Numerical Simulation Analysis of Supersonic Asymmetric Converging-Diverging Nozzle with Stepped Curvature and Curved Discretization

A numerical simulation, using the Cartesian and Body Fitted Coordinate (BFC) structured mesh, has been conducted to investigate fluid dynamics inside the asymmetric supersonic Converging-Diverging (CD) nozzle. Two models of nozzle mesh generation namely stepped curvature and curved were simulated to obtain the flow parameters and turbulence properties. The turbulence model of Standard (STD) k-epsilon has been applied to solve the two planar nozzles with 3510 cells of the stepped model and 3298 independence grid cells of the curved model. The result of flow parameters such as the distribution of pressure, temperature, density, and Mach number (Ma) was theoretically verified for satisfying the compressible flow analysis. It was obtained that there was a difference between the stepped and curved mesh models, in case of flow properties, inside the divergent section of the nozzle. The existence of stepped profile has resulted in gaining the static pressure, as the consequence of friction loss, thus influencing the turbulence properties such as turbulent kinetic energy and dissipation rate, as well the occurred shock structure.