{"id":{"repo_id":"washington","oai_identifier":"oai:digital.lib.washington.edu:1773/33087"},"canonical_url":"https://search.dev.ndltd.org/etd/washington/oai:digital.lib.washington.edu:1773/33087","repository":{"repo_id":"washington","name":"University of Washington","base_url":"https://digital.lib.washington.edu/server/oai/request"},"display":{"title":"Implementation of 3DPTV for turbulence analysis and subgrid-scale stress model testing of a backward-facing step flow","abstract":"Large-Eddy Simulation (LES) is a constantly-expanding field with many new applications and models being introduced on a regular basis. The active nature of this field establishes the need for high-resolution, 3-dimensional experimental data for assessment and development of Subgrid-Scale (SGS) Models. An experimental technique well-suited to this application is Three-Dimensional Particle Tracking Velocimetry (3DPTV) utilizing the epipolar line triangulation method is an accepted method of quantifying volumes of 3-Dimension 3-Component (3D3C) velocity vector fields. This study adapted the epipolar line search triangulation methodology, as it was applied in micro-scale systems, to a backward-facing step flow in a small-scale water tunnel testing facility. The camera system, consisting of three 4008 $\\times$ 2672 CCDs, was aligned and calibrated using a custom grid and dot target plate mounted on a purpose-built rig, containing a precision single-axis translation stage. Dual-pulsed, Nd:YAG lasers at 532 nm, 120mJ/pulse, illuminated the $28\\text{ mm} \\times 18\\text{ mm} \\times 4.5\\text{ mm}$ volume of interest, located downstream of a $2.858\\text{ cm}$ step in a $15.24\\text{ cm} \\times 30.48\\text{ cm}$ cross-section water tunnel. The turbulent flow, u$_\\text{in}=$22cm/s, $Re_h=6274$, $R_\\lambda\\approx130$, and $ER=1.208$ was seeded with TiO$_2$ particles, $<$5$\\mu$m diameter, to maintain one-way coupling. The resulting 3DPTV system was shown to have uncertainty comparable to that of previous experimentation. Utilizing the acquired data, \\textit{a priori} testing of universally notable LES SGS Models, including the Smagorinsky, Similarity, Mixed, Coherent Structures, and Dynamic Models was accomplished and results are presented and discussed. This application of 3DPTV to a turbulent, backward-facing step flow and the results presented herein not only establish the technique as a promising source of experimental data in the development of LES, it lays a foundation for future study of the phenomena-rich backward-facing step flow and the testing and development of new LES SGS models.","abstract_html":"Large-Eddy Simulation (LES) is a constantly-expanding field with many new applications and models being introduced on a regular basis. The active nature of this field establishes the need for high-resolution, 3-dimensional experimental data for assessment and development of Subgrid-Scale (SGS) Models. An experimental technique well-suited to this application is Three-Dimensional Particle Tracking Velocimetry (3DPTV) utilizing the epipolar line triangulation method is an accepted method of quantifying volumes of 3-Dimension 3-Component (3D3C) velocity vector fields. This study adapted the epipolar line search triangulation methodology, as it was applied in micro-scale systems, to a backward-facing step flow in a small-scale water tunnel testing facility. The camera system, consisting of three 4008 $\\times$ 2672 CCDs, was aligned and calibrated using a custom grid and dot target plate mounted on a purpose-built rig, containing a precision single-axis translation stage. Dual-pulsed, Nd:YAG lasers at 532 nm, 120mJ/pulse, illuminated the $28\\text{ mm} \\times 18\\text{ mm} \\times 4.5\\text{ mm}$ volume of interest, located downstream of a $2.858\\text{ cm}$ step in a $15.24\\text{ cm} \\times 30.48\\text{ cm}$ cross-section water tunnel. The turbulent flow, u<span class=\"etd-inline-math\"><sub>\\</sub>text{in}=</span>22cm/s, <span class=\"etd-inline-math\">Re<sub>h</sub>=6274</span>, <span class=\"etd-inline-math\">R<sub>\\</sub>lambda\\approx130</span>, and $ER=1.208$ was seeded with TiO<span class=\"etd-inline-math\"><sub>2</sub></span> particles, $&lt;$5<span class=\"etd-inline-math\">&mu;</span>m diameter, to maintain one-way coupling. The resulting 3DPTV system was shown to have uncertainty comparable to that of previous experimentation. Utilizing the acquired data, \\textit{a priori} testing of universally notable LES SGS Models, including the Smagorinsky, Similarity, Mixed, Coherent Structures, and Dynamic Models was accomplished and results are presented and discussed. This application of 3DPTV to a turbulent, backward-facing step flow and the results presented herein not only establish the technique as a promising source of experimental data in the development of LES, it lays a foundation for future study of the phenomena-rich backward-facing step flow and the testing and development of new LES SGS models.","abstract_has_math":true,"creators":["Dona, Nicholas William"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Dabiri, Dana"],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-05-11","date_published":"2015-05-11","updated_at":"2026-07-24T05:58:23Z","subjects":["3DPTV; A Priori Testing; Backward-Facing Step Flow; LES; SGS Models; Turbulence Analysis"],"languages":["en_US"],"rights":["Copyright is held by the individual authors."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1773/33087","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Dabiri, Dana"]},{"key":"dc:creator","label":"Author","values":["Dona, Nicholas William"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2015-05-11T19:58:47Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2015-05-11T19:58:47Z"]},{"key":"dc:date.issued","label":"Date","values":["2015-05-11"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["3DPTV; A Priori Testing; Backward-Facing Step Flow; LES; SGS Models; Turbulence Analysis"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright is held by the individual authors."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["Dona_washington_0250O_14262.pdf"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1773/33087"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Thesis (Master's)--University of Washington, 2015"]},{"key":"dc:description.abstract","label":"Abstract","values":["Large-Eddy Simulation (LES) is a constantly-expanding field with many new applications and models being introduced on a regular basis. The active nature of this field establishes the need for high-resolution, 3-dimensional experimental data for assessment and development of Subgrid-Scale (SGS) Models. An experimental technique well-suited to this application is Three-Dimensional Particle Tracking Velocimetry (3DPTV) utilizing the epipolar line triangulation method is an accepted method of quantifying volumes of 3-Dimension 3-Component (3D3C) velocity vector fields. This study adapted the epipolar line search triangulation methodology, as it was applied in micro-scale systems, to a backward-facing step flow in a small-scale water tunnel testing facility. The camera system, consisting of three 4008 $\\times$ 2672 CCDs, was aligned and calibrated using a custom grid and dot target plate mounted on a purpose-built rig, containing a precision single-axis translation stage. Dual-pulsed, Nd:YAG lasers at 532 nm, 120mJ/pulse, illuminated the $28\\text{ mm} \\times 18\\text{ mm} \\times 4.5\\text{ mm}$ volume of interest, located downstream of a $2.858\\text{ cm}$ step in a $15.24\\text{ cm} \\times 30.48\\text{ cm}$ cross-section water tunnel. The turbulent flow, u$_\\text{in}=$22cm/s, $Re_h=6274$, $R_\\lambda\\approx130$, and $ER=1.208$ was seeded with TiO$_2$ particles, $<$5$\\mu$m diameter, to maintain one-way coupling. The resulting 3DPTV system was shown to have uncertainty comparable to that of previous experimentation. Utilizing the acquired data, \\textit{a priori} testing of universally notable LES SGS Models, including the Smagorinsky, Similarity, Mixed, Coherent Structures, and Dynamic Models was accomplished and results are presented and discussed. This application of 3DPTV to a turbulent, backward-facing step flow and the results presented herein not only establish the technique as a promising source of experimental data in the development of LES, it lays a foundation for future study of the phenomena-rich backward-facing step flow and the testing and development of new LES SGS models."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Implementation of 3DPTV for turbulence analysis and subgrid-scale stress model testing of a backward-facing step flow"]}]}],"canonical_facts":{"dc:contributor.advisor":["Dabiri, Dana"],"dc:creator":["Dona, Nicholas William"],"dc:date.accessioned":["2015-05-11T19:58:47Z"],"dc:date.available":["2015-05-11T19:58:47Z"],"dc:date.issued":["2015-05-11"],"dc:description":["Thesis (Master's)--University of Washington, 2015"],"dc:description.abstract":["Large-Eddy Simulation (LES) is a constantly-expanding field with many new applications and models being introduced on a regular basis. The active nature of this field establishes the need for high-resolution, 3-dimensional experimental data for assessment and development of Subgrid-Scale (SGS) Models. An experimental technique well-suited to this application is Three-Dimensional Particle Tracking Velocimetry (3DPTV) utilizing the epipolar line triangulation method is an accepted method of quantifying volumes of 3-Dimension 3-Component (3D3C) velocity vector fields. This study adapted the epipolar line search triangulation methodology, as it was applied in micro-scale systems, to a backward-facing step flow in a small-scale water tunnel testing facility. The camera system, consisting of three 4008 $\\times$ 2672 CCDs, was aligned and calibrated using a custom grid and dot target plate mounted on a purpose-built rig, containing a precision single-axis translation stage. Dual-pulsed, Nd:YAG lasers at 532 nm, 120mJ/pulse, illuminated the $28\\text{ mm} \\times 18\\text{ mm} \\times 4.5\\text{ mm}$ volume of interest, located downstream of a $2.858\\text{ cm}$ step in a $15.24\\text{ cm} \\times 30.48\\text{ cm}$ cross-section water tunnel. The turbulent flow, u$_\\text{in}=$22cm/s, $Re_h=6274$, $R_\\lambda\\approx130$, and $ER=1.208$ was seeded with TiO$_2$ particles, $<$5$\\mu$m diameter, to maintain one-way coupling. The resulting 3DPTV system was shown to have uncertainty comparable to that of previous experimentation. Utilizing the acquired data, \\textit{a priori} testing of universally notable LES SGS Models, including the Smagorinsky, Similarity, Mixed, Coherent Structures, and Dynamic Models was accomplished and results are presented and discussed. This application of 3DPTV to a turbulent, backward-facing step flow and the results presented herein not only establish the technique as a promising source of experimental data in the development of LES, it lays a foundation for future study of the phenomena-rich backward-facing step flow and the testing and development of new LES SGS models."],"dc:format.mimetype":["application/pdf"],"dc:identifier.other":["Dona_washington_0250O_14262.pdf"],"dc:identifier.uri":["http://hdl.handle.net/1773/33087"],"dc:language.iso":["en_US"],"dc:rights":["Copyright is held by the individual authors."],"dc:subject":["3DPTV; A Priori Testing; Backward-Facing Step Flow; LES; SGS Models; Turbulence Analysis"],"dc:title":["Implementation of 3DPTV for turbulence analysis and subgrid-scale stress model testing of a backward-facing step flow"],"dc:type":["Thesis"]},"updated_at":"2026-07-24T05:58:23Z"}