README.md

DiffVOF Simulation Data / DiffVOF 仿真数据

OpenFOAM interFoam 2D VOF two-phase flow simulation data for the DiffVOF+NN paper revision. 用于 DiffVOF+NN 论文大修的 OpenFOAM interFoam 2D VOF 两相流仿真数据。

Directory Structure / 目录结构

Exp/data/
├── templates/              ← Case templates / 仿真 case 模板
│   ├── dam_break/          ← 2D 溃坝 (128×128)
│   ├── rising_bubble/      ← 2D 气泡上升 (128×256)
│   ├── stokes_wave/        ← 2D Stokes 波 (256×128)
│   └── droplet_impact/     ← 2D 液滴撞击 (128×128)
│       └── base/           ← OpenFOAM case: 0/ constant/ system/
├── raw/                    ← Raw simulation data / 原始仿真数据
│   ├── {case_type}/tNN/    ← 50 trajectories per type, t00-t49
│   │   ├── 0/              ← Initial fields (U, p_rgh, alpha.water)
│   │   ├── constant/       ← Physical properties + mesh
│   │   ├── system/         ← Solver settings (controlDict, fvSchemes, ...)
│   │   ├── {time}/         ← Reconstructed field snapshots
│   │   ├── log.interFoam   ← Solver log (ends with "End" if complete)
│   │   └── log.blockMesh   ← Mesh generation log
│   └── ...
├── processed/              ← HDF5 processed data / 处理后 HDF5 数据
│   ├── {case_type}/
│   │   └── traj_NNNN.h5    ← 50 files per type (traj_0000.h5 - traj_0049.h5)
│   └── ...
├── scripts/                ← Processing & viz scripts / 后处理与可视化脚本
│   ├── postprocess_to_hdf5.py   ← OpenFOAM → HDF5 conversion
│   ├── visualize_hdf5.py        ← HDF5 → PNG visualization
│   ├── foam_viz.py              ← OpenFOAM field visualization
│   ├── viz_common.py            ← Shared visualization utilities
│   ├── gen_init_conditions.py   ← Random initial condition generator
│   ├── run_droplet_loop.sh      ← droplet_impact batch runner
│   ├── run_stokes_loop.sh       ← stokes_wave batch runner
│   └── run_postprocess_all.sh   ← HDF5 postprocessing wrapper
└── visualizations/         ← Visualization outputs / 可视化输出
    ├── arrow/              ← Velocity arrow plots (4 cases × foam+hdf5)
    └── streamline/         ← Streamline plots (4 cases × foam+hdf5)

HDF5 Format / HDF5 格式

Each traj_NNNN.h5 contains:

Dataset	Shape	Type	Description / 描述
u	(n_frames, nx, ny)	float32	X-velocity / X 方向速度
v	(n_frames, nx, ny)	float32	Y-velocity / Y 方向速度
p	(n_frames, nx, ny)	float32	Pressure (p_rgh) / 压力
alpha	(n_frames, nx, ny)	float32	Water volume fraction / 水相分数
x_grid	(nx, ny)	float64	X-coordinate mesh / X 坐标网格
y_grid	(nx, ny)	float64	Y-coordinate mesh / Y 坐标网格

Attributes / 属性: nx, ny, n_saved, times, case_name, mesh_Lx, mesh_Ly

Case Types / 案例类型

Case Type	Mesh	Domain (m)	Physics / 物理场景
dam_break	128×128	0.584×0.584	2D dam break / 溃坝
rising_bubble	128×256	1.0×2.0	Buoyancy-driven bubble / 气泡上升
stokes_wave	256×128	varies	Surface gravity wave / 表面重力波
droplet_impact	128×128	0.05×0.05	Droplet impact / 液滴撞击壁面

Simulation Config / 仿真配置

• Solver: OpenFOAM v1906 (Foundation) interFoam
• Parallel: MPI 16 processes, 2D hierarchical decomposition (n×n×1)
• Adaptive dt: maxCo=0.5, maxAlphaCo=0.5, maxDeltaT=1e-4
• Random ICs: generated by gen_init_conditions.py with per-type parameter ranges

Reproducibility / 可复现性

Each trajectory's initial conditions are embedded in its 0/U, 0/alpha.water, and 0/p_rgh files. To reproduce:

# Reconstruct and visualize a single case / 重建并可视化单个 case
cd raw/{case_type}/t00
blockMesh && decomposePar -force
mpirun -np 16 interFoam -parallel
reconstructPar -latestTime