This paper describes the results obtained by free surface analysis of impinging jet nozzles for a wide range of orifice diameter and jet momentum under non-reactive conditions. The numerical results are compared with experimental results under some conditions. Capability of the present simulation method CIP-LSM to impinging jet atomization is confirmed by comparing the fan-shaped liquid condition after impingement. As a consequence, the present method can simulate the angle of the liquid after the impingement and the impinging modes approximately. The numerical analysis for three sector of simulant thruster is conducted and it is confirmed that interactions between fans are demonstrated.