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.
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:
hf download DingDong1921/openlb-multigeometry-flow \
--repo-type dataset \
--local-dir openlb-multigeometry-flow
Download one split:
hf download DingDong1921/openlb-multigeometry-flow \
--repo-type dataset \
--include "data/test/*" \
--local-dir openlb-multigeometry-flow
Inspect one trajectory after download:
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 |
| Triangle |  |
GIF |
| Rectangle |  |
GIF |
| Pentagon |  |
GIF |
| Smooth star |  |
GIF |
| Irregular |  |
GIF |
| Bunny |  |
GIF |
| Elephant |  |
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. 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.