Abstract: A joint simulation method of liquid sloshing of liquid tanks based on UDP communication protocol is firstly introduced in this paper. The method uses FLUENT to calculate the liquid sloshing force, moment and center of mass results of the moving tanks. Based on the satellite dynamics program, the linear and angular velocities are calculated through control algorithms and strategies after obtaining the tank sloshing results. The twoway data exchange between them is achieved through a communication interface developed in C/C++ code. Then, with the help of the above joint simulation method, the joint simulation analysis of the tank sloshing is carried out and compared with the inorbit remote sensing data. And then the liquid sloshing characteristics of the four tanks in pitch 0~25° maneuvers are analyzed. Finally the liquid sloshing characteristics of the blades with and without holes under the control of the satellite dynamics are compared and analyzed. Under nontrajectory conditions, the peak sloshing force and moment of 2nd and 3rd tanks are larger than those of 1st and 4th tanks. The peak Ydirectional sloshing force of the four tanks is in the range of 1.05 N~1.96 N. The moment values are in the range of 0.05 N·m~0.36 N·m. The stirring effect of the blades with holes on the liquid is weaker than that of the blades without holes. The bubbles stirred by the nonporous blades show a significant stretching and centrifugal motion, and result in greater fluid velocity.

Key words: bipropellant, satellite dynamics, UDP communication protocol, liquid sloshing, joint simulation