Computation of axisymmetric confined jets in a diffuser
Abstract
The paper reports a numerical study of turbulent confined jets in a conical duct with a 5 deg divergence. The flow has a large ratio of jet to ambient velocities at the entrance so that it gives rise to strong recirculation. The calculations are carried out with a general finite-volume method designed for calculating incompressible elliptic flows with complex boundaries. Turbulence is simulated by the standard k-epsilon model. The sensitivity of the solution to numerical discretization errors is examined using three conversion schemes, i.e., hybrid central/upwind differencing, QUICK, and SOUCUP on two grids consisting of 68 x 102 x 82 points respectively. An examination is also made of the influence of inlet-boundary conditions on the predicted flow field. The computed results are compared with experimental data for mean axial velocity, turbulent shear stress and turbulent kinetic energy profiles. It is shown that the calculations reproduce the essential features of the flow observed in the experiments.
- Publication:
-
International Journal for Numerical Methods in Fluids
- Pub Date:
- January 1992
- DOI:
- 10.1002/fld.1650140209
- Bibcode:
- 1992IJNMF..14..241Z
- Keywords:
-
- Diffusers;
- Finite Volume Method;
- Jet Flow;
- K-Epsilon Turbulence Model;
- Shear Flow;
- Computational Fluid Dynamics;
- Computerized Simulation;
- Flow Distribution;
- Kinetic Energy;
- Fluid Mechanics and Heat Transfer