Publication:
Direct numerical simulation of two-dimensional stratified gravity current flow with varying stratification and aspect ratio

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dc.contributor.authorLam W.K.en_US
dc.contributor.authorChan L.en_US
dc.contributor.authorHasini H.en_US
dc.contributor.authorOoi A.en_US
dc.contributor.authorid57205240468en_US
dc.contributor.authorid57139456500en_US
dc.contributor.authorid6507435998en_US
dc.contributor.authorid7005905452en_US
dc.date.accessioned2023-05-29T06:53:19Z
dc.date.available2023-05-29T06:53:19Z
dc.date.issued2018
dc.descriptionDirect numerical simulation; Fluid mechanics; Gravitation; Gravity waves; Numerical models; Reynolds number; Vortex flow; Critical regimes; Gravity currents; Kelvin-Helmholtz; Size and shape; Strong stratification; Subcritical flow; Supercritical flow; Weak stratification; Aspect ratioen_US
dc.description.abstractDirect numerical simulations (DNSs) of two-dimensional stratified gravity current are carried out using OpenFOAM. Three different aspect ratios, h0/l0 (where h0 is the height of the dense fluid and l0 is the length of the dense fluid) are simulated with stratification strength, S=0.2, 0.5, and 0.8. Reynolds number is kept constant at Re=4000. For the equivalent h0/l0 ratio, the stratification strength reduces the front velocity, uf and results in a shorter front location, xf-l0. Stratification strength has a strong effect on the size and shape of the gravity current. Gravity current with aspect ratio, h0/l0 of 0.25 propagating in the stratified ambient of S=0.2 and 0.5 experienced two acceleration phases. Qualitiative analysis of contours ranging from subcritical to supercritical flow in comparison to the flow structures was presented in this study. Subcritical flow was smooth and minimal vortices formed in the head of the gravity current was obtained in all the cases with strong stratification strength, S=0.8. Supercritical flow occurs in weak stratification with h0/l0=1 and 4. Strong vortices formed in the head of the gravity current followed by Kelvin-Helmholtz (K-H) billows at the back of the head. The propagation of the internal waves was faster than the gravity current flow in the subcritical regime. Case h0/l0=4 with S=0.5 had the Froude number closest to the critical regime (Fr=0.324 ? 1/?) and can be deemed to be in the critical regime. � 2018 Australasian Fluid Mechanics Society. All rights reserved.en_US
dc.description.natureFinalen_US
dc.identifier.scopus2-s2.0-85084096977
dc.identifier.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85084096977&partnerID=40&md5=03e1705d65a505e05b047afd60ce9eb9
dc.identifier.urihttps://irepository.uniten.edu.my/handle/123456789/23940
dc.publisherAustralasian Fluid Mechanics Societyen_US
dc.sourceScopus
dc.sourcetitleProceedings of the 21st Australasian Fluid Mechanics Conference, AFMC 2018
dc.titleDirect numerical simulation of two-dimensional stratified gravity current flow with varying stratification and aspect ratioen_US
dc.typeConference Paperen_US
dspace.entity.typePublication
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