Turbulent Flow over Confined Backward-Facing Step: PIV vs. DNS

Particle Image Velocimetry measurements of the liquid velocity fields in the flow over the backward-facing step were performed in the same flow configuration as in the existing Direct Numerical Simulation (DNS). The experiment and the simulation were performed in an identical cross-section geometry...

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Autores principales:	Boštjan Zajec, Marko Matkovič, Nejc Kosanič, Jure Oder, Blaž Mikuž, Jan Kren, Iztok Tiselj
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	flow separation direct numerical simulation particle image velocimetry uncertainty Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/1cfa1afdcf634905b296f1c4893b832c
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id	oai:doaj.org-article:1cfa1afdcf634905b296f1c4893b832c
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spelling	oai:doaj.org-article:1cfa1afdcf634905b296f1c4893b832c2021-11-25T16:32:02ZTurbulent Flow over Confined Backward-Facing Step: PIV vs. DNS10.3390/app1122105822076-3417https://doaj.org/article/1cfa1afdcf634905b296f1c4893b832c2021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/22/10582https://doaj.org/toc/2076-3417Particle Image Velocimetry measurements of the liquid velocity fields in the flow over the backward-facing step were performed in the same flow configuration as in the existing Direct Numerical Simulation (DNS). The experiment and the simulation were performed in an identical cross-section geometry with step expansion rate 2.25 and the square shape of the outlet duct at the Reynolds number in an inlet part of the section 7100. The experiment was performed in transparent test section, 1.2 m long, with 20 × 45 mm<sup>2</sup> cross-section upstream and 45 × 45 mm<sup>2</sup> downstream, while a domain that was three times shorter was used in the DNS. A 2D-2C PIV system with a single high-speed camera and a pulse laser was used for a series of two-dimensional measurements of the velocity field at several cross-sections from two different perspectives. Variables analyzed in the experiment are time-averaged fluid velocities, velocity RMS fluctuations and two components of the Reynolds stress tensor. The key novelty is the comparison of two very accurate approaches, PIV and DNS, in the same cross-section geometry. Comparison of the similarities, and especially the differences between the two approaches, elucidates uncertainties of both studies and answers the question on what kind of agreement is expected when two very accurate approaches are compared.Boštjan ZajecMarko MatkovičNejc KosaničJure OderBlaž MikužJan KrenIztok TiseljMDPI AGarticleflow separationdirect numerical simulationparticle image velocimetryuncertaintyTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10582, p 10582 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	flow separation direct numerical simulation particle image velocimetry uncertainty Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	flow separation direct numerical simulation particle image velocimetry uncertainty Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Boštjan Zajec Marko Matkovič Nejc Kosanič Jure Oder Blaž Mikuž Jan Kren Iztok Tiselj Turbulent Flow over Confined Backward-Facing Step: PIV vs. DNS
description	Particle Image Velocimetry measurements of the liquid velocity fields in the flow over the backward-facing step were performed in the same flow configuration as in the existing Direct Numerical Simulation (DNS). The experiment and the simulation were performed in an identical cross-section geometry with step expansion rate 2.25 and the square shape of the outlet duct at the Reynolds number in an inlet part of the section 7100. The experiment was performed in transparent test section, 1.2 m long, with 20 × 45 mm<sup>2</sup> cross-section upstream and 45 × 45 mm<sup>2</sup> downstream, while a domain that was three times shorter was used in the DNS. A 2D-2C PIV system with a single high-speed camera and a pulse laser was used for a series of two-dimensional measurements of the velocity field at several cross-sections from two different perspectives. Variables analyzed in the experiment are time-averaged fluid velocities, velocity RMS fluctuations and two components of the Reynolds stress tensor. The key novelty is the comparison of two very accurate approaches, PIV and DNS, in the same cross-section geometry. Comparison of the similarities, and especially the differences between the two approaches, elucidates uncertainties of both studies and answers the question on what kind of agreement is expected when two very accurate approaches are compared.
format	article
author	Boštjan Zajec Marko Matkovič Nejc Kosanič Jure Oder Blaž Mikuž Jan Kren Iztok Tiselj
author_facet	Boštjan Zajec Marko Matkovič Nejc Kosanič Jure Oder Blaž Mikuž Jan Kren Iztok Tiselj
author_sort	Boštjan Zajec
title	Turbulent Flow over Confined Backward-Facing Step: PIV vs. DNS
title_short	Turbulent Flow over Confined Backward-Facing Step: PIV vs. DNS
title_full	Turbulent Flow over Confined Backward-Facing Step: PIV vs. DNS
title_fullStr	Turbulent Flow over Confined Backward-Facing Step: PIV vs. DNS
title_full_unstemmed	Turbulent Flow over Confined Backward-Facing Step: PIV vs. DNS
title_sort	turbulent flow over confined backward-facing step: piv vs. dns
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/1cfa1afdcf634905b296f1c4893b832c
work_keys_str_mv	AT bostjanzajec turbulentflowoverconfinedbackwardfacingsteppivvsdns AT markomatkovic turbulentflowoverconfinedbackwardfacingsteppivvsdns AT nejckosanic turbulentflowoverconfinedbackwardfacingsteppivvsdns AT jureoder turbulentflowoverconfinedbackwardfacingsteppivvsdns AT blazmikuz turbulentflowoverconfinedbackwardfacingsteppivvsdns AT jankren turbulentflowoverconfinedbackwardfacingsteppivvsdns AT iztoktiselj turbulentflowoverconfinedbackwardfacingsteppivvsdns
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Turbulent Flow over Confined Backward-Facing Step: PIV vs. DNS

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