| --- |
| license: cc-by-nc-4.0 |
| tags: |
| - CFD |
| - Multiphase |
| - CompressibleFlow |
| - SciML |
| - Droplets |
| - Shock |
| - 3D |
| pretty_name: 3D Shock-Induced Droplet Breakup in Air with Symmetric BC |
| size_categories: |
| - 1K<n<10K |
| --- |
| |
| # 3D Shock-Induced Droplet Breakup in Air with Symmetric BC |
| ## Description |
|
|
| The dataset captures the time-evolving behavior of 3D spherical droplets subjected to an external shock wave in air. |
| When a shock wave impacts a droplet, the initial response—largely independent of the Weber number—is a deformation phase in which the droplet flattens. |
| This interaction with the shock wave results in two different breakup-modes of the droplet (SIE and RTP). |
| In the SIE regime, breakup is driven mainly by strong shear forces acting along the droplet surface. |
| After the droplet has flattened, shear-induced disturbances emerge near the equator; these instabilities originate near the droplet equator after the droplet has flattened out in the first phase and are advected along the droplet surface. |
| As the relative velocity between the droplet and the surrounding gas increases, these disturbances grow due to Kelvin–Helmholtz instability, eventually stripping liquid from the droplet and producing fine droplets downstream. |
| In contrast, in the RTP regime, relatively stronger surface tension suppresses the growth of such shear instabilities, maintaining a smoother interface. |
| As deformation progresses, the upstream side of the droplet becomes concave as the surrounding gas penetrates and pierces the liquid. |
| Unlike RTP, the SIE regime is characterized by a continuous and gradual loss of mass, often resulting in a mist of droplets downstream. |
| Here we investigate a scenario with symmetric boundary conditions at the north, south, top and bottom walls. |
|
|
| <div style="display:flex;justify-content:center;gap:20px;flex-wrap: wrap;"> |
| <div> |
| <video style="width:100%;max-width:800px" src="https://huggingface.co/datasets/FluidVerse/3D_SDBA_SSOOSS/resolve/main/SDBA_SSOOSS_RTP_Mas1.20.mp4" loop autoplay muted controls></video> |
| <p style="position:relative;top:-30px;font-size:14px">Shock-Induced Droplet RTP-Breakup in Air (Mach 1.20)</p> |
| </div> |
| <div> |
| <video style="width:100%;max-width:800px" src="https://huggingface.co/datasets/FluidVerse/3D_SDBA_SSOOSS/resolve/main/SDBA_SSOOSS_SIE_Mas1.20.mp4" loop autoplay muted controls></video> |
| <p style="position:relative;top:-30px;font-size:14px">Shock-Induced Droplet SIE-Breakup in Air (Mach 1.20)</p> |
| </div> |
| </div> |
| |
| ## About the data |
| |Metadata|Description| |
| |-----|------| |
| |Solver|[ALPACA](https://www.sciencedirect.com/science/article/abs/pii/S0010465521003581)| |
| |PDE|3D compressible Euler equations| |
| |Dimension|3D| |
| |Number of Trajectories|180| |
| |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/> - velocityZ <br/> - volume_fraction_water| |
| |Simulation Resolution|256x128x128 (Clipped and Downsampled)| |
| |Dataset Resolution|128x128x128| |
| |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/> Top: Symmetry <br/> Bottom: 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 and channel-wise statistics can be found in the corresponding `metadata.json` file. |
| |
| ## Dataset Structure |
| The train.h5 and test.h5 in this repository are meta hdf5 files that link to multiple subparts inside the corresponding subset folder. |
| The mentioned train-test-split [0.8 - 0.2] is only valid when all subparts inside the subset folder are present. |
| |
| ## 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/3D_SDBA_SSOOSS --repo-type dataset |
| ``` |
| |
| Download only part of the dataset with resolution 128x128x128: |
| ``` |
| from huggingface_hub import snapshot_download |
| |
| snapshot_download( |
| repo_id="FluidVerse/3D_SDBA_SSOOSS", |
| repo_type="dataset", |
| allow_patterns="3d_shock_multi_droplet_breakup_in_air/128x128x128/Shock_Droplet_mixed_DPUVWD1D2Vf/*", |
| local_dir="." |
| ) |
| ``` |
