Turbulence organization in isolated roughness flow

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23210%2F23%3A43972434" target="_blank" >RIV/49777513:23210/23:43972434 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.matec-conferences.org/articles/matecconf/abs/2023/10/matecconf_pse23_00024/matecconf_pse23_00024.html" target="_blank" >https://www.matec-conferences.org/articles/matecconf/abs/2023/10/matecconf_pse23_00024/matecconf_pse23_00024.html</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/matecconf/202338300024" target="_blank" >10.1051/matecconf/202338300024</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Turbulence organization in isolated roughness flow

Popis výsledku v původním jazyce

The primary goal of this investigation was to analyze the specific evolution of the boundary layer over an isolated roughness. A specific surface consisting of rectangular elements of the same height arranged in a checkerboard pattern was used for the experiments. Throughout the experiment, the measuring cross-sections were positioned at various distances from the inlet, while maintaining a constant flow velocity of 15 m·s-1. To investigate the boundary layer topology in the streamwise directions, a 55P14 miniature hot-wire probe was employed. It is worth mentioning that the measuring position was situated at the midpoint between the roughness elements. Through the analysis of the gathered data, we identified the distribution patterns of the mean velocity profile at different measuring positions. Additionally, we estimated the integral scale of the turbulence by applying different approaches, such as the zero-crossing method (based on autocorrelation analysis), and the Roach and Karman methods (based on spectral density function). The data obtained from our experiments demonstrate that the presence of isolated roughness leads to a pronounced alteration of the velocity profile. This phenomenon is likely due to the shear layer, which typically contains the largest and most energetic vortices in the flow.

Název v anglickém jazyce

Turbulence organization in isolated roughness flow

Popis výsledku anglicky

The primary goal of this investigation was to analyze the specific evolution of the boundary layer over an isolated roughness. A specific surface consisting of rectangular elements of the same height arranged in a checkerboard pattern was used for the experiments. Throughout the experiment, the measuring cross-sections were positioned at various distances from the inlet, while maintaining a constant flow velocity of 15 m·s-1. To investigate the boundary layer topology in the streamwise directions, a 55P14 miniature hot-wire probe was employed. It is worth mentioning that the measuring position was situated at the midpoint between the roughness elements. Through the analysis of the gathered data, we identified the distribution patterns of the mean velocity profile at different measuring positions. Additionally, we estimated the integral scale of the turbulence by applying different approaches, such as the zero-crossing method (based on autocorrelation analysis), and the Roach and Karman methods (based on spectral density function). The data obtained from our experiments demonstrate that the presence of isolated roughness leads to a pronounced alteration of the velocity profile. This phenomenon is likely due to the shear layer, which typically contains the largest and most energetic vortices in the flow.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2023

Kód důvěrnosti údajů

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

Název statě ve sborníku

MATEC Web of Conferences

ISBN

—

ISSN

2261-236X

e-ISSN

2261-236X

Počet stran výsledku

9

Strana od-do

—

Název nakladatele

MATEC Web of Conferences

Místo vydání

Plzeň

Místo konání akce

Plzeň

Datum konání akce

15. 6. 2023

Typ akce podle státní příslušnosti

EUR - Evropská akce

Kód UT WoS článku

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