532
S. Balasubramanian et al.
Fig. 4 Unstructured grid with density box (32 lakhs cells)
Fig. 5 Convergence plot for drag coefficients at various Mach numbers
base drag coefficient percentage is very high, M = 1.2 both forebody and base drag
coefficient contribution is equal and M = 6 the forebody drag coefficient percentage is
high. More details related to base flow and base pressure are presented in [3]. Figure 7
shows the variation of forebody drag and base drag coefficients with Mach numbers
and it is observed that both forebody and base drag coefficients are increasing from
subsonic to transonic Mach numbers, beyond that base drag coefficient is decreasing
drastically whereas forebody drag coefficients remain more or less constant.
Figure 7 also shows the pressure and viscous drag coefficient contribution for
the total drag coefficient. It is observed that pressure drag is dominant for a blunt
cone configuration; the viscous drag part is very low/negligible as compared to the
pressure drag coefficient. Figure 8 shows surface Cp palette over the configuration
typical subsonic, transonic, supersonic and hypersonic Mach numbers. It is observed
that the Cp stagnation value is increasing with an increase in Mach numbers. Lower