Mixing of stratified flow around bridge piers in steady current

Bjarne Jensen, Stefan Carstensen, Erik Damgaard Christensen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

216 Downloads (Pure)

Abstract

This paper presents the results of an experimental and numerical investigation of the mixing of stratified flow around bridge pier structures. In this study, which was carried out in connection with the Fehmarnbelt Fixed Link environmental impact assessment, the mixing processes of two-layer stratification was studied in which the lower level had a higher salinity than the upper layer. The physical experiments investigated two different pier designs. A general study was made regarding forces on the piers in which the effect of the current angle relative to the structure was also included. This was done in uniform flow with no stratification. Following this, a study was performed in which the mixing efficiency was investigated in the case of a stratified flow. The numerical investigations supplemented the findings of the physical experiments and gave information on scale effects, drag coefficients for low velocities, and natural background mixing. The present study provided a general understanding and knowledge about the mixing processes around bridge piers as well as a direct measure of the impact of the proposed designs on the natural stratification.
Original languageEnglish
Article number04018041
JournalJournal of Hydraulic Engineering
Volume144
Issue number8
Number of pages13
ISSN0733-9429
DOIs
Publication statusPublished - 2018

Keywords

  • Marine structures
  • Mixing
  • Model scale experiments
  • Navier-Stokes equations
  • Stratified flow
  • Turbulence modeling

Cite this

@article{08cbfc508e1744269bd9c43a73ee8bf2,
title = "Mixing of stratified flow around bridge piers in steady current",
abstract = "This paper presents the results of an experimental and numerical investigation of the mixing of stratified flow around bridge pier structures. In this study, which was carried out in connection with the Fehmarnbelt Fixed Link environmental impact assessment, the mixing processes of two-layer stratification was studied in which the lower level had a higher salinity than the upper layer. The physical experiments investigated two different pier designs. A general study was made regarding forces on the piers in which the effect of the current angle relative to the structure was also included. This was done in uniform flow with no stratification. Following this, a study was performed in which the mixing efficiency was investigated in the case of a stratified flow. The numerical investigations supplemented the findings of the physical experiments and gave information on scale effects, drag coefficients for low velocities, and natural background mixing. The present study provided a general understanding and knowledge about the mixing processes around bridge piers as well as a direct measure of the impact of the proposed designs on the natural stratification.",
keywords = "Marine structures, Mixing, Model scale experiments, Navier-Stokes equations, Stratified flow, Turbulence modeling",
author = "Bjarne Jensen and Stefan Carstensen and Christensen, {Erik Damgaard}",
year = "2018",
doi = "10.1061/(ASCE)HY.1943-7900.0001481",
language = "English",
volume = "144",
journal = "Journal of Hydraulic Engineering (Reston)",
issn = "0733-9429",
publisher = "American Society of Civil Engineers",
number = "8",

}

Mixing of stratified flow around bridge piers in steady current. / Jensen, Bjarne; Carstensen, Stefan; Christensen, Erik Damgaard.

In: Journal of Hydraulic Engineering, Vol. 144, No. 8, 04018041, 2018.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Mixing of stratified flow around bridge piers in steady current

AU - Jensen, Bjarne

AU - Carstensen, Stefan

AU - Christensen, Erik Damgaard

PY - 2018

Y1 - 2018

N2 - This paper presents the results of an experimental and numerical investigation of the mixing of stratified flow around bridge pier structures. In this study, which was carried out in connection with the Fehmarnbelt Fixed Link environmental impact assessment, the mixing processes of two-layer stratification was studied in which the lower level had a higher salinity than the upper layer. The physical experiments investigated two different pier designs. A general study was made regarding forces on the piers in which the effect of the current angle relative to the structure was also included. This was done in uniform flow with no stratification. Following this, a study was performed in which the mixing efficiency was investigated in the case of a stratified flow. The numerical investigations supplemented the findings of the physical experiments and gave information on scale effects, drag coefficients for low velocities, and natural background mixing. The present study provided a general understanding and knowledge about the mixing processes around bridge piers as well as a direct measure of the impact of the proposed designs on the natural stratification.

AB - This paper presents the results of an experimental and numerical investigation of the mixing of stratified flow around bridge pier structures. In this study, which was carried out in connection with the Fehmarnbelt Fixed Link environmental impact assessment, the mixing processes of two-layer stratification was studied in which the lower level had a higher salinity than the upper layer. The physical experiments investigated two different pier designs. A general study was made regarding forces on the piers in which the effect of the current angle relative to the structure was also included. This was done in uniform flow with no stratification. Following this, a study was performed in which the mixing efficiency was investigated in the case of a stratified flow. The numerical investigations supplemented the findings of the physical experiments and gave information on scale effects, drag coefficients for low velocities, and natural background mixing. The present study provided a general understanding and knowledge about the mixing processes around bridge piers as well as a direct measure of the impact of the proposed designs on the natural stratification.

KW - Marine structures

KW - Mixing

KW - Model scale experiments

KW - Navier-Stokes equations

KW - Stratified flow

KW - Turbulence modeling

U2 - 10.1061/(ASCE)HY.1943-7900.0001481

DO - 10.1061/(ASCE)HY.1943-7900.0001481

M3 - Journal article

VL - 144

JO - Journal of Hydraulic Engineering (Reston)

JF - Journal of Hydraulic Engineering (Reston)

SN - 0733-9429

IS - 8

M1 - 04018041

ER -