Precomputed results of a 2D dam break with 1M through 82M particles publicly available

We recently published 735 GB worth of precomputed, high-resolution SPH flow fields. They regard simulations of a 2D dam break impinging against a vertical wall, a benchmark used throughout much CFD literature. Relying on the hardware-acceleration capabilities of DualSPHysics 5.0, we resolved the initial water column with 800, 1600, 3200 and 6400 particles.

Therefore, we are pleased to share with all interested the flow fields of velocity, density and particle identification number for 1, 5, 20 and 82M particles, in both bi4 and vtk format. The playlist previews the contents.

We wanted to make it possible for scholars/practitioners/educators/novices to look critically and/or creatively at the end results of highly resolved SPH simulations. Obtaining such datasets can be either difficult, impractical or unaffordable for many. In this respect, the policy at the Delft University of Technology encourages implementing the FAIR principle for all research productions --- FAIR stands for findable, accessible, interoperable, reusable [*]. Since DualSPHysics is open-source software, it is natural and possible to produce with it open data in a spirit of open science (and engineering).

This collection regards an established benchmark. Data could be used, for example, for (a) educational support; (b) initial conditions for refined/extended `hot starts'; (c) test input for software development, visualisation exercises and data exploration; (d) sensitivity studies to numerical parameters/methods; (e) comparisons with other solvers and methodologies; (f) evaluating how much you miss when you stop at a lower resolution; (g) own study and delight; and so on. Certainly, the DualSPHysics community is in an advantaged position to explore those datasets.

The data are grouped into a collection of five datasets totalling 1650 separate files. We decided to share so many files separately, so that users can download and explore subsets at the smallest overhead for their broadband. To this end, we also distribute the snapshots of each available flow field; you can then preview and pick up from the collection the precomputed results you like best.

Importantly, a commentary in PDF format explains motivation, methods, tools and, more importantly, the organisation of the collection; that commentary is definitely the recommended entry point for using the collection.

The data library of the 4TU.DataResearch centre in the Netherlands distributes this DOI-indexed collection of datasets under a CC-BY license from We hope that this effort will be a useful resource for the DualSPHysics community too.

If you see value in a broader circulation of this initiative, please spread the news. A tweet, de rigueur in the SPH community, is available from

Thank you all for reading this.

Giordano Lipari and Kees Vuik

Sign In or Register to comment.