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This work considers the aerodynamic characteristics of the reentry vehicle (RV) of a segmental-conical shape, and the parachute container hatch cover (PCHC) during its separation. Due to the aerodynamic interference, the hatch may collide with the RV. The authors propose a method of studying the aerodynamic characteristics of the PCHC and RV based on modelling using the dynamic mesh technology in the FlowVision software package. Stationary flow around the RV until the hatch cover separation, flow around the hatch cover and free flow are calculated. As the result of the calculations, the PCHC trajectories (excluding gravitational forces) under various initial separation conditions, as well as the aerodynamic characteristics of the RV are obtained. The cases when the hatch cover collides with the RV are identified.

The paper considers the effect that the separating process of a parachute container hatch door (PCHD) in the base of a reentry vehicle has on their aerodynamic characteristics. The FlowVision software package was used for flow simulation. With the help of a dynamic mesh, the trajectories of the PCHD movement were obtained without taking into account the gravity. The aerodynamic characteristics of the reentry vehicle and PCHD (in motion) were determined. The cases in which the PCHD and reentry vehicle may collide were identified. For these cases, a pulse analysis was carried out and the minimum initial velocity for the safe separation of the PCHD was determined.