Based on three-dimensional Navier-Stokes equations closed with Spalart-Allmaras(S-A) turbulence model,the computational fluid dynamics(CFD) numerical simulation was used to investigate the drag characteristics of extended range guided munition(ERGM) having different stern and tail sectional shapes.

Through CFD numerical analysis,simulated calculated the pressure distributing of flow field near the parabola stern of a fairing,and got the graph expressing the relationship between base drag and the ratio between stern length and fairing height.

Study of scattering properties by ship wakes;

The normalized volume scattering function and energy distributing function of bubble populations in ship wakes are calculated by Mie theory,and based on which,the forward light scattering properties of bubble populations is analyzed.

The energy distribution properties of light scattered by bubbles in far ship wakes were studied to study the detection and homing mode of optical wakes.

Turbidity and light extinction characteristic of ship wake is calculated and analyzed based on the Mie s scattering theory.

Large number of microbubbles in ship wake field scatter laser beam passing through them more intensively than sea water,where forward scattering takes dominant position.

For researching the ship wake characteristic and mechanism by means of experimental measurement and theoretical analyse.

In this paper, two indirect methods for the estimation of a moving ship s speed by using remote sensing techniques are discussed because there is a close relation between static characteristics of ship wake and ship speed.