DNS of buoyancy-dominated turbulent flows on a bluff body using the immersed boundary method

  • Authors:

  • Seongwon Kang;Gianluca Iaccarino;Frank Ham

  • Affiliations:

  • Center for Turbulence Research, Stanford University, 488 Escondido Mall, Building 500, Room 501N3, Stanford, CA 94305, USA;Center for Turbulence Research, Stanford University, 488 Escondido Mall, Building 500, Room 501N3, Stanford, CA 94305, USA;Center for Turbulence Research, Stanford University, 488 Escondido Mall, Building 500, Room 501N3, Stanford, CA 94305, USA

  • Venue:
  • Journal of Computational Physics
  • Year:
  • 2009

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Abstract

A novel immersed boundary (IB) method has been developed for simulating multi-material heat transfer problem - a cylinder in a channel heated from below with mixed convection. The method is based on a second-order velocity/scalar reconstruction near the IB. A novel algorithm has been developed for the IB method to handle conjugate heat transfer. The fluid-solid interface is constructed as a collection of disjoint faces of control volumes associated to different material zones. Coupling conditions for the material zones have been developed such that continuity and conservation of the scalar flux are satisfied by a second-order interpolation. Predictions of the local Nusselt number on the cylinder surface show good agreement with the experimental data. The effect of the Boussinesq approximation on this problem was also investigated. Comparison with the variable density formulation suggests that, in spite of a small thermal expansion coefficient of water, the variable density formulation in a transitional flow with mixed convection is preferable.