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Hydrodynamic Loading And Vortex Formation On Inundated Masonry Bridge Models / KGOTLA MAAKWE

Swansea University Author: KGOTLA MAAKWE

DOI (Published version): 10.23889/SUThesis.71068

Abstract

This thesis presents a comprehensive investigation of hydrodynamic loading and vortex dynamics in inundated masonry bridges , combining experimental studies, analytical modeling, and numerical simulations . The research focuses on elucidating pressure variations, vortex shedding mechanisms, and vort...

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Published: Swansea 2025
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
Supervisor: Reeve, D. E.
URI: https://cronfa.swan.ac.uk/Record/cronfa71068
first_indexed 2025-12-03T15:47:33Z
last_indexed 2025-12-05T09:33:49Z
id cronfa71068
recordtype RisThesis
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spelling 2025-12-03T15:51:37.3718902 v2 71068 2025-12-03 Hydrodynamic Loading And Vortex Formation On Inundated Masonry Bridge Models 89fe1c22a9ab05341d06e2f07f3d05ac KGOTLA MAAKWE KGOTLA MAAKWE true false 2025-12-03 This thesis presents a comprehensive investigation of hydrodynamic loading and vortex dynamics in inundated masonry bridges , combining experimental studies, analytical modeling, and numerical simulations . The research focuses on elucidating pressure variations, vortex shedding mechanisms, and vortex induced vibrations (VIV) in order to advance the understanding of fluid-structure interactions and enhance the resilience of bridge structures under open channel flow. Experimental investigations employed state-of-the-art instrumentation, including pressure sensors and accelerometers , to capture pressure distributions and structural vibrations under varying flow regimes. Hammer testing was used to identify natural frequencies , while dye injection and flow visualization revealed complex vortex shedding patterns. Analytical modeling through finite element analysis (FEA) in ANSYS provided structural mode shapes and natural frequencies , validated against experimental results . Complementary computational fluid dynamics ( CFD) simulations with REEF3D further examined velocity fields , turbulence structures, and pressure dynamics , with validation confirming errors generally below 10 to 13%.The main findings indicate that Bridge Model A remains relatively stable at lower flow rates, with improved damping at higher flows, while Bridge Model B exhibits distinct resonant frequencies, negative damping, and heightened susceptibility to VIV across conditions. Frequency response analysis and damping ratio evaluations confirmed anisotropic vibrational behavior, primarily within the X-Y plane. Correlation analyses of pressure, velocity, vorticity, and turbulent kinetic energy beneath the arch barrel revealed stronger velocity-pressure and velocity-vorticity interactions in Bridge Model A, reflecting localized acceleration and coherent vortex structures, whereas Bridge Model B displayed weaker correlations associated with distributed turbulence and wake stabilization. Collectively, these insights underscore the importance of robust energy dissipation mechanisms , tailored design modifications , and accurate numerical modeling to mitigate flow-induced instabilities and ensure long-term structural safety. E-Thesis Swansea Vortex-induced vibrations, masonry bridges, REEF3D 19 10 2025 2025-10-19 10.23889/SUThesis.71068 COLLEGE NANME COLLEGE CODE Swansea University Reeve, D. E. Doctoral Ph.D Botswana Government Botswana Government 2025-12-03T15:51:37.3718902 2025-12-03T15:33:57.6971233 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering KGOTLA MAAKWE 1 71068__35744__2227dfae8dd749d0b114f73682f28307.pdf 2025_Maakwe_K.final.71068.pdf 2025-12-03T15:45:55.2700071 Output 134266696 application/pdf E-Thesis – open access true Copyright: the author, Kgotla Martin Maakwe, 2025 true eng
title Hydrodynamic Loading And Vortex Formation On Inundated Masonry Bridge Models
spellingShingle Hydrodynamic Loading And Vortex Formation On Inundated Masonry Bridge Models
KGOTLA MAAKWE
title_short Hydrodynamic Loading And Vortex Formation On Inundated Masonry Bridge Models
title_full Hydrodynamic Loading And Vortex Formation On Inundated Masonry Bridge Models
title_fullStr Hydrodynamic Loading And Vortex Formation On Inundated Masonry Bridge Models
title_full_unstemmed Hydrodynamic Loading And Vortex Formation On Inundated Masonry Bridge Models
title_sort Hydrodynamic Loading And Vortex Formation On Inundated Masonry Bridge Models
author_id_str_mv 89fe1c22a9ab05341d06e2f07f3d05ac
author_id_fullname_str_mv 89fe1c22a9ab05341d06e2f07f3d05ac_***_KGOTLA MAAKWE
author KGOTLA MAAKWE
author2 KGOTLA MAAKWE
format E-Thesis
publishDate 2025
institution Swansea University
doi_str_mv 10.23889/SUThesis.71068
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering
document_store_str 1
active_str 0
description This thesis presents a comprehensive investigation of hydrodynamic loading and vortex dynamics in inundated masonry bridges , combining experimental studies, analytical modeling, and numerical simulations . The research focuses on elucidating pressure variations, vortex shedding mechanisms, and vortex induced vibrations (VIV) in order to advance the understanding of fluid-structure interactions and enhance the resilience of bridge structures under open channel flow. Experimental investigations employed state-of-the-art instrumentation, including pressure sensors and accelerometers , to capture pressure distributions and structural vibrations under varying flow regimes. Hammer testing was used to identify natural frequencies , while dye injection and flow visualization revealed complex vortex shedding patterns. Analytical modeling through finite element analysis (FEA) in ANSYS provided structural mode shapes and natural frequencies , validated against experimental results . Complementary computational fluid dynamics ( CFD) simulations with REEF3D further examined velocity fields , turbulence structures, and pressure dynamics , with validation confirming errors generally below 10 to 13%.The main findings indicate that Bridge Model A remains relatively stable at lower flow rates, with improved damping at higher flows, while Bridge Model B exhibits distinct resonant frequencies, negative damping, and heightened susceptibility to VIV across conditions. Frequency response analysis and damping ratio evaluations confirmed anisotropic vibrational behavior, primarily within the X-Y plane. Correlation analyses of pressure, velocity, vorticity, and turbulent kinetic energy beneath the arch barrel revealed stronger velocity-pressure and velocity-vorticity interactions in Bridge Model A, reflecting localized acceleration and coherent vortex structures, whereas Bridge Model B displayed weaker correlations associated with distributed turbulence and wake stabilization. Collectively, these insights underscore the importance of robust energy dissipation mechanisms , tailored design modifications , and accurate numerical modeling to mitigate flow-induced instabilities and ensure long-term structural safety.
published_date 2025-10-19T05:32:13Z
_version_ 1851098119223115776
score 11.444473

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