| --- |
| license: cc-by-4.0 |
| task_categories: |
| - time-series-forecasting |
| size_categories: |
| - n<1K |
| tags: |
| - computational-fluid-dynamics |
| - graph-neural-networks |
| - unstructured-mesh |
| - openlb |
| - hdf5 |
| pretty_name: OpenLB MultiGeometry Flow 456 |
| --- |
| |
| # OpenLB MultiGeometry Flow 456 |
|
|
| OpenLB MultiGeometry Flow 456 is an openly available collection of 456 |
| independent two-dimensional unsteady-flow trajectories around eight obstacle |
| families on variable triangular meshes. It is created and maintained by |
| [`DingDong1921`](https://huggingface.co/DingDong1921). |
|
|
| ## Scale and splits |
|
|
| - 408 train, 24 validation, and 24 test trajectories. |
| - 57 trajectories for each of eight families: ellipse, triangle, rectangle, |
| pentagon, smooth star, irregular, bunny, and elephant. |
| - 601 frames per trajectory over dimensionless time `0:0.1:60`. |
| - 2,831--4,365 |
| mesh nodes per trajectory (mean 3580.2). |
| - 28.774 GiB of HDF5 payload. |
| - Reynolds numbers 500--1000 in increments of 50. |
| - Channels `(u, v, p)`: two velocity components and recovered |
| density-normalized specific pressure. |
|
|
| The three splits are predefined for reproducible comparisons. Test files are |
| publicly accessible, so this is a conventional held-out split rather than a |
| secret benchmark. When reporting a clean test result, choose methods and |
| hyperparameters using only train and validation data. |
|
|
| All eight geometry families occur in training. The supplied split supports |
| within-family geometry/parameter generalization studies; it does not establish |
| unseen-family generalization. |
|
|
| ## Download |
|
|
| Download the complete dataset: |
|
|
| ```bash |
| hf download DingDong1921/openlb-multigeometry-flow \ |
| --repo-type dataset \ |
| --local-dir openlb-multigeometry-flow |
| ``` |
|
|
| Download one split: |
|
|
| ```bash |
| hf download DingDong1921/openlb-multigeometry-flow \ |
| --repo-type dataset \ |
| --include "data/test/*" \ |
| --local-dir openlb-multigeometry-flow |
| ``` |
|
|
| Inspect one trajectory after download: |
|
|
| ```bash |
| python examples/load_one_case.py data/train/ellipse_00.h5 --frame 0 |
| ``` |
|
|
| See `metadata/schema.md`, `metadata/provenance.md`, and |
| `metadata/cases.jsonl` before constructing a loader. Each manifest row records |
| the split, geometry, physical/numerical parameters, source-code identities, |
| file size, and SHA-256 identity. |
|
|
| ## Representative previews |
|
|
| | Family | Shared-scale frame at `t*=30` | Full trajectory | |
| | --- | --- | --- | |
| | Ellipse |  | [GIF](previews/ellipse_00_speed_pressure.gif) | |
| | Triangle |  | [GIF](previews/triangle_00_speed_pressure.gif) | |
| | Rectangle |  | [GIF](previews/rectangle_00_speed_pressure.gif) | |
| | Pentagon |  | [GIF](previews/pentagon_00_speed_pressure.gif) | |
| | Smooth star |  | [GIF](previews/smooth_star_00_speed_pressure.gif) | |
| | Irregular |  | [GIF](previews/irregular_00_speed_pressure.gif) | |
| | Bunny |  | [GIF](previews/bunny_00_speed_pressure.gif) | |
| | Elephant |  | [GIF](previews/elephant_00_speed_pressure.gif) | |
|
|
| ## Numerical semantics and limitations |
|
|
| - Solver: OpenLB 1.9.0, D2Q9/TRT, cold start, fifth-order inlet/farfield ramp, |
| convection outlet, and no-slip obstacle wall. |
| - Pressure is reconstructed from the unsteady Navier--Stokes relation and fixed |
| to zero at the right outlet. It is not a direct raw LBM pressure field. |
| - The inlet/farfield ramp ends at dimensionless time `t*=15.025`; early windows |
| should not be treated as stationary-boundary data. |
| - The data are generated by OpenLB and are not interchangeable with Nektar++ |
| trajectories without a matched-semantics comparison. |
| - Representative images are navigation aids. Visual plausibility alone does |
| not establish physical correctness. |
|
|
| ## License and attribution |
|
|
| The generated dataset payload, dataset-specific metadata, documentation, and |
| previews are released under |
| [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/). Cite or attribute |
| the dataset to `DingDong1921` and link this repository. OpenLB, DGN4CFD, and |
| source geometry assets retain their own licenses and are acknowledged in |
| `metadata/provenance.md`. |
|
|
