GROUND TRUTH LAYER

OpenFOAM CFD Data

The common physical source for every current U-sweep model test. The website keeps this layer separate so representation and dynamics methods can be compared without silently changing the CFD evidence underneath them.

ACCEPTED SOURCESeven U-sweep cases · canonical HDF5 available

CURRENT DATASET

One geometry, seven speeds, one controlled source contract

7speed cases50, 75, 100, 125, 150, 175, 200 km/h

12°fixed AoAcurrent U-sweep branch

640snapshots / speed10 cycles × 64 nominal samples

96,000volume cellscommon reconstructed ordering

840wall facessurface pressure / shear

ORIGINAL CFD REFERENCE

Force histories and instantaneous flow field · case by case

Each row keeps one OpenFOAM speed case together: the original Cd/Cl history on the left and one instantaneous velocity-magnitude field on the right. Force histories use the retained CFD values directly. The contour uses snapshot 320 (cycle 5, nominal phase index 0), also directly from the retained CFD field. No POD, phase averaging or ROM reconstruction is involved.

U050

50 km/h

AoA 12° · 640 retained CFD snapshots · contour: snapshot 320, source time 14.10128

Instantaneous OpenFOAM velocity magnitude contour at 50 km/h — Instantaneous velocity magnitude |U| · snapshot 320

U075

75 km/h

AoA 12° · 640 retained CFD snapshots · contour: snapshot 320, source time 10.36909

Instantaneous OpenFOAM velocity magnitude contour at 75 km/h — Instantaneous velocity magnitude |U| · snapshot 320

U100

100 km/h

AoA 12° · 640 retained CFD snapshots · contour: snapshot 320, source time 10.02516

Instantaneous OpenFOAM velocity magnitude contour at 100 km/h — Instantaneous velocity magnitude |U| · snapshot 320

U125

125 km/h

AoA 12° · 640 retained CFD snapshots · contour: snapshot 320, source time 7.44890

Instantaneous OpenFOAM velocity magnitude contour at 125 km/h — Instantaneous velocity magnitude |U| · snapshot 320

U150

150 km/h

AoA 12° · 640 retained CFD snapshots · contour: snapshot 320, source time 6.96384

Instantaneous OpenFOAM velocity magnitude contour at 150 km/h — Instantaneous velocity magnitude |U| · snapshot 320

U175

175 km/h

AoA 12° · 640 retained CFD snapshots · contour: snapshot 320, source time 7.02932

Instantaneous OpenFOAM velocity magnitude contour at 175 km/h — Instantaneous velocity magnitude |U| · snapshot 320

U200

200 km/h

AoA 12° · 640 retained CFD snapshots · contour: snapshot 320, source time 4.35675

Instantaneous OpenFOAM velocity magnitude contour at 200 km/h — Instantaneous velocity magnitude |U| · snapshot 320

DATA PIPELINE

OpenFOAM → canonical HDF5 → parallel model tests

01Transient OpenFOAMaccepted CFD solution archives

→

02Reconstruct orderingconsistent volume / wall geometry

→

03Canonical HDF5one file per speed

→

04Model testsRaw POD · Phase/Residual · SPOD · SINDy

Volume fields

U, p, k, ω, νt

The current ROM tests primarily use u, w, pressure and ω, with physical cell-volume weighting where appropriate.

Surface fields

p + wall shear

Surface quantities support pressure/shear reconstruction and derived Cd/Cl rather than fitting force histories as unrelated scalars.

Geometry

Stored once per case

Cell centers, cell volumes, wall centers and wall-area vectors define the consistent reconstruction space.

Policy

CFD remains ground truth

The surrogate methods are evaluated against this source. The public website does not ship the raw CFD/HDF5 dataset.

NEXT DATA LAYERS

The same contract extends to broader parameter space

AoA Sweep

Add angle-of-attack variation and explicitly test whether one dynamics assumption still holds across changing separation regimes.

FUTURE

U × AoA Full Sweep

Combine both one-dimensional branches into a joint operating map with genuinely off-grid validation conditions.