| --- |
| license: cc-by-sa-4.0 |
| pretty_name: Double-Delta (processed) |
| tags: [cfd, aerodynamics, point-cloud, physics, surrogate-modeling] |
| size_categories: [10B<n<100B] |
| --- |
| |
| # Double-Delta (processed) |
|
|
| This is a processed, downsampled version of Double-Delta, not the original dataset. |
| Fields were converted to a common frame and non-dimensionalized, rows were randomly subsampled and some variables were dropped. |
| For the original data, see the original [paper](https://arxiv.org/abs/2512.20941). For dataloaders and processing details please see our [paper](https://arxiv.org/abs/2610.10398v1), or [Github](https://github.com/anthonyzhou-1/cross_domain_cfd/tree/main). |
|
|
| The original size was 0.23 TB, therefore there was no downsampling done for this dataset. |
|
|
| ## Layout |
|
|
| ``` |
| collated/ surface |
| manifest.json [{stem, n_points, n_points_source, ...}] |
| splits/{train,val}.json |
| norm_stats*.npz per-column normalization statistics |
| samples/<stem>.npy |
| volume_collated/ volume |
| manifest.json |
| norm_stats_volume*.npz |
| samples/<stem>.npy |
| RELEASE.json downsampling factors, columns and row totals |
| ``` |
|
|
| ## Columns |
|
|
| **Surface** (`collated`, 14 columns): |
|
|
| | col | name | meaning | |
| |---|---|---| |
| | 0 | `x` | position | |
| | 1 | `y` | position | |
| | 2 | `z` | position | |
| | 3 | `cp` | pressure coefficient | |
| | 4 | `cf_x` | skin-friction coefficient | |
| | 5 | `cf_y` | skin-friction coefficient | |
| | 6 | `cf_z` | skin-friction coefficient | |
| | 7 | `n_x` | outward normal | |
| | 8 | `n_y` | outward normal | |
| | 9 | `n_z` | outward normal | |
| | 10 | `area` | surface element area | |
| | 11 | `yPlus` | wall y+ | |
| | 12 | `rho_tilde` | density / freestream density | |
| | 13 | `t_tilde` | temperature / freestream temperature | |
|
|
| **Volume** (`volume_collated`, 9 columns): |
|
|
| | col | name | meaning | |
| |---|---|---| |
| | 0 | `x` | position | |
| | 1 | `y` | position | |
| | 2 | `z` | position | |
| | 3 | `ux` | velocity | |
| | 4 | `uy` | velocity | |
| | 5 | `uz` | velocity | |
| | 6 | `cp` | pressure coefficient | |
| | 7 | `rho_tilde` | density / freestream density | |
| | 8 | `t_tilde` | temperature / freestream temperature | |
|
|
| ## Splits |
|
|
| The volume tree uses the surface splits (keyed by stem). |
|
|
| - `train`: 2,304 samples |
| - `val`: 144 samples |
|
|
|
|
| Either use norm_stats_centered.npz, or norm_stats_thinned.npz. The centered stats are computed on the simulation mesh (i.e., native discretization), while the thinned stats are computed after (roughly) uniform sampling. |
|
|
