---
license: cc-by-nc-4.0
tags:
- CFD
- Multiphase
- CompressibleFlow
- SciML
- Shock
- Droplets
pretty_name: 2D Shock-Induced Droplet Breakup in Air
size_categories:
- 10K<n<100K
---

# 2D Shock-Induced Droplet Breakup in Air
## Description

The dataset captures the time-evolving behavior of 2D cylindrical droplets subjected to an external shock wave in air.
The interaction with the shock wave results in two different breakup modes namely SIE and RTP depending on the weber number. 
Here we investigate a scenario with symmetric boundary conditions at the north and south walls.

<div style="display:flex;justify-content:center;gap:20px;flex-wrap: wrap;">
  <video style="width:100%;max-width:400px" src="https://huggingface.co/datasets/FluidVerse/2D_SDBA_SSOO/resolve/main/SDBA_SSOO_SIE_Mas1.20.mp4" loop autoplay muted></video>
  <video style="width:100%;max-width:400px" src="https://huggingface.co/datasets/FluidVerse/2D_SDBA_SSOO/resolve/main/SDBA_SSOO_RTP_Mas2.00.mp4" loop autoplay muted></video>
</div>

## About the data
|Metadata|Description|
|-----|------|
|Solver|[ALPACA](https://www.sciencedirect.com/science/article/abs/pii/S0010465521003581)|
|PDE|2D compressible Euler equations|
|Dimension|2D|
|Number of Trajectories|300|
|Train-Test-Split|0.8 - 0.2|
|Number of Timesteps|101|
|Simulation End Time|91 \\( \mu s \\) - 1240 \\( \mu s \\) (depending on the IC)|
|Save Interval|0.91 \\( \mu s \\) - 12.40 \\( \mu s \\) (depending on the IC)|
|Fields| - density_mixed <br/> - density_water <br/> - density_air <br/> - pressure <br/> - velocityX <br/> - velocityY <br/> - volume_fraction_water|
|Simulation Resolution|1024x512 (Clipped and Downsampled)|
|Dataset Resolution|512x512 & 256x256|
|Grid Type|Cartesian Uniform Grid|
|Initial Condition|The droplets are in equilibrium with the surrounding pre-shock environment.|
|Boundary Conditions| North: Symmetry <br/> South: Symmetry <br/> East: Open <br/> West: Open|
|Conditioning Parameters| Shock Mach Number [1.2 - 3.2] <br/> Weber Number [10 - 30 & 10k - 30k] <br/> Droplet Count [1 - 5] <br/> Droplet Radius [2mm - 3.5mm] <br/> Droplet Center Position [Random in Domain]

Further metadata information can be found in the corresponding `metadata.json` file.

## Key Challenges for Surrogate Modelling
- Distinguish breakup mode - RTP or SIE
- Accurate interface capturing
- Understanding wave dynamics
- Tracking droplet fragments
- Capture droplet interactions in the case of multi-droplets

## How to Download the Dataset

Download the whole dataset:
```
hf download FluidVerse/2D_SDBA_SSOO --repo-type dataset
```

Download only part of the dataset with resolution 256x256:
```
from huggingface_hub import snapshot_download

snapshot_download(
    repo_id="FluidVerse/2D_SDBA_SSOO",
    repo_type="dataset",
    allow_patterns="multi_droplet/256x256/*",
    local_dir="."
)
```