Application of 3D n units conjoined CFD model to numerical simulation of air flow in underground railway engineering

Based on the requirements of numerical simulation of air flow in the HVAC and smoke control and extraction systems design for underground railway station and regional tunnel, analyses the main problems in the numerical simulation. Recommends the 3D n units conjoined CFD model to correct and verify 1D network model. The result indicates that the 3D n units conjoined CFD model which combines the accuracy of 3D model with the networking and efficiency of 1D model is an effective tool for correction and verification of 1D network model and can meet the design requirements of underground railway engineering.