微重力条件下熔体中对流过程的数值模拟

微重力条件下生长优质晶体遇到的最大问题是要控制晶体生长的条件，抑制由于重大的减弱而引起的熔体中的热毛细时流。但是，用实验来解决这些问题费用高，周期也长，而且有时完全用实验来模拟也是很困难的。用数值计算方法来模拟微重力条件下熔体中的对流过程是空间晶体生长研究的一个重要的方向，计算结果对控制空间生长晶体和抑制熔体中的对流有指导意义。对微重力条件下熔体中对流发生、发展的过程进行了数值研究。以有限差分法研究了沿上表面为自由表面的水平区域不同边界条件下的熔体中的对流过程。

NUMERICAL SIMULATION OF THE CONVECTION PROCESS IN THE MELT UNDER THE MICROGARAVITY CONDITION

To control the conditions of groimg crystal and to restrain Marangoni convections in the melt caused by weak gravity is puzzles when growing excellent crystal in the microgravity condi-tion. However,solving all of these problems by the way of testing, not only to spond high economic invest and long test time,but also sometime it is very difficulty for us to truly simulate by means of experiment.It is a important researching branch of growing crystal in space to simulate convection process in the melt hi the microgravity condition by numerical simulatIOn,calculating result has guiding significant for controlling the growth condition of crystal in space and for restraining convection in the melt.The results of numerical research about convection to occur and evolve in the melt are described and the convection process in the horizontal zone of the hielt, upper which there are free surface and different boundary conditions have ben studied by the finite difference method.