The dataset viewer is not available for this split.
Error code: StreamingRowsError
Exception: ValueError
Message: Dataset 'cells' has length 6658 but expected 3461
Traceback: Traceback (most recent call last):
File "/src/services/worker/src/worker/utils.py", line 147, in get_rows_or_raise
return get_rows(
dataset=dataset,
...<4 lines>...
column_names=column_names,
)
File "/src/libs/libcommon/src/libcommon/utils.py", line 272, in decorator
return func(*args, **kwargs)
File "/src/services/worker/src/worker/utils.py", line 127, in get_rows
rows_plus_one = list(itertools.islice(safe_iter(ds, dataset=dataset), rows_max_number + 1))
File "/src/services/worker/src/worker/utils.py", line 483, in safe_iter
yield from ds.decode(False) if ds.features else ds
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2840, in __iter__
for key, example in ex_iterable:
^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2373, in __iter__
for key, pa_table in self._iter_arrow():
~~~~~~~~~~~~~~~~^^
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 2398, in _iter_arrow
for key, pa_table in self.ex_iterable._iter_arrow():
~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 536, in _iter_arrow
for key, pa_table in iterator:
^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/datasets/iterable_dataset.py", line 419, in _iter_arrow
for key, pa_table in self.generate_tables_fn(**gen_kwags):
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/hdf5/hdf5.py", line 76, in _generate_tables
num_rows = _check_dataset_lengths(h5, self.info.features)
File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/hdf5/hdf5.py", line 355, in _check_dataset_lengths
raise ValueError(f"Dataset '{path}' has length {dset.shape[0]} but expected {num_rows}")
ValueError: Dataset 'cells' has length 6658 but expected 3461Need help to make the dataset viewer work? Make sure to review how to configure the dataset viewer, and open a discussion for direct support.
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.
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