An analysis of two-dimensional stratified gravity current flow using open FOAM

Direct numerical simulations (DNSs) of two-dimensional stratified gravity-current are simulated using OpenFOAM. Three different aspect ratio, h 0 /l 0 (where h 0 is the height of the dense fluid and l 0 is the length of the dense fluid) are simulated with stratification ranging from 0 (homogenous am...

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Main Authors: Lam W.K., Chan L., Hasini H., Ooi A.
Other Authors: 57205240468
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Published: Science Publishing Corporation Inc 2023
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spelling my.uniten.dspace-240012023-05-29T14:54:07Z An analysis of two-dimensional stratified gravity current flow using open FOAM Lam W.K. Chan L. Hasini H. Ooi A. 57205240468 57139456500 6507435998 7005905452 Direct numerical simulations (DNSs) of two-dimensional stratified gravity-current are simulated using OpenFOAM. Three different aspect ratio, h 0 /l 0 (where h 0 is the height of the dense fluid and l 0 is the length of the dense fluid) are simulated with stratification ranging from 0 (homogenous ambient) to 0.2 with a constant Reynolds number (Re) of 4000. The stratification of the ambient air is determined by the density difference between the bottom and the top walls of the channel (? b - ? 0 , where ? b is the density at the bottom of the domain and ? 0 is the density at the top). The magnitude of the stratification (S=? b /?) can be determined by calculating the reduced density differences of the bottom fluid with the ambient fluid (? b = (? b - ? 0 )/ ? 0 ) and the dense fluid with the ambient fluid (? = (? c -? 0 )/ ? 0 , where ? c represents the density of the dense fluid). The configuration of the simulation is validated with a test case from Birman, Meiburg & Ungraish and the contour and front velocity (propagation speed) were in good agreement. The gravity current flow in the stratified ambient is analyzed qualitatively and compared with the gravity current in the homogenous ambient. Gravity current in homogenous ambient (S=0) and weak stratification (S=0.2) are supercritical flow where the flow is turbulent and Kelvin-Helmholtz (K-H) billow formed behind the gravity current head. The front location of the gravity is reduced as the stratification increase and denotes that the front velocity of the gravity current is reduced by the stratification. � 2018 Authors. Final 2023-05-29T06:54:07Z 2023-05-29T06:54:07Z 2018 Article 10.14419/ijet.v7i4.35.22919 2-s2.0-85059246476 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85059246476&doi=10.14419%2fijet.v7i4.35.22919&partnerID=40&md5=21382fe0a7da06a16da84c040ee710e0 https://irepository.uniten.edu.my/handle/123456789/24001 7 4 589 595 All Open Access, Green Science Publishing Corporation Inc Scopus
institution Universiti Tenaga Nasional
building UNITEN Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Tenaga Nasional
content_source UNITEN Institutional Repository
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description Direct numerical simulations (DNSs) of two-dimensional stratified gravity-current are simulated using OpenFOAM. Three different aspect ratio, h 0 /l 0 (where h 0 is the height of the dense fluid and l 0 is the length of the dense fluid) are simulated with stratification ranging from 0 (homogenous ambient) to 0.2 with a constant Reynolds number (Re) of 4000. The stratification of the ambient air is determined by the density difference between the bottom and the top walls of the channel (? b - ? 0 , where ? b is the density at the bottom of the domain and ? 0 is the density at the top). The magnitude of the stratification (S=? b /?) can be determined by calculating the reduced density differences of the bottom fluid with the ambient fluid (? b = (? b - ? 0 )/ ? 0 ) and the dense fluid with the ambient fluid (? = (? c -? 0 )/ ? 0 , where ? c represents the density of the dense fluid). The configuration of the simulation is validated with a test case from Birman, Meiburg & Ungraish and the contour and front velocity (propagation speed) were in good agreement. The gravity current flow in the stratified ambient is analyzed qualitatively and compared with the gravity current in the homogenous ambient. Gravity current in homogenous ambient (S=0) and weak stratification (S=0.2) are supercritical flow where the flow is turbulent and Kelvin-Helmholtz (K-H) billow formed behind the gravity current head. The front location of the gravity is reduced as the stratification increase and denotes that the front velocity of the gravity current is reduced by the stratification. � 2018 Authors.
author2 57205240468
author_facet 57205240468
Lam W.K.
Chan L.
Hasini H.
Ooi A.
format Article
author Lam W.K.
Chan L.
Hasini H.
Ooi A.
spellingShingle Lam W.K.
Chan L.
Hasini H.
Ooi A.
An analysis of two-dimensional stratified gravity current flow using open FOAM
author_sort Lam W.K.
title An analysis of two-dimensional stratified gravity current flow using open FOAM
title_short An analysis of two-dimensional stratified gravity current flow using open FOAM
title_full An analysis of two-dimensional stratified gravity current flow using open FOAM
title_fullStr An analysis of two-dimensional stratified gravity current flow using open FOAM
title_full_unstemmed An analysis of two-dimensional stratified gravity current flow using open FOAM
title_sort analysis of two-dimensional stratified gravity current flow using open foam
publisher Science Publishing Corporation Inc
publishDate 2023
_version_ 1806426485821538304
score 13.214268