Development of a highly accurate interpolation method for mesh-free flow simulations I. integration of gridless, particle and CIP methods

摘要

A simple, efficient, flexible and accurate interpolation method, CIVA, is introduced for use with mesh-free methods for flow simulations. The method enables mesh-free cubic interpolation with the local co-ordinate system, such as volume and areaco-ordinates, by utilizing the concept of the CIP scheme and allows the development of new highly accurate mesh-free methods. The mesh-free methods integrate the gridless, particle and CIP methods since they have flexibility in the treatment of movingcalculation points. For achieving high accuracy with the CIVA method, it is also important to correctly evaluate particle movement. The improvement of the evaluating algorithm is another objective of this study. The validity of the algorithms is confirmed by applying them to the convection and convection-diffusion problems. Since the CIVA-based mesh-free methods enable flexible, efficient and accurate fluid simulation, they make it possible to perform highly accurate simulations of many kinds of problemsthat involve complicated geometries and phenomena.