BY : CHAM Development Team - M R Malin

FOR : PHOENICS Validation of Turbulence Modelling Options

- Two-dimensional turbulent buoyancy-driven flow in a tall rectangular cavity of 5:1 aspect ratio.
- Rayleigh number of 4.E10.
- Cartesian computational grid.
- Turbulence represented via a buoyancy-extended version of the Lam-Bremhorst low-Reynolds-number k-e turbulence model.
- Variable physical properties employed for the air flow.
- Isothermal side walls and adiabatic horizontal walls.
### NOTES :

- The flow has been studied experimentally by Cheesewright et al [1986] and numerically by Davidson [1990].
- The mesh employed is 56 by 56 using a high concentration of grid cells in the boundary layers on the vertical walls.
- The vertical walls are isothermal with an imposed temperature difference of 45.8 degC, and the horizontal walls are adiabatic.
- The calculation is based on the library case 296.
- The calculation employs a temperature-dependent density, thermal conductivity and laminar viscosity.

Velocity vectors (m/s)

Temperature contours (Deg K)

Measured and predicted vertical velocity profiles at y/H=0.5

Measured and predicted turbulence energy profiles at y/H=0.5