A CFD investigation of nozzle position effect and turbulent flow phenomena of a hyperloop model

Abstract

This investigation analyses a conceptual hyperloop model in a low-pressure tube using CFD simulation technique. A precursor validation study, similar to a published work, is adopted, and used as a baseline model to develop a replication of hyperloop configuration. The study continues with 2D simulations of three rear nozzle positions to identify a low-drag configuration, steady 3D simulations to capture more complex mean flow features, and unsteady 3D simulation to analyse time-dependant flow characteristics. It was found that the lower the rear nozzle position, the better the drag reduction, with an optimal slope angle of 8° for no flow separation around the nozzle. Furthermore, the front nozzle before the compressor should include a divergent section with careful design of the tip geometry and angle of the nacelle. A region with high temperature occurring on the underbody of the pod highlights the importance of thermal design for heat dissipation.