README
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Dataset title:
[Data from Lagrangian particle tracking of flow around a cube at varying relative submergence]

Recommended Citation:
[Nilsson, D. (2026). Data from Lagrangian particle tracking of flow around a cube at varying relative submergence (Version 1) [Data set]. Luleå University of Technology. https://doi.org/10.5878/a2am-hn92]
See the Researchdata.se catalogue entry for this dataset - accessible via the DOI link above - for compete metadata, including the dataset description, contact information and information about how to obtain the dataset.

Responsible organization:
[Luleå University of Technology]

Description: [3D Lagrangian particle tracking dataset of flow around a surface-mounted cube in an open-channel flume at two relative submergence conditions. Particle tracks were reconstructed using Shake-The-Box and used to obtain Eulerian velocity fields.]

License: [CC-BY 4.0] 

Essential information for dataset reuse.
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The dataset contains 3D Lagrangian particle tracking (LPT) measurements of flow around a bottom-mounted cube in a 7.5 m open-channel flume (0.30 × 0.30 m cross section). Experiments were conducted for two relative submergence conditions (RS = 1.25 and RS = 2.00) with freestream velocities of 0.32 m/s and 0.28 m/s, respectively. Flow images were acquired using a four-camera volumetric imaging system at 200 Hz for 22.5 s, with neutrally buoyant tracer particles (125–150 μm). Three-dimensional particle tracks were obtained using the Shake-The-Box (STB) algorithm. The resulting Lagrangian trajectories were interpolated onto Eulerian grids in 3D binns of 30 × 30 × 30 voxels with an 83.33% overlap, resulting in a grid size of 1.2 mm. Full experimental and processing details are provided in the associated manuscript.

Dataset organization    / Datafile descriptions
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The dataset provides time- averaged velocity and acceleration fields for two relative submergence conditions: Low (RS = 1.25) and High (RS = 2.00). Velocity and acceleration data are stored in separate files. In each file, columns 1–3 contain the spatial grid coordinates (x, y, z in mm), and columns 4–6 contain the corresponding flow components (u, v, w in m/s for velocity files, ax, ay, az in m/s² for acceleration files). Each row represents a single grid point in the reconstructed Eulerian field.

Low/
  uvw_125.csv        – Velocity field (u, v, w)
  acc_uvw_125.csv    – Acceleration field (ax, ay, az)

High_RS200/
  uvw_2.csv	       – Velocity field (u, v, w)
  acc_uvw_2.txt        – Acceleration field (ax, ay, az)



Time-resolved data can be distributed upon resonable request.