Dynamic Behavior of Balloon during Its Launch; Application of Panel Method and Extension to Unsteady Problem

摘要

The boundary integral method (Panel method) has been applied and extended to investigate the unsteady problem in which body shape is deformed dynamically due to flow effects inside or outside the body. Such an unsteady effect has been represented by use of an extension of the conventional panel method. The interaction between the deformation of the body and the flow field is represented as a Virtual Mass Matrix, and the motion of the body surface and the flow field are solved by tracing the control points distributed on the body surface. Integral relations of the singularity distributed on the panel are also presented. Techniques developed are applied to the dynamic simulation of a balloon launching. A series of simulation studies was carried out and the deformation of the balloon during its launch has been followed. The dynamic behavior of the balloon during launching and the load history of the balloon membrane are obtained.