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2020 | OriginalPaper | Chapter

8. Numerische Strömungsberechnungen

Author : Johann Friedrich Gülich

Published in: Kreiselpumpen

Publisher: Springer Berlin Heidelberg

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Zusammenfassung

Kommerzielle Programme zur numerischen Lösung der Navier-Stokes-Gleichungen für 3D- Strömungen (3D-NS) werden universell eingesetzt. Theorie und Instruktionen für den Programmeinsatz erhält der Anwender aus der Programmdokumentation. Kapitel 8 konzentriert sich daher eher auf Besonderheiten und Probleme beim Einsatz von 3D-NS für verzögerte Strömungen auf gekrümmten Bahnen in Kreiselpumpen, bei denen die Wechselwirkung zwischen Haupt- und Radseitenraumströmung (sowie Leckströme durch Spaltdichtungen) erschwerend hinzukommen. Turbulenzmodellierung und Wandgesetze können diese Strömungen nur unvollkommen beschreiben, da sie aus einfachen Geometrien abgeleitet wurden. Zwei-Phasen- und Kavitationsströmungen steigern diese Schwierigkeiten erheblich. Fokus-Themen: Berechnungsstrategien, Unsicherheiten, Fehlerquellen, Qualitätssicherung bei CFD-Rechnungen, Vergleich zwischen Rechnung und Messung, Genauigkeit numerischer Berechnungen, empfohlene CFD-Rechenparameter sowie Postprozessing und Kriterien für die Beurteilung numerischer Berechnungen.

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Footnotes
1
Die Abbruchfehlerordnung allein bestimmt noch nicht die Genauigkeit; sie sagt nur aus, dass mit zunehmender Netzdichte die exakte Lösung schneller erreicht wird.
 
2
Bei den Untersuchungen in [30, 41] reagierten die Rechenergebnisse wenig empfindlich auf die Turbulenzparameter. Dieser Befund wird durch CFD-Rechnungen in [5] bestätigt.
 
3
Diese Aussage wird durch die Messungen in [59] bestätigt.
 
4
So betrugen z. B. die in [43] Kap. 9 mit CFD berechneten Radreibungsverluste glatter Scheiben nur etwa 10 % der nach Gl. (T3.6.11) zu erwartenden Werte, die durch verschiedene Messungen bestätigt wurden.
 
5
Mitunter wird in Publikationen nicht streng zwischen Begriffen wie der „Förderhöhe der Pumpe“ und dem „Totaldruck des Laufrades“ (oder den entsprechenden Wirkungsgraden) unterschieden, was entsprechende Vergleiche an sich gegenstandslos macht.
 
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Metadata
Title
Numerische Strömungsberechnungen
Author
Johann Friedrich Gülich
Copyright Year
2020
Publisher
Springer Berlin Heidelberg
DOI
https://doi.org/10.1007/978-3-662-59785-9_8