A out-of-control drift model for a ship in breakwater area was established,in which the parameters of natural conditions in breakwater area were setting,as well as the effective width of breakwater entrance,ship\'s size and the distance between the out-of-control site and the transversal drift distance.

Drift Model for Ship out of Control at Sea;

Precisely determining the drift model coefficients is the key to successful long-time operation with the na- vigation systems.

It points out that the chose of distribution parameter C o and drift velocity V vj may have significant effect on the result of static and dynamic analysis of the system, when one dimensional two phase flow drift model with conservation equations for mass, steam, energy and momentum was used.

Drift flux model is prevailing for the prediction of void fraction in two-phase flow,whereas distribution parameter C0 and drift velocity ugj of the model are an issue argued by different researches until now.

In the calculation of void fraction, Zuber-Findlay drift flux model is the most famous one.

Based on the theory of bifurcation and its DERPAR algorithm, the static bifurcation solution diagram of a typical twophase natural circulation system is analyzed using drift flux model, and compared with the results of homogenous model.

The two_phase drift_flux model was used to estimate gas holdup for three_phase Newtonian and two_phase non_Newtonian systems.