DIRECT NUMERICAL SIMULATIONS OF TURBULENT FLOW THROUGH POROUS CHANNELS AND DUCTS etc15 Tracking Number 93Presentation: Session: Geophysical and astrophysical turbulence 1 Room: Room C Session start: 10:30 Thu 27 Aug 2015 Arghya Samanta arghyar@gmail.com Affifliation: KTH Mechanics Ricardo Vinuesa rvinuesa@hawk.iit.edu Affifliation: KTH Mechanics Iman Lashgari imanl@mech.kth.se Affifliation: KTH Mechanics Philipp Schlatter pschlatt@mech.kth.se Affifliation: KTH Mechanics Luca Brandt luca@mech.kth.se Affifliation: KTH Mechanics Topics: - Geophysical and astrophysical turbulence, - Turbulence in multiphase and non-Newtonian flows Abstract: Direct numerical simulations of the fully developed turbulent flow through a porous channel and duct are performed based on the spectral element code Nek5000. The volume-averaged Navier-Stokes (VANS) equations are implemented in order to describe the flow in the composite medium. The numerical simulations of the VANS equations are carried out at a constant value of the bulk Reynolds number when the porosity, or equivalently, the permeability of the medium varies successively. The mean and turbulent energy budgets are computed and the effect of porosity on the secondary flow in a duct is examined. |