An efficient grid generation scheme has been developed for realistic aircraft configurations. The scheme is based on a zonal approach that simplifies the grid generation process and permits greater flexibility in modeling three-dimensional geometries. In the present scheme, the computational space around a multicomponent aircraft configuration is divided into a number of non-overlapped blocks whose boundaries define the configuration surfaces and the limits of the computational space. H-type grids are generated independently in each region using a hybrid two-dimensional elliptic/algebraic grid generation algorithm. The block grids are then smoothly patched together along common surfaces to ensure proper transition from one block to another. Examples of the generated grids for fighter aircraft demonstrate the effectiveness of the zonal grid generation scheme in modeling complex configurations.
The focus of current research is the measurement, modeling, and simulation of the spatial, temporal and spectral behavior of gaseous radiation from a jet engine exhaust plume. Infrared imaging using a scanning infrared camera has been used as a flow visualization technique. Also, an infrared band model code has been developed to relate field variables to infrared emission. The model has been validated by comparisons with other infrared band models and by comparisons with experimental data. Finally, a free-jet apparatus has been constructed based on an auxiliary power unit, and a computer code has been developed for converting the experimentally measured exhaust plume temperature distribution to the corresponding infrared image. These efforts represent work in progress. The goals of this research are to better understand infrared imaging of exhaust plumes, to correctly model the infrared emission from exhaust plumes given knowledge of the temperature, pressure, and species distribution of the flow field, and finally to use this model to validate CFD codes through comparison of predicted and observed infrared images.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.