Flow patterns and related vibrations around an inclined U-profile

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378297%3A_____%2F24%3A00587605" target="_blank" >RIV/68378297:_____/24:00587605 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.12989/was.2024.39.1.031" target="_blank" >https://doi.org/10.12989/was.2024.39.1.031</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.12989/was.2024.39.1.031" target="_blank" >10.12989/was.2024.39.1.031</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Flow patterns and related vibrations around an inclined U-profile

Popis výsledku v původním jazyce

This paper examines the flow characteristics around an inclined prism with a U-shaped cross-section (“U-profile”)nand investigates the connection between the flow and flow-induced vibrations. The study employs a combined approach thatinvolves wind tunnel experiments and computational fluid dynamics (CFD) using an unsteady Reynolds-averaged Navier-Stokes (RANS) turbulence model. Distinct vortex formation patterns are observed in the flow field surrounding the stationary inclined profile. When the cavity of the profile faces away from the incoming flow, large vortices develop behind the profile. Conversely, when the cavity is oriented towards the oncoming flow, these vortices form within the cavity. Notably, due to the slow movement of these large vortices through the cavity, the frequency at which vortices are shed in the negative inclination case is lower compared to the positive inclination, where they form in the wake. Wind tunnel experiments reveal an intermittent transition between the two vortex formation patterns at zero inclination. Large vortices sporadically emerge both in the cavity and behind the profile. The simulation results demonstrate that when these large vortices occur at a frequency close to the structure’s natural frequency, they induce prominent pitch vibrations. This phenomenon is also sought after and presented in coupled vibration experiments. Additionally, the simulations indicate that when the natural frequency of the structure is considerably lower than the vortex shedding frequency, this type of vibration can be observed.

Název v anglickém jazyce

Flow patterns and related vibrations around an inclined U-profile

Popis výsledku anglicky

This paper examines the flow characteristics around an inclined prism with a U-shaped cross-section (“U-profile”)nand investigates the connection between the flow and flow-induced vibrations. The study employs a combined approach thatinvolves wind tunnel experiments and computational fluid dynamics (CFD) using an unsteady Reynolds-averaged Navier-Stokes (RANS) turbulence model. Distinct vortex formation patterns are observed in the flow field surrounding the stationary inclined profile. When the cavity of the profile faces away from the incoming flow, large vortices develop behind the profile. Conversely, when the cavity is oriented towards the oncoming flow, these vortices form within the cavity. Notably, due to the slow movement of these large vortices through the cavity, the frequency at which vortices are shed in the negative inclination case is lower compared to the positive inclination, where they form in the wake. Wind tunnel experiments reveal an intermittent transition between the two vortex formation patterns at zero inclination. Large vortices sporadically emerge both in the cavity and behind the profile. The simulation results demonstrate that when these large vortices occur at a frequency close to the structure’s natural frequency, they induce prominent pitch vibrations. This phenomenon is also sought after and presented in coupled vibration experiments. Additionally, the simulations indicate that when the natural frequency of the structure is considerably lower than the vortex shedding frequency, this type of vibration can be observed.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Wind and Structures

ISSN

1226-6116

e-ISSN

1598-6225

Svazek periodika

39

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

KR - Korejská republika

Počet stran výsledku

15

Strana od-do

31-45

Kód UT WoS článku

001272391300003

EID výsledku v databázi Scopus

2-s2.0-85200129731