Numerical Investigation on Optimized Convergent Divergent …
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Fig. 5. Operating conditions are set to the atmosphere, and the inlet absolute operating
pressure and the exit pressure are set to be 200 kPa and atmosphere, respectively, as
predicted by the firefly algorithm.
To proceed further, the grid independence test is carried out and found that mesh
points of 8000 is optimum. The density-based solver with k-ω SST a turbulence
model is used. The centerline Mach number of CD nozzle is shown in Fig. 6a,
and the respective Mach contour is shown in Fig. 6b. The shockwave location is
identified as 0.073 m from the divergent section, and the ratio of shockwave location
to divergent length X s is 0.5 which is close to shockwave location used in the firefly
optimization scheme.
Fig. 5 2D computational domain with mesh
Fig. 6 Numerical simulation
99
Fig. 5. Operating conditions are set to the atmosphere, and the inlet absolute operating
pressure and the exit pressure are set to be 200 kPa and atmosphere, respectively, as
predicted by the firefly algorithm.
To proceed further, the grid independence test is carried out and found that mesh
points of 8000 is optimum. The density-based solver with k-ω SST a turbulence
model is used. The centerline Mach number of CD nozzle is shown in Fig. 6a,
and the respective Mach contour is shown in Fig. 6b. The shockwave location is
identified as 0.073 m from the divergent section, and the ratio of shockwave location
to divergent length X s is 0.5 which is close to shockwave location used in the firefly
optimization scheme.
Fig. 5 2D computational domain with mesh
Fig. 6 Numerical simulation