Wet steam condensing flow in low-pressure steam turbine leads to efficiency losses and blade erosions. In order to investigate this problem by numerical approach, an Eulerian/Eulerian model has been developed, in which the wet steam is regarded as mixture comprising two coupled systems: the vapor phase and the liquid phase. These two systems are both described by conservation equations. High resolution TVD scheme is employed to capture condensing phenomena in wet steam flow. This model has been validated by numerical simulations of condensing flows in 1D and 2D nozzles. Compared with experimental data, a good agreement is observed. This Eulerian/Eulerian model can be extended to 3D calculation of condensing flow. Wet steam condensing flow in low-pressure steam turbine leads to efficiency losses and blade erosions. In order to investigate this problem by numerical approach, an Eulerian / Eulerian model has been developed, in which the wet steam is characterized as mixture comprising two coupled systems These two systems are both described by conservation equations. The high resolution TVD scheme is employed to capture condensing phenomena in wet steam flow. This model has been validated by numerical simulations of condensing flows in 1D and 2D nozzles . Compared with experimental data, a good agreement is observed. This Eulerian / Eulerian model can be extended to 3D calculation of condensing flow.