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! engines/fortran/main.f90
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! ------------------------
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! Fortran 动力学模拟引擎(模板/参考实现)。
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!
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! 接口与 C 引擎一致:
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! 输入: param.json, <input_dir>/coord.txt, connection.txt, bond.txt
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! 输出: <output_dir>/trajectory.txt (JSON)
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!
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! 编译:
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! gfortran -O3 -march=native -o build/dynamics_f90 main.f90
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!
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! 用法:
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! ./build/dynamics_f90 <input_dir> <output_dir> <param_json>
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program dynamics_f90
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implicit none
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character(len=256) :: input_dir, output_dir, param_path
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integer :: narg
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narg = command_argument_count()
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if (narg < 3) then
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write(*,*) "用法: dynamics_f90 <input_dir> <output_dir> <param_json>"
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stop
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end if
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call get_command_argument(1, input_dir)
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call get_command_argument(2, output_dir)
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call get_command_argument(3, param_path)
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! TODO: 实现与 C 引擎相同的物理模拟
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!
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! 参考实现:
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! 1. 读取 param.json → NT, DT, G, B, ...
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! 2. 读取 coord.txt → 原子数, 质量, 位置, 速度
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! 3. 读取 connection.txt + bond.txt → 成键参数
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! 4. Leapfrog 循环 NT 步
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! 5. 输出 trajectory.txt (JSON 格式)
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write(*,*) "[Fortran-engine] 待实现"
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end program dynamics_f90
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