C212 渦要素による非定常流れの解析について

概要

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Recent developments of numerical techniques and computer system have enabled us to obtain a highly accurate CFD results for steady and unsteady flow fields. However, it becomes difficult to analyze such results due to the huge amount of data. Major issues are addressed on a handling of those data in comparing with other results, extracting useful information, archiving in a database and exchanging among the researchers. To solve these problems, we have proposed a concept of extracting a vortical structure from the flow fields. The vortical structure is often considered as a skeletal structure of a flow field. However, it is not easy to directly extract such structure from a computed flow field. In this paper, we utilize an image processing technique to settle a vortical structure in the computed unsteady flow field. In a two-dimensional case, we substitute some point-vortices for the distribution of the vorticity. Vortex stick is a candidate in three-dimensions. Those vortex elements are utilized for the analysis of some unsteady flow fields.
日本流体力学会の論文
2001-07-31