditioning methods can be applied to the Euler- and Navier-Stokes equations to alleviate such difficulties. As noted by several authors, these techniques can cause stability problems especially in proximity of the domain’s boundaries. In particular, it has been demonstrated that an appropriate scaling treatment is also required for characteristic-based boundary conditions. In the current work we present the theoretical development and application of preconditioned impermeable boundaries in combination with preconditioned far-field conditions in the in-house CFD code TRACE.

Document Type:Conference or Workshop Item (Speech)
Title:Low-Mach preconditioned boundary conditions for compressible solvers
Authors:
AuthorsInstitution or Email of Authors
Fiedler, JensDLR, Institute of Propulsion Technology
di Mare, FrancescaDLR, Institute of Propulsion Technology
Date:July 2014
Refereed publication:Yes
Status:Published
Keywords:Low-Mach precondition, compressible flows, preconditioned boundary conditions
Event Title:6th. European Conference on Computational Fluid Dynamics
Event Location:Barcelona, Spanien
Event Type:international Conference
Event Dates:20.-25. Juli 2014
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Numerical Methodes
Deposited By: Jens Fiedler
Deposited On:18 Aug 2014 10:42
Last Modified:18 Aug 2014 10:42

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