Numerical Simulation of Flow Behavior in Tight Lattice Rod Bundle

The Numerical investigation is performed on the air turbulent flow in triangular rod bundle array.Based on the experimental data,the eddy viscosity turbulent model and the Reynold stress turbulent model are evaluated to simulate the flow behavior in the tight lattice.The results show that SSG Reynolds Stress Model has shown superior predictive performance than other Reynolds-stress models,which indicates that the simulation of the anisotropy of the turbulence is significant in the tight lattice.The result with different Reynolds number and geometry shows that the magnitude of the secondary flow is almost independent of the Reynolds number,but it increases with the decrease of the P/D.