Abstract:Based on Feature Flow Fields[1], vortex will automatically extract and track in a flat time-varying flow field and multi-vortex structure. The new algorithm is to extract the vortex areas of flow field to determine the vortex core range, using the method of tracking the vortex core flow line integral, precision tracking vortex core in the three-dimensional feature flow field and recording the specific path of evolution in the integrand flow line. Thus for the flow field in the different periods of evolution can be observed directly laid the foundation.used for tracking the vortex core flow line integral, by extracting the vortex areas of flow field to determine the vortex core range, precision tracking vortex core in the three-dimensional feature flow field and recording the specific path of evolution in the integrand flow line. The new algorithm using the flow line can describe the dynamic behavior of characteristics of vector field. The evolution of the flow field is more intuitive to observe the evolution of different periods, which laid the basis for visualization.