| --- |
| license: mit |
| task_categories: |
| - other |
| tags: |
| - physics |
| - fluid-dynamics |
| - turbulence |
| - simulation |
| - vtk |
| pretty_name: 3D Driven Turbulence Simulation (128³) |
| size_categories: |
| - 10G<n<100G |
| configs: |
| - config_name: default |
| data_files: |
| - files_index.csv |
| --- |
| |
| # NS Simulation Dataset — 3D Driven Turbulence (128³) |
|
|
| ## Overview |
|
|
| 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. |
|
|
| ## Simulation Parameters |
|
|
| | Parameter | Value | |
| |---|---| |
| | Code | AthenaK | |
| | Problem | 3D driven turbulence | |
| | Grid resolution | 128 × 128 × 128 | |
| | Domain | [-0.5, 0.5]³ (unit box) | |
| | Boundary conditions | Periodic (all faces) | |
| | EOS | Isothermal | |
| | Isothermal sound speed | 5.0 | |
| | Time integrator | RK2 | |
| | CFL number | 0.3 | |
| | Spatial reconstruction | PLM | |
| | Riemann solver | HLLE | |
|
|
| ## Turbulence Driving |
|
|
| | Parameter | Value | |
| |---|---| |
| | Driving type | Driven (continuously forced) | |
| | Energy injection rate (`dedt`) | 1×10⁻⁴ | |
| | Correlation time (`tcorr`) | 5.0 | |
| | Driving wavenumber range | nlow=1, nhigh=3 (peak at n=2) | |
| | Spectral form | Parabolic | |
| | Driving mode | Purely solenoidal (sol_fraction=1.0) | |
| |
| ## Files |
| |
| - **Format:** Legacy VTK binary (`DATASET STRUCTURED_POINTS`) |
| - **Naming:** `Turb.hydro_w.NNNNN.vtk` where `NNNNN` is the output index |
| - **Total files:** 1001 snapshots (indices 18903–19903) |
| - **Time range:** t ≈ 189.03 to 199.03 (output cadence Δt = 0.01) |
| - **Grid size per file:** 128³ = 2,097,152 cells |
|
|
| ## Data Fields (per file) |
|
|
| Each VTK file contains the following cell-centred scalar fields: |
|
|
| | Field name | Description | |
| |---|---| |
| | `dens` | Mass density ρ | |
| | `velx` | Velocity component v_x | |
| | `vely` | Velocity component v_y | |
| | `velz` | Velocity component v_z | |
| | `s_00` | Passive scalar (tracer) | |
|
|
| ## Reading the Data |
|
|
| 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`: |
|
|
| ```python |
| import pyvista as pv |
| |
| mesh = pv.read("Turb.hydro_w.18903.vtk") |
| density = mesh["dens"].reshape(128, 128, 128) |
| velx = mesh["velx"].reshape(128, 128, 128) |
| ``` |
|
|
