Topology of three-dimensional, variable density flowsThis paper is concerned with the interpretation of unsteady, variable-density flow fields. The topology of the flow is determined by finding critical points and identifying the character of local solution trajectories. The time evolution of the flow is studied by following the paths of the critical points in the three-dimensional space of invariants of the local deformations tensor. The methodology can be applied to any smooth vector field and its associated gradient tensor including the vorticity and pressure gradient fields. This approach provides a framework for describing the geometry of complex flow patterns. Concisely summarizing that geometry in the space of invariants of the local gradient tensor may be a useful way of gaining insight into time-dependent processes described by large computational data bases. Applications to the descriptions of a flickering diffusion flame and a compressible wake are discussed.
Document ID
19910061726
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Cantwell, Brian (Stanford Univ. CA, United States)
Lewis, Gregory (Stanford University CA, United States)
Chen, Jacqueline (Sandia National Laboratories Livermore, CA, United States)