Numerical Simulation of Airflow Pattern at Working Face with Forced Auxiliary Ventilation

The 3-dimensional k-e turbulent flow model is used to describe the airflow at working face with forced auxiliary ventilation. Computational Fluid Dynamics (CFD) is introduced to obtain the numerical values of the airflow field at the working face. Control volume method is used to derive the required discretizatio n equations from the governing equations. The SIMPLE (Semi-Implicit Method for Pressure-Linked Equations) procedure is applied to get the numerical values of the flow field. The combination of TDMA (Tri Diagonal-Matrix Algorithm) and Gau ss-Seidel method is formed to solve the discretization equations line by line. Under-relaxation is employed to avoid the divergence in iterative solution of n onlinear equations. Fundamental airflow patterns in a working face with forced a uxiliary ventilation are elucidated. The results of the calculation of airflow s how close agreement with the experimental data. The study provides an important basis for establishing a proper method for the prediction of the thermal environ ment conditions and for the study of the distribution of gas on locally ventilat ed working places.