BY: M R Malin & S Semin - CHAM Development Team O Olsvik - STATOIL, RTD, Norway

The problem considered is 2-dimensional axisymmetric, steady, turbulent isothermal swirling flow in the laboratory furnace of Weber et al (Int.J. Heat and Fluid Flow, Vol.11, No.3, p225 (1990)).
The main objective of the calculations is to validate both the staggered- BFC momentum equations and the turbulence modelling for swirling flow.
The calculations are a precursor to applying the PHOENICS extended SCRS attachment to swirling gaseous combustion in an industrial furnace.

The flow geometry consists of a solid-body vortex generator of 0.19m diameter, a 20-degree conical burner quarl with an expansion ratio of 2, and a cylindrical furnace of 0.44m diameter.
The flow Reynolds number was about 50,000 with an inlet vortex of 0.75 swirl number and low turbulence intensity (1%).
The flow is simulated using a 2d axisymmetric staggered BFC system by means of the recently-developed GROUND attachment for solving the momentum equations on 2d BFC staggered meshes with swirl.
The turbulence is represented by use of the two-equation KE-EP turbulence model of Chen and Kim [1987].
A mesh of 28 radial cells by 82 axial cells is used for a computational domain length of 4m.

Pictures are as follows: