{"id":{"repo_id":"qu-belfast","oai_identifier":"oai:pure.qub.ac.uk/portal:studenttheses/01008e46-c3ec-4eda-9ca5-2e8e789ff490"},"canonical_url":"https://search.dev.ndltd.org/etd/qu-belfast/oai:pure.qub.ac.uk/portal:studenttheses/01008e46-c3ec-4eda-9ca5-2e8e789ff490","repository":{"repo_id":"qu-belfast","name":"Queen's University Belfast","base_url":"https://pureadmin.qub.ac.uk/ws/oai"},"display":{"title":"Incompressible flow over a three-dimensional cavity","abstract":"This thesis investigates, by using a computational fluid dynamics (CFD) method, the physics of incompressible flow passing over a three-dimensional cavity on a solid surface. This study has been divided into two parts: 1) incompressible laminar flow passing over a three-dimensional cavity; and 2) incompressible laminar-to-turbulent transition over a three-dimensional cavity.
In the second part, a CFD code for the solution of the three-dimensional unsteady incompressible Navier-Stokes equations is developed. This is used to simulate incompressible laminar flow past a rectangular cavity. Typical result of simulation for varying Reynolds numbers, inflow condition and cavity geometry are presented.. Unsteady vorticial structures and shear-layer oscillations are observed within and around
the cavities, and the flow becomes highly unsteady at high Reynolds numbers.
The third part examines the laminar- o-turbulent transition over three-dimensional cavities at high Reynolds numbers. This part itself includes two part: 1) simulation of the transitional flow and 2) prediction of the transitional areas in the shear layer of the cavity. A CFD code based on the large eddy simulation approach is developed for the simulation study. For the prediction of the areas of transition, a new:
spectral-entropy based method is proposed. The product of the spectral entropy and energy of the pressure fluctuation is used for predicting the location of transition in the shear-layer flow. Typical results of simulation of incompressible laminar flow past a rectangular cavity for a range of Reynolds numbers are presented. The results indicate that the transition to turbulence occurred in the shear layer at some
high Reynolds numbers ( e.g. R-e = 50, 000 100}000). The lambda structures and the “half mushroom” structures are observed in the transitional flows. The new method for predicting the transition is tested, and shows a good correlation with the results obtained based on large eddy simulation.
","abstract_html":"This thesis investigates, by using a computational fluid dynamics (CFD) method, the physics of incompressible flow passing over a three-dimensional cavity on a solid surface. This study has been divided into two parts: 1) incompressible laminar flow passing over a three-dimensional cavity; and 2) incompressible laminar-to-turbulent transition over a three-dimensional cavity.<br/><br/>In the second part, a CFD code for the solution of the three-dimensional unsteady incompressible Navier-Stokes equations is developed. This is used to simulate incompressible laminar flow past a rectangular cavity. Typical result of simulation for varying Reynolds numbers, inflow condition and cavity geometry are presented.. Unsteady vorticial structures and shear-layer oscillations are observed within and around<br/>the cavities, and the flow becomes highly unsteady at high Reynolds numbers.<br/><br/>The third part examines the laminar- o-turbulent transition over three-dimensional cavities at high Reynolds numbers. This part itself includes two part: 1) simulation of the transitional flow and 2) prediction of the transitional areas in the shear layer of the cavity. A CFD code based on the large eddy simulation approach is developed for the simulation study. For the prediction of the areas of transition, a new:<br/>spectral-entropy based method is proposed. The product of the spectral entropy and energy of the pressure fluctuation is used for predicting the location of transition in the shear-layer flow. Typical results of simulation of incompressible laminar flow past a rectangular cavity for a range of Reynolds numbers are presented. The results indicate that the transition to turbulence occurred in the shear layer at some<br/>high Reynolds numbers ( e.g. R-e = 50, 000 100}000). The lambda structures and the “half mushroom” structures are observed in the transitional flows. The new method for predicting the transition is tested, and shows a good correlation with the results obtained based on large eddy simulation.<br/>","abstract_has_math":false,"creators":["Yao, Hui"],"institution":"Queen's University Belfast","degree_name":"Doctor of Philosophy","degree_level":"Doctoral Thesis","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2003,"date_issued":"2003-7","date_published":"2003-7","updated_at":"2026-07-24T03:55:51Z","subjects":[],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["oai:pure.qub.ac.uk/portal:studenttheses/01008e46-c3ec-4eda-9ca5-2e8e789ff490"],"render_values":[{"text":"oai:pure.qub.ac.uk/portal:studenttheses/01008e46-c3ec-4eda-9ca5-2e8e789ff490","href":null,"code":true}]}]},"links":{"outbound_url":"https://pure.qub.ac.uk/en/studentTheses/01008e46-c3ec-4eda-9ca5-2e8e789ff490","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Yao, Hui"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2003-7"]},{"key":"dc:date.issued","label":"Date","values":["2003-7"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["School of Mechanical and Aerospace Engineering"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["Queen's University Belfast"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://pure.qub.ac.uk/en/studentTheses/01008e46-c3ec-4eda-9ca5-2e8e789ff490"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["Doctoral Thesis"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["Doctor of Philosophy"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["oai:pure.qub.ac.uk/portal:studenttheses/01008e46-c3ec-4eda-9ca5-2e8e789ff490","https://pure.qub.ac.uk/en/studentTheses/01008e46-c3ec-4eda-9ca5-2e8e789ff490"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://pure.qub.ac.uk/files/232228211/Incompressible_flow_over_a_three_dimensional_cavity.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This thesis investigates, by using a computational fluid dynamics (CFD) method, the physics of incompressible flow passing over a three-dimensional cavity on a solid surface. This study has been divided into two parts: 1) incompressible laminar flow passing over a three-dimensional cavity; and 2) incompressible laminar-to-turbulent transition over a three-dimensional cavity.
In the second part, a CFD code for the solution of the three-dimensional unsteady incompressible Navier-Stokes equations is developed. This is used to simulate incompressible laminar flow past a rectangular cavity. Typical result of simulation for varying Reynolds numbers, inflow condition and cavity geometry are presented.. Unsteady vorticial structures and shear-layer oscillations are observed within and around
the cavities, and the flow becomes highly unsteady at high Reynolds numbers.
The third part examines the laminar- o-turbulent transition over three-dimensional cavities at high Reynolds numbers. This part itself includes two part: 1) simulation of the transitional flow and 2) prediction of the transitional areas in the shear layer of the cavity. A CFD code based on the large eddy simulation approach is developed for the simulation study. For the prediction of the areas of transition, a new:
spectral-entropy based method is proposed. The product of the spectral entropy and energy of the pressure fluctuation is used for predicting the location of transition in the shear-layer flow. Typical results of simulation of incompressible laminar flow past a rectangular cavity for a range of Reynolds numbers are presented. The results indicate that the transition to turbulence occurred in the shear layer at some
high Reynolds numbers ( e.g. R-e = 50, 000 100}000). The lambda structures and the “half mushroom” structures are observed in the transitional flows. The new method for predicting the transition is tested, and shows a good correlation with the results obtained based on large eddy simulation.
"]},{"key":"dc:title","label":"Title","values":["Incompressible flow over a three-dimensional cavity"]}]}],"canonical_facts":{"dc:creator":["Yao, Hui"],"dc:date":["2003-7"],"dc:date.issued":["2003-7"],"dc:description.abstract":["This thesis investigates, by using a computational fluid dynamics (CFD) method, the physics of incompressible flow passing over a three-dimensional cavity on a solid surface. This study has been divided into two parts: 1) incompressible laminar flow passing over a three-dimensional cavity; and 2) incompressible laminar-to-turbulent transition over a three-dimensional cavity.
In the second part, a CFD code for the solution of the three-dimensional unsteady incompressible Navier-Stokes equations is developed. This is used to simulate incompressible laminar flow past a rectangular cavity. Typical result of simulation for varying Reynolds numbers, inflow condition and cavity geometry are presented.. Unsteady vorticial structures and shear-layer oscillations are observed within and around
the cavities, and the flow becomes highly unsteady at high Reynolds numbers.
The third part examines the laminar- o-turbulent transition over three-dimensional cavities at high Reynolds numbers. This part itself includes two part: 1) simulation of the transitional flow and 2) prediction of the transitional areas in the shear layer of the cavity. A CFD code based on the large eddy simulation approach is developed for the simulation study. For the prediction of the areas of transition, a new:
spectral-entropy based method is proposed. The product of the spectral entropy and energy of the pressure fluctuation is used for predicting the location of transition in the shear-layer flow. Typical results of simulation of incompressible laminar flow past a rectangular cavity for a range of Reynolds numbers are presented. The results indicate that the transition to turbulence occurred in the shear layer at some
high Reynolds numbers ( e.g. R-e = 50, 000 100}000). The lambda structures and the “half mushroom” structures are observed in the transitional flows. The new method for predicting the transition is tested, and shows a good correlation with the results obtained based on large eddy simulation.
"],"dc:identifier":["oai:pure.qub.ac.uk/portal:studenttheses/01008e46-c3ec-4eda-9ca5-2e8e789ff490","https://pure.qub.ac.uk/en/studentTheses/01008e46-c3ec-4eda-9ca5-2e8e789ff490"],"dc:identifier.uri":["https://pure.qub.ac.uk/files/232228211/Incompressible_flow_over_a_three_dimensional_cavity.pdf"],"dc:language":["eng"],"dc:publisher.department":["School of Mechanical and Aerospace Engineering"],"dc:publisher.institution":["Queen's University Belfast"],"dc:relation.isreferencedby":["https://pure.qub.ac.uk/en/studentTheses/01008e46-c3ec-4eda-9ca5-2e8e789ff490"],"dc:title":["Incompressible flow over a three-dimensional cavity"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["Doctoral Thesis"],"dc:type.qualificationname":["Doctor of Philosophy"]},"updated_at":"2026-07-24T03:55:51Z"}