1 Reply Latest reply on Mar 26, 2010 9:57 AM by Loic Ancian

    FLOW TRAJECTORIES IN TURBULENT FLOW

    Kirk Reis

      I am curious as to how useful the flow tracjectories are in describing the random and chaotic nature of turbulent flow.  Does flow simulation take mean locations over a period of time of particles?  Should this tool be avoided when dealing with turbulent flow?

       

      Thanks

        • Re: FLOW TRAJECTORIES IN TURBULENT FLOW
          Loic Ancian
          Most of the fluid flows we encounter in engineering practice are turbulent, so Flow Simulation was mainly developed to simulate and study turbulent flows. To predict turbulent flows, we use the Favre-averaged Navier-Stokes equations, where time-averaged effects of the flow turbulence on the flow parameters are considered, whereas the other, i.e. large-scale, time-dependent phenomena are taken into account directly. Through this procedure, extra terms known as the Reynolds stresses appear in the equations for which additional information must be provided. To close this system of equations, Flow Simulation employs transport equations for the turbulent kinetic energy and its dissipation rate, the so-called k-ε model.