Sivel, Pierre und Frey, Christian (2022) Low Mach preconditioned non-reflecting boundary conditions for the harmonic balance solver. ECCOMAS 2022, 6.-9. Jun 2022, Oslo, Norvegen.
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Kurzfassung
In CFD, unsteady computations are cost-intensive. The HB method represents a cost-efficient alternative. Here, for time-periodic flows, the governing equations are recasted in the Fourier domain. In the low Mach regime, the compressible governing equations are stiff. Therefore, density-based solvers converge slowly. Low Mach preconditioning equalizes the eigenvalues of the system of equations, to improve the condition number and remove the stiffness of the system. In this paper, low Mach preconditioning is applied to the HB method, with emphasis on the NRBCs. These boundary conditions have a crucial impact on the flow inside the truncated computational domains used in CFD. Improper boundary conditions reflect waves exiting the computational domain and deteriorate the quality of the solution. However,NRBCs avoid spurious reflections. We explain that to precondition the NRBC its formulation in terms of characteristics has to be adapted. An academic wave propagation test case is computed for different wave configurations to validate the preconditioned boundary conditions. The use of non-preconditioned NRBCs in a preconditioned computation leads to instabilities and reflections at the boundaries of the domain. A consistent setup with preconditioned NRBCs improves the stability and leads to good non-reflecting properties for all presented wave configurations.
elib-URL des Eintrags: | https://elib.dlr.de/187053/ | ||||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||||
Titel: | Low Mach preconditioned non-reflecting boundary conditions for the harmonic balance solver | ||||||||||||
Autoren: |
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Datum: | 2022 | ||||||||||||
Referierte Publikation: | Ja | ||||||||||||
Open Access: | Nein | ||||||||||||
Gold Open Access: | Nein | ||||||||||||
In SCOPUS: | Nein | ||||||||||||
In ISI Web of Science: | Nein | ||||||||||||
Status: | akzeptierter Beitrag | ||||||||||||
Stichwörter: | Computational Fluid Dynamics, Low Mach Preconditioning, Non-Reflecting Boundary Conditions, Harmonic Balance | ||||||||||||
Veranstaltungstitel: | ECCOMAS 2022 | ||||||||||||
Veranstaltungsort: | Oslo, Norvegen | ||||||||||||
Veranstaltungsart: | internationale Konferenz | ||||||||||||
Veranstaltungsdatum: | 6.-9. Jun 2022 | ||||||||||||
HGF - Forschungsbereich: | Luftfahrt, Raumfahrt und Verkehr | ||||||||||||
HGF - Programm: | Luftfahrt | ||||||||||||
HGF - Programmthema: | Umweltschonender Antrieb | ||||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||||
DLR - Forschungsgebiet: | L CP - Umweltschonender Antrieb | ||||||||||||
DLR - Teilgebiet (Projekt, Vorhaben): | L - Virtuelles Triebwerk | ||||||||||||
Standort: | Köln-Porz | ||||||||||||
Institute & Einrichtungen: | Institut für Antriebstechnik > Numerische Methoden | ||||||||||||
Hinterlegt von: | Sivel, Pierre | ||||||||||||
Hinterlegt am: | 23 Jun 2022 12:52 | ||||||||||||
Letzte Änderung: | 29 Mär 2023 00:51 |
Verfügbare Versionen dieses Eintrags
- Low Mach preconditioned non-reflecting boundary conditions for the harmonic balance solver. (deposited 23 Jun 2022 12:52) [Gegenwärtig angezeigt]
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