The structural dynamic analysis of a space vehicle during atmospheric flight requires knowledge of the mean and fluctuating pressure distribution over the surface of the vehicle. Computational fluid dynamic techniques can readily calculate the mean pressure component but not the fluctuating component. Experience with the turbulence analysis (TURBAN) software model will be applied to develop an accurate and efficient method to predict the intensity of surface-pressure fluctuations based on the properties of the mean flow field as computed by standard CFD procedures. Specific objectives for Phase I are: to establish the basic governing equation for the covariance of pressure fluctuations; to determine the most practical numerical procedure; to develop computational algorithms; to select candidate two-dimensional incompressible flow problems which have CFD solutions; and to predict distribution of surface pressure fluctuations. During Phase II, the technique would be expanded to apply, first, to three-dimensional incompressible flow and, then, to two-dimensional and three-dimensional compressible flow. In its final stage of development, the concept would take the form of a CFD post-processor which could be used in conjunction with a variety of CFD software programs.
Potential Commercial Applications: Commercial applications would be through the sale of the software as a post-processor to companies developing and utilizing CFD software.STATUS: Project Proceded to Phase II
