老师出了一个作业 总共有8个步骤 但我光是前4个步骤就写了一个多礼拜... 刚刚发现 我不懂第6步骤的意思 附上题目 想请各位帮我解释一下题目在说甚麽 希望有好心人士可以救救我......T_T 作业大致上是要在一个20x20的周期性边界内(二维 模拟2个等质量等半径的圆 进行弹性碰撞的结果 (1) To write a Hard-Sphere Molecular Dynamics simulation program, we start from: Step 1. Assume the system has only two spheres with the same mass and same size (r=1) in a periodic 2-D space that is 20 unit size by 20 unit size. The spheres initially stay at (1,1) and (5,5) with velocity (0.3, 0.4) and (-0.3,-0.4), respectively. Step 2. Write a code (subroutine) to read initial conditions of the system Step 3. Write a code (subroutine) to estimate the collision time Step 4. Write a code (subroutine) to advance the spheres to the collision point. Step 5. Write a code (subroutine) to perform collision (change velocity) **Step 6. Write a code (subroutine) to advance the spheres without collision for a small timestep=0.1 (step 4 and step 6 may combine together) Step 7. Assemble subroutines from Step 3 to Step 6 to form a Simple Hard-Sphere Molecular Dynamics simulation program 不知道是否适合在这里问 但因为这作业要用fortran写 所以希望各位可以帮我.... 不适合在此发问的话 我会尽快删文 谢谢!! --

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