eprintid: 10086833
rev_number: 19
eprint_status: archive
userid: 608
dir: disk0/10/08/68/33
datestamp: 2019-12-02 12:10:07
lastmod: 2021-09-26 23:11:20
status_changed: 2019-12-02 12:10:07
type: article
metadata_visibility: show
creators_name: Chua, KV
creators_name: Fraga, B
creators_name: Stoesser, T
creators_name: Hong, SH
creators_name: Sturm, T
title: Effect of Bridge Abutment Length on Turbulence Structure and Flow through the Opening
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F44
note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: The method of large eddy simulation (LES) was employed to investigate the flow and turbulence structure around bridge abutments of different lengths placed in a compound, asymmetric channel. The simulations were faithful representations of large-scale physical model experiments that were conducted in the hydraulics laboratory at the Georgia Institute of Technology. The experiments are considered idealized hydraulic models of the Towaliga River bridge at Macon, Georgia, consisting of flat horizontal floodplains on both sides of a parabolic main channel, two spill-through abutments with varying lengths [long-set back (LSB) and short-set back (SSB)], and a bridge spanning across the abutments. In the LES, a free flow scenario was simulated where the water surface was not perturbed by the bridge at any point. The Reynolds numbers, based on the bulk velocity and hydraulic radius, were 76,300 and 96,500 for LSB and SSB abutments, respectively. Validation of the simulation results using data from the complementary experiment is presented and agreement is found to be reasonably good. A thorough comparison of various flow variables between LSB and SSB scenarios to highlight the effect of flow contraction was carried out in terms of flow separation and instantaneous secondary flow, streamwise velocity, streamlines, stream traces, and turbulence structures. Further flow instability and vortex shedding generated in the shear layer downstream of the abutments were quantified by analyzing time series of the instantaneous velocity in the form of the probability density function, quadrant analysis, and power density spectra.
date: 2019-06
date_type: published
publisher: ASCE-AMER SOC CIVIL ENGINEERS
official_url: https://doi.org/10.1061/%28ASCE%29HY.1943-7900.0001591
oa_status: green
full_text_type: other
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 1650329
doi: 10.1061/(ASCE)HY.1943-7900.0001591
lyricists_name: Stoesser, Thorsten
lyricists_id: TSTOE28
actors_name: Flynn, Bernadette
actors_id: BFFLY94
actors_role: owner
full_text_status: public
publication: Journal of Hydraulic Engineering
volume: 145
number: 6
article_number: 04019024
pages: 19
citation:        Chua, KV;    Fraga, B;    Stoesser, T;    Hong, SH;    Sturm, T;      (2019)    Effect of Bridge Abutment Length on Turbulence Structure and Flow through the Opening.                   Journal of Hydraulic Engineering , 145  (6)    , Article 04019024.  10.1061/(ASCE)HY.1943-7900.0001591 <https://doi.org/10.1061/%28ASCE%29HY.1943-7900.0001591>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10086833/7/Stoesser_Effect%20of%20Bridge%20Abutment%20Length%20on%20Turbulence%20Structure%20and%20Flow%20through%20the%20Opening_AAM2.pdf