SIMULATION METHOD AND APPARATUS FOR BUBBLE ENVELOPING OF SHIP AND COMPUTER-READABLE MEMORY MEDIUM WITH SIMULATION PROGRAM

摘要

A computer simulation of bubbles enveloping a ship is performed by a. calculatin g a turbulent flow energy and an energy loss caused by an energy dissipation factor as well as an average fluid velocity in each of cells defined by three-dimensional orthogon al lattices constructed in a flow field including a turbulent boundary layer formed about a submerged surface of the ship; b. simulating a generation and ejection of a bubble into th e turbulent flow layer at a given time from a given jet outlet with a given initial bubble v elocity; c. calculating directional bubble velocities in each of cells according to the turb ulent flow energy, the energy dissipation factor, the average fluid velocity and random num bers; d. calculating a bubble location at a succeeding unit time by solving equations of motion according to the directional bubble velocities and average fluid velocity; e. ca lculating a void fraction in each of cells according to the bubble location at the succeedin g unit time; f. repeating step c to step e for another bubble for a given number of iterations u ntil an integer time is reached by incrementing a time parameter by a unit time; and g. calculat ing distribution of void fractions in all cells to represent an overall distribution of bubbles at the integer time, and terminating computation when it is decided that the distributi on of bubbles is converging.