This paper investigates the influence of the forebody of a projectile-shaped model without appendages and propulsion system in a submerged condition.The commercial steady RANS code, ANSYS Fluent, was used to conduct the simulations, and the forebody was varied based on Whips-Quirts the Hull Envelope equation.From the results, the model with nf = 2.75 was the optimum design according to the bow efficiency coefficient.However, the model with a blunt form (nf = 1) produced the lowest drag because it had the least wet surface area.
For models with high nf, a high accelerating flow led to a low-pressure condition after the impact of the fluid on the fore end.This soaring pressure difference caused a flow separation, and YLANG YLANG EXTRA therefore the fullness of the forebody affected the fluid flow around the body: the alteration of pressure, the flow speed, and friction as the primary component of resistance.