Study of turbulence analysis code

Thermal hydraulic experiments and analyses in water have been performed to study in-vessel thermal hydraulic phenomena of a pool-type LMFBR. These phenomena are highly turbulent, and the authors need an in-vessel hydraulic analysis code with which the turbulent phenomena can be accurately estimated. They have developed and applied a new analysis code to which the two-equation turbulence (k-σ) model was introduced. This code was applied to the simulation of the above-mentioned water tests and we have evaluated its effectiveness by comparison with experimental results. The k-σ model can well simulate thermal hydraulic phenomena in general except corners, outlet and density stratified areas where nonisotropic features are dominant