University of Canterbury Home
    • Admin
    UC Research Repository
    UC Library
    JavaScript is disabled for your browser. Some features of this site may not work without it.
    View Item 
    1. UC Home
    2. Library
    3. UC Research Repository
    4. Faculty of Engineering | Te Kaupeka Pūhanga
    5. Engineering: Journal Articles
    6. View Item
    1. UC Home
    2.  > 
    3. Library
    4.  > 
    5. UC Research Repository
    6.  > 
    7. Faculty of Engineering | Te Kaupeka Pūhanga
    8.  > 
    9. Engineering: Journal Articles
    10.  > 
    11. View Item

    Eliminating Boundary Layer Separation on a Cylinder with Non-Uniform Suction (2020)

    Thumbnail
    View/Open
    Accepted version (2.395Mb)
    Type of Content
    Journal Article
    UC Permalink
    https://hdl.handle.net/10092/101103
    
    Collections
    • Engineering: Journal Articles [1527]
    Authors
    Ramsay J
    Sellier M
    Ho WH
    show all
    Abstract

    Boundary layer separation negatively influences the performance of aerospace vehicles, for example, by triggering static stall or reducing combustion engine efficiency. Developing effective flow control to delay or eliminate separation is therefore of real use to the field. In this paper, numerical studies were carried out to optimise distributed suction profiles for preventing boundary layer separation on a circular cylinder in the fully laminar regime (Re < 188), with the least control effort. Relationships were found between the Reynolds number, the separation angle of the uncontrolled case, and the uniform suction needed to eliminate separation. It was found that for Re > 20, the uniform suction required to eliminate separation followed a quadratic profile, as a function of Re. Maximum uniform suction effort was needed at Re = 20, requiring a suction coefficient of CQ = 49:14 (as a percentage of the free-stream velocity) to eliminate separation. To resolve the best nonuniform suction profile at Re = 180, a variety of optimisation studies were performed using the coordinate search method. It was determined that the use of six control segments on each half of the cylinder provided the best control and efficient convergence to the optimal solution. 6- segment nonuniform suction eliminated separation at Re = 180 with net suction effort of CQ = 13:26 compared to CQ = 31:25 for the uniform case. These optimal suction profiles were compared using time-dependent simulations to confirm that both methods eliminate separation when introduced to an already unsteady case. Nonuniform suction eliminated separation faster, though uniform suction was more stable.

    Citation
    Ramsay J, Sellier M, Ho WH (2020). Eliminating Boundary Layer Separation on a Cylinder with Non-Uniform Suction. International Journal of Aerospace Engineering. In press.
    This citation is automatically generated and may be unreliable. Use as a guide only.
    ANZSRC Fields of Research
    40 - Engineering::4012 - Fluid mechanics and thermal engineering::401201 - Aerodynamics (excl. hypersonic aerodynamics)
    40 - Engineering::4012 - Fluid mechanics and thermal engineering::401204 - Computational methods in fluid flow, heat and mass transfer (incl. computational fluid dynamics)
    40 - Engineering::4001 - Aerospace engineering::400103 - Aircraft performance and flight control systems
    Rights
    All rights reserved unless otherwise stated
    http://hdl.handle.net/10092/17651

    Related items

    Showing items related by title, author, creator and subject.

    • Non-Uniform Suction Control of Flow around a Circular Cylinder 

      Ramsay JR; Sellier M; Ho WH (Elsevier BV, 2020)
      In the present study, numerical investigations were performed with optimisation to determine efficient non-uniform suction profiles to control the flow around a circular cylinder in the range of Reynolds numbers ...
    • On the Kutta condition in compressible flow over isolated airfoils 

      Mohebbi F; Evans B; Sellier M (MDPI AG, 2019)
      © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This paper presents a novel and accurate method to implement the Kutta condition in solving subsonic (subcritical) inviscid isentropic compressible flow over isolated ...
    • Optimum Control of Flow around a Circular Cylinder with Non-Uniform Suction 

      Ramsay JR; Sellier M; Ho WH (2019)
      In the present study, numerical investigations were performed to determine the optimum non-uniform suction profiles to control the flow around a circular cylinder in the range of Reynolds numbers 4<𝑅𝑒<200. To investigate ...
    Advanced Search

    Browse

    All of the RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThesis DisciplineThis CollectionBy Issue DateAuthorsTitlesSubjectsThesis Discipline

    Statistics

    View Usage Statistics
    • SUBMISSIONS
    • Research Outputs
    • UC Theses
    • CONTACTS
    • Send Feedback
    • +64 3 369 3853
    • ucresearchrepository@canterbury.ac.nz
    • ABOUT
    • UC Research Repository Guide
    • Copyright and Disclaimer
    • SUBMISSIONS
    • Research Outputs
    • UC Theses
    • CONTACTS
    • Send Feedback
    • +64 3 369 3853
    • ucresearchrepository@canterbury.ac.nz
    • ABOUT
    • UC Research Repository Guide
    • Copyright and Disclaimer