Unsteady multiphase simulation of oleo-pneumatic shock absorber flow

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dc.contributor.authorSheikh Al-Shabab, Ahmed A.
dc.contributor.authorGrenko, Bojan
dc.contributor.authorSilva, Paulo A. S. F.
dc.contributor.authorAntoniadis, Antonis F.
dc.contributor.authorTsoutsanis, Panagiotis
dc.contributor.authorSkote, Martin
dc.date.accessioned2024-03-21T12:40:21Z
dc.date.available2024-03-21T12:40:21Z
dc.date.issued2024-03-07
dc.description.abstractThe internal flow in oleo-pneumatic shock absorbers is a complex multiphysics problem combining the interaction between highly unsteady turbulent flow and multiphase mixing, among other effects. The aim is to present a validated simulation methodology that facilitates shock absorber performance prediction by capturing the dominant internal flow physics. This is achieved by simulating a drop test of approximately 1 tonne with an initial contact vertical speed of 2.7 m/s, corresponding to a light jet. The flow field solver is ANSYS Fluent, using an unsteady two-dimensional axisymmetric multiphase setup with a time-varying inlet velocity boundary condition corresponding to the stroke rate of the shock absorber piston. The stroke rate is calculated using a two-equation dynamic system model of the shock absorber under the applied loading. The simulation is validated against experimental measurements of the total force on the shock absorber during the stroke, in addition to standard physical checks. The flow field analysis focuses on multiphase mixing and its influence on the turbulent free shear layer and recirculating flow. A mixing index approach is suggested to facilitate systematically quantifying the mixing process and identifying the distinct stages of the interaction. It is found that gas–oil interaction has a significant impact on the flow development in the shock absorber’s upper chamber, where strong mixing leads to a periodic stream of small gas bubbles being fed into the jet’s shear layer from larger bubbles in recirculation zones, most notably in the corner between the orifice plate and outer shock absorber wall.en_UK
dc.description.sponsorshipThis research was funded by Innovate UK grant number 10002411, under the ATI/IUK Project: LANDOne, with Airbus UK as Industrial Lead.en_UK
dc.identifier.citationSheikh Al-Shabab AA, Grenko B, Silva PA, et al., (2024) Unsteady multiphase simulation of oleo-pneumatic shock absorber flow. Fluids, Volume 9, Issue 3, March 2024, Article Number 68en_UK
dc.identifier.eissn2311-5521
dc.identifier.urihttps://doi.org/10.3390/fluids9030068
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/21060
dc.language.isoen_UKen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectcomputational fluid dynamicsen_UK
dc.subjectmultiphysicsen_UK
dc.subjectturbulence modellingen_UK
dc.subjectshear layersen_UK
dc.subjectlanding gearen_UK
dc.titleUnsteady multiphase simulation of oleo-pneumatic shock absorber flowen_UK
dc.typeArticleen_UK
dcterms.dateAccepted2024-02-29

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