Computer graphics and theoretical descriptions of density are used to obtain computer-genirated flow visualizations called computational interferograms. Computational interferograms are pictorially analogous to optical interferograms, and examples showing the fringe pattern for the flow about a sharp-tip cone in a supersonic air stream are presented. To ascertain the effect of unsteady behavior, local density disturbances are added to the steady-state flow field. This introduces into the computational interferogram irregularities like those seen in optical interferograms. These theoretical disturbances can be varied in geometry and density description, translated with time, and strength-ened or dissipated. The accuracy of computational interferometry relies on the accuracy of the theoretical density description and, therefore, provides a way of verifying existing models of flow fields, especially those containing unsteady or turbulent behavior. In addition to being a unique method of flow visualization, computational interferometry can be used to develop and modify theories or numerical solutions to both simple and complex flow fields. The present research is a general description of this process.
A. George Havener,
L. A. Obergefell,
"Computational Interferometric Description Of Nested Flow Fields," Optical Engineering 24(3), 243441 (1 June 1985). https://doi.org/10.1117/12.7973504