A semi-analytical solution to the virtual mass of a spherical particle accelerating at high speed is obtained. Boundary layer separation coupled with potential flow was assumed around the solid sphere. The new solution of the virtual mass coefficient CV converges to the original solution of 0.5 upon removing the separation. The author showed earlier (Kendoush, J. Appl. Mech. 72(801)2005) that the virtual mass coefficient could reach a value of five for a rotating sphere in fluids.

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