Numerical Investigations on Heat Transfer of Self-Sustained Oscillation of a Turbulent Jet Flow Inside a Cavity

Abstract

Computations of heat transfer and fluid flow of a plane isothermal fully developed turbulent plane jet flowing into a rectangular hot cavity are reported in this paper. Both velocity and temperature distributions are computed by solving the two-dimensional unsteady Reynolds-averaged Navier-Stokes (URANS) equations. This approach is based on onepoint statistical modeling using the energy-specific dissipation (k-x) turbulence model. The numerical predictions are achieved by finite volume method. This problem is relevant to a wide range of practical applications including forced convection and the ventilation of mines, enclosure, or corridors. The structural properties of the flow and heat transfer are described for several conditions. An oscillatory regime is evidenced for particular jet location, inducing for each variable a periodic behavior versus time. The jet flapping phenomena are detailed numerically by the instantaneous streamlines contours and the vorticity magnitude contours within one period of oscillation. The heat transfer along the cavity walls is also periodic. Time average of mean Nusselt number is correlated according with some problem parameters.

CFD modeling of a self-oscillatory airflow regime in the test ventilated room with plane supply opening

“…The test configuration by Mataoui et al has been already used for numerical data validation, both by the same research group (see [3][4][5][6][7]) and by other research groups [8,9]. Note that most papers presented results obtained with 2D unsteady Reynolds-averaged Navier-Stokes (URANS) approach.…”