Simulation of laminar turbulent transition, methods for its control and drag reduction
The objectives of this project were to study the transition process of a laminar boundary layer to a turbulent one and develop methods for the manipulation of the laminar-turbulent transition process. Two methods to trigger the transition process were successfully used, namely the sinusoidal perturb...
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2011
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/45979 |
| _version_ | 1826120995511992320 |
|---|---|
| author | Kang, Kean Lee. |
| author2 | Jorg Uwe Schluter |
| author_facet | Jorg Uwe Schluter Kang, Kean Lee. |
| author_sort | Kang, Kean Lee. |
| collection | NTU |
| description | The objectives of this project were to study the transition process of a laminar boundary layer to a turbulent one and develop methods for the manipulation of the laminar-turbulent transition process. Two methods to trigger the transition process were successfully used, namely the sinusoidal perturbation body force, and by decelerating the flow near to the wall. The former was meant to simulate disturbances that occur naturally in the freestream flow of air. The latter simulates a man-made actuator (such as a plasma actuator) on the surface of a wall that can exert control on the transition process. Both methods mentioned above usually resulted in a bypass transition process. It was also found that transition to turbulent flow can be prevented by accelerating the near wall flow. The main result of this project, however, was from a series of simulations designed to investigate the interactions between all the variables under study. It was found that the actuator could effectively control the total skin friction drag along the wall under all flow conditions studied, including both turbulent and laminar flow. This indicates that the actuator is robust and is a promising candidate for further development in the field of drag reduction. To provide a level of confidence to the conclusions of these simulations, analysis of variances (ANOVA) was also carried out. |
| first_indexed | 2024-10-01T05:25:31Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/45979 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T05:25:31Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | ntu-10356/459792023-03-04T19:13:27Z Simulation of laminar turbulent transition, methods for its control and drag reduction Kang, Kean Lee. Jorg Uwe Schluter School of Mechanical and Aerospace Engineering DRNTU::Engineering::Aeronautical engineering::Aerodynamics The objectives of this project were to study the transition process of a laminar boundary layer to a turbulent one and develop methods for the manipulation of the laminar-turbulent transition process. Two methods to trigger the transition process were successfully used, namely the sinusoidal perturbation body force, and by decelerating the flow near to the wall. The former was meant to simulate disturbances that occur naturally in the freestream flow of air. The latter simulates a man-made actuator (such as a plasma actuator) on the surface of a wall that can exert control on the transition process. Both methods mentioned above usually resulted in a bypass transition process. It was also found that transition to turbulent flow can be prevented by accelerating the near wall flow. The main result of this project, however, was from a series of simulations designed to investigate the interactions between all the variables under study. It was found that the actuator could effectively control the total skin friction drag along the wall under all flow conditions studied, including both turbulent and laminar flow. This indicates that the actuator is robust and is a promising candidate for further development in the field of drag reduction. To provide a level of confidence to the conclusions of these simulations, analysis of variances (ANOVA) was also carried out. Bachelor of Engineering (Aerospace Engineering) 2011-06-27T04:25:29Z 2011-06-27T04:25:29Z 2011 2011 Final Year Project (FYP) http://hdl.handle.net/10356/45979 en Nanyang Technological University 108 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Aeronautical engineering::Aerodynamics Kang, Kean Lee. Simulation of laminar turbulent transition, methods for its control and drag reduction |
| title | Simulation of laminar turbulent transition, methods for its control and drag reduction |
| title_full | Simulation of laminar turbulent transition, methods for its control and drag reduction |
| title_fullStr | Simulation of laminar turbulent transition, methods for its control and drag reduction |
| title_full_unstemmed | Simulation of laminar turbulent transition, methods for its control and drag reduction |
| title_short | Simulation of laminar turbulent transition, methods for its control and drag reduction |
| title_sort | simulation of laminar turbulent transition methods for its control and drag reduction |
| topic | DRNTU::Engineering::Aeronautical engineering::Aerodynamics |
| url | http://hdl.handle.net/10356/45979 |
| work_keys_str_mv | AT kangkeanlee simulationoflaminarturbulenttransitionmethodsforitscontrolanddragreduction |