In addi- tion,the wells of the tunnel and shaft were described with wall functions to simulate the micro-pressure wave p.

The computed results were compared unfavorably with experimental data when adopting RNG k-ε turbulent model with standard wall functions.

The numerical procedure is based on preconditioned secondorder accurate backward difference in time, and the near wall functions is applied to deal with the wall of tunnels.

To this end, the wall function of the sub-grid Reynolds stress model was modified to obtain a better result.

The computed and analyzed results show that: the ASM model and the RNG k-ε model are more stable than the Realizable k-ε model and accurate than the standard k-ε model with the change of cavitation number,and the enhanced wall function is more stable and more accurate than the standard wall function and the non-equilibrium wall f.

For the simulation of flowfield in complex domains, the wall function method in three-dimensional arbitary curvilinear coordinates for treating near wall region is given.

Implementation of wall function method was proposed for analyzing the step wise solid boundaries in the fluid region.

The RNG k-ε turbulence model with two near-wall treatment,respectively the standard wall function method and the two-layer wall function method,was adopted to simulate the characteristics of the turbulent jet in crossflow.

The κ ε two equation model and wall function were chosen to simulate the turbulent flow and temperature field of normal marine exhaust system numerically.

The κ ε two equation model and wall function were adopted to numerically simulate the turbulent flow and temperature field of the infrared suppression device of marine exhaust system.