CFD study of flow over parallel ridges with varying height and spacing

Lee Chin Yik, Salim Mohamed Salim, Andrew Chan, Cheah Siew Cheong

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A CFD study is performed for a two-dimensional model to simulate and investigate the turbulent flow interactions between three parallel ridges. Velocity profiles and turbulent kinetic energies are presented to illustrate the effects of varying the ridge height and separation distance. The numerical results are validated against extensive atmospheric wind tunnel data obtained from USEPA. Studies on different mesh configurations and inbuilt Reynolds averaged Navier-Stokes (RANS) turbulence models shows that the standard k-ε model predicts the flow field most accurately in relation to the TKE. General flow patterns involve flow separation in the windward corners and recirculation behind each ridge. An amplification of the velocity and TKE are observed as the ridge height increases, whereas larger separations result in lower velocities and significant variation in downwind TKE values.
Original languageEnglish
Title of host publicationProceedings of the World Congress on Engineering 2010
Number of pages6
Publication statusPublished - 2010
EventWorld Congress on Engineering 2010 - London, United Kingdom
Duration: 30 Jun 20102 Jul 2010


ConferenceWorld Congress on Engineering 2010
Abbreviated titleWCE 2010
Country/TerritoryUnited Kingdom


  • CFD
  • Parallel ridges
  • Separation and recirculation
  • Turbulent kinetic energy
  • Atmospheric wind tunnel
  • Mesh configurations
  • Numerical results
  • Recirculations
  • Reynolds-Averaged Navier-Stokes
  • Separation distances
  • Two dimensional model
  • Velocity profiles
  • Kinetic energy
  • Navier Stokes equations
  • Parallel flow
  • Turbulence models
  • Turbulent flow
  • Computational fluid dynamics


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