Investigations on different propulsion system modes on the performance of a commercial aircraft by approximated CFD simulations

In the study of aerospace transportation systems, it is crucial to study the aerodynamics of aircrafts in order to maximize flight performance along with optimizing operational efficiency and revising some design patterns. On the other hand, despite the development of aviation science, the occurrence of accidents is inevitable due to the existence of a technical defect, and it is vital for designers to anticipate the occurrence of such tragic accidents, especially in propulsion system. In this study, the methods of computational fluid dynamics and Fluent commercial software, to compute the flow field obtained from the propulsion system of the Boeing 800-737, is used in three positions: on, off and blocked. Pressure alternations and other crucial parameters are obtained by using numerical solution of the compressible flow governing equations. Various aerodynamic parameters including lift, drag and lateral forces and roll, pitch and yaw torques on the wings have been calculated in the so-called situations and the displacement of the wing pressure center has been discussed in terms of changing the status of propulsion system. Also about changes in the parameters of pressure coefficient, Mach number and magnitude of vorticity at different sections on the wing are discussed in cruise flight mode and constant atmospheric conditions.