Numerical simulation for a flow around body ejection using an axisymmetric unstructured moving grid method

摘要

An unstructured moving-grid finite volume method is developed for an axisymmetric grid system. In this paper, the method is applied to a body ejection problem. When a body is ejected through a cylinder, complicated motion of the body and complicated flow phenomena occur. It shows that the body is separated from the cylinder. Thus, in the case of a body fitted coordinate system, computational elements should be created and eliminated according to the motion of the body. Furthermore by ejection of the body, two separated physical spaces between the inside of the cylinder and the outside of the cylinder are combined in an instant. Then, to capture a sudden change of flow at the point, it is necessary to generate a valid mesh around it. In this paper, a new method is constructed satisfying the geometric conservation law perfectly.