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README.md
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# NS Simulation Dataset — 3D Driven Turbulence (128³)
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## Overview
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This dataset contains output from a 3D isothermal hydrodynamic driven turbulence simulation run with [AthenaK](https://github.com/PrincetonUniversity/athenak). The simulation models subsonic turbulence driven on large scales in a periodic box.
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## Simulation Parameters
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| Parameter | Value |
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|---|---|
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| Code | AthenaK |
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| Problem | 3D driven turbulence |
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| Grid resolution | 128 × 128 × 128 |
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| Domain | [-0.5, 0.5]³ (unit box) |
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| Boundary conditions | Periodic (all faces) |
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| EOS | Isothermal |
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| Isothermal sound speed | 5.0 |
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| Time integrator | RK2 |
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| CFL number | 0.3 |
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| Spatial reconstruction | PLM |
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| Riemann solver | HLLE |
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## Turbulence Driving
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| Parameter | Value |
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|---|---|
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| Driving type | Driven (continuously forced) |
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| Energy injection rate (`dedt`) | 1×10⁻⁴ |
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| Correlation time (`tcorr`) | 5.0 |
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| Driving wavenumber range | nlow=1, nhigh=3 (peak at n=2) |
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| Spectral form | Parabolic |
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| Driving mode | Purely solenoidal (sol_fraction=1.0) |
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## Files
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- **Format:** Legacy VTK binary (`DATASET STRUCTURED_POINTS`)
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- **Naming:** `Turb.hydro_w.NNNNN.vtk` where `NNNNN` is the output index
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- **Total files:** 1001 snapshots (indices 18903–19903)
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- **Time range:** t ≈ 189.03 to 199.03 (output cadence Δt = 0.01)
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- **Grid size per file:** 128³ = 2,097,152 cells
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## Data Fields (per file)
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Each VTK file contains the following cell-centred scalar fields:
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| Field name | Description |
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|---|---|
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| `dens` | Mass density ρ |
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| `velx` | Velocity component v_x |
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| `vely` | Velocity component v_y |
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| `velz` | Velocity component v_z |
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| `s_00` | Passive scalar (tracer) |
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## Reading the Data
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The files are standard VTK legacy binary format and can be read with [ParaView](https://www.paraview.org/), [VisIt](https://visit-dav.github.io/visit-website/), or Python via `vtk` or `pyvista`:
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```python
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import pyvista as pv
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mesh = pv.read("Turb.hydro_w.18903.vtk")
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density = mesh["dens"].reshape(128, 128, 128)
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velx = mesh["velx"].reshape(128, 128, 128)
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```
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