Verification and Validation of Large Eddy Simulation for Tip Clearance Vortex Cavitating Flow in a Waterjet Pump

In this paper, large eddy simulation (LES) was adopted to simulate the cavitating flow in a waterjet pump with emphasis on the tip clearance flow. The numerical results agree well with the experimental observations, which indicates that the LES method can make good predictions of the unsteady cavita...

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Autores principales:	Chengzao Han, Yun Long, Mohan Xu, Bin Ji
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	cavitation large eddy simulation (LES) verification and validation (V&V) vorticity transport equation entropy production waterjet pump Technology T
Acceso en línea:	https://doaj.org/article/faec8b2f482d4eee8c45c6465d42f85b
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spelling	oai:doaj.org-article:faec8b2f482d4eee8c45c6465d42f85b2021-11-25T17:27:26ZVerification and Validation of Large Eddy Simulation for Tip Clearance Vortex Cavitating Flow in a Waterjet Pump10.3390/en142276351996-1073https://doaj.org/article/faec8b2f482d4eee8c45c6465d42f85b2021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7635https://doaj.org/toc/1996-1073In this paper, large eddy simulation (LES) was adopted to simulate the cavitating flow in a waterjet pump with emphasis on the tip clearance flow. The numerical results agree well with the experimental observations, which indicates that the LES method can make good predictions of the unsteady cavitating flows around a rotor blade. The LES verification and validation (LES V&V) analysis was used to reveal the influence of cavitation on the flow structures. It can be found that the LES errors in cavitating region are larger than those in the non-cavitating area, which is mainly caused by more complicated cavitating and tip clearance flow structures. Further analysis of the interaction between the cavitating and vortex flow by the relative vorticity transport equation shows that the stretching, dilatation and baroclinic torque terms have major effects on the generation and transport of vortex structure. Meanwhile the Coriolis force term and viscosity term also exacerbate the vorticity transport in the cavitating region. In addition, the flow loss characteristics of this pump are also revealed by the entropy production theory. It is indicated that the tip clearance flow and trailing edge wake flow cause the viscous dissipation and turbulent dissipation, and the cavitation can further enhance the instability of the flow field in the tip clearance.Chengzao HanYun LongMohan XuBin JiMDPI AGarticlecavitationlarge eddy simulation (LES)verification and validation (V&V)vorticity transport equationentropy productionwaterjet pumpTechnologyTENEnergies, Vol 14, Iss 7635, p 7635 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	cavitation large eddy simulation (LES) verification and validation (V&V) vorticity transport equation entropy production waterjet pump Technology T
spellingShingle	cavitation large eddy simulation (LES) verification and validation (V&V) vorticity transport equation entropy production waterjet pump Technology T Chengzao Han Yun Long Mohan Xu Bin Ji Verification and Validation of Large Eddy Simulation for Tip Clearance Vortex Cavitating Flow in a Waterjet Pump
description	In this paper, large eddy simulation (LES) was adopted to simulate the cavitating flow in a waterjet pump with emphasis on the tip clearance flow. The numerical results agree well with the experimental observations, which indicates that the LES method can make good predictions of the unsteady cavitating flows around a rotor blade. The LES verification and validation (LES V&V) analysis was used to reveal the influence of cavitation on the flow structures. It can be found that the LES errors in cavitating region are larger than those in the non-cavitating area, which is mainly caused by more complicated cavitating and tip clearance flow structures. Further analysis of the interaction between the cavitating and vortex flow by the relative vorticity transport equation shows that the stretching, dilatation and baroclinic torque terms have major effects on the generation and transport of vortex structure. Meanwhile the Coriolis force term and viscosity term also exacerbate the vorticity transport in the cavitating region. In addition, the flow loss characteristics of this pump are also revealed by the entropy production theory. It is indicated that the tip clearance flow and trailing edge wake flow cause the viscous dissipation and turbulent dissipation, and the cavitation can further enhance the instability of the flow field in the tip clearance.
format	article
author	Chengzao Han Yun Long Mohan Xu Bin Ji
author_facet	Chengzao Han Yun Long Mohan Xu Bin Ji
author_sort	Chengzao Han
title	Verification and Validation of Large Eddy Simulation for Tip Clearance Vortex Cavitating Flow in a Waterjet Pump
title_short	Verification and Validation of Large Eddy Simulation for Tip Clearance Vortex Cavitating Flow in a Waterjet Pump
title_full	Verification and Validation of Large Eddy Simulation for Tip Clearance Vortex Cavitating Flow in a Waterjet Pump
title_fullStr	Verification and Validation of Large Eddy Simulation for Tip Clearance Vortex Cavitating Flow in a Waterjet Pump
title_full_unstemmed	Verification and Validation of Large Eddy Simulation for Tip Clearance Vortex Cavitating Flow in a Waterjet Pump
title_sort	verification and validation of large eddy simulation for tip clearance vortex cavitating flow in a waterjet pump
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/faec8b2f482d4eee8c45c6465d42f85b
work_keys_str_mv	AT chengzaohan verificationandvalidationoflargeeddysimulationfortipclearancevortexcavitatingflowinawaterjetpump AT yunlong verificationandvalidationoflargeeddysimulationfortipclearancevortexcavitatingflowinawaterjetpump AT mohanxu verificationandvalidationoflargeeddysimulationfortipclearancevortexcavitatingflowinawaterjetpump AT binji verificationandvalidationoflargeeddysimulationfortipclearancevortexcavitatingflowinawaterjetpump
_version_	1718412386130460672

Verification and Validation of Large Eddy Simulation for Tip Clearance Vortex Cavitating Flow in a Waterjet Pump

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