Paper presented at the 6th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 30 June - 2 July, 2008.
The research field of the study is related with turbulence
modeling. The general objective is the implementation in a
commercial code, of two equations Non Linear Eddy Viscosity
Model (NLEVM) which removes Boussinesq linear
approximation for the Reynolds stress tensor. The work
described in the paper implements a second order k-ε model
based over Shih, Zhu and Lumley (1993) [1] and Craft,
Launder and Suga (1996) [2] in the finite volume commercial
code ANSYS-FLUENT v. 6.3.26, by writing additional
subroutines. The model has been validated through
experimental and DNS data available in the literature. The
benchmarks shown in this paper are the straight Square Duct
[8] and the Backward-Facing Step [9, 10]. After the validation,
the model has been used for predicting the flow behavior for
complex industrial applications. The geometry used is similar
to the bowl-shape downcomer of nuclear reactor. This is an
application field of interest still under study by the same
research group and an international consortium.
