Numerical Simulation of Channel Flow with Fluid Injection Using MILES Approach

A numerical simulation of the unsteady flowfield in a channel with fluid injection through a porous wall is performed using MILES approach. Different states in such flow evolution are identified. Near the head end, the flow is laminar. At the middle of the channel, turbulence appears and then develops until the channel exit. The perturbation necessary to launch the transition process for the MILES simulation is obtained thanks to the time integration scheme used with a CFL value large enough to introduce a numerical destabilization into the flowfield. Computed results are compared with existing experimental data and with a two‐dimensional RANS k‐l simulation, including mean velocity and turbulent profiles. Analysis of the results shows that mean flow properties and transition process are reproduced in good agreement with the experimental data. The three‐dimensional MILES simulation gives more reliable results at the beginning of the transition process compared with the two‐dimensional RANS computation.