Calculate the curvature of the interface using the method by Popinet [1], which uses a height-based approach in the volume of fluid (VOF) field, with a fallback on parabola-fitting in degenerate cases.
The following input ports are available:
| Input | Description | Type | Remark |
|---|---|---|---|
| Grid | Grid containing fields representing fluids in a multiphase setting. | Rectilinear Grid |
The grid contains the following data fields:
| Data field | Description | Data | Type | Remark |
|---|---|---|---|---|
| Volume of fluid field | A volume of fluid field, whose entries are in the range [0, 1]. | Scalar | Cell-based | |
| Interface gradients | Gradients in interface cells. | Vector | Cell-based | |
| Interface positions | Field containing the interface barycenter of each interface cell. | Vector | Cell-based |
The following data fields are appended to the input grid:
| Data field | Description | Data | Type | Remark |
|---|---|---|---|---|
| Interface curvature | The curvature at the interface barycenter. | Scalar | Cell-based |
The grid itself is not modified.
[1] Stéphane Popinet. An accurate adaptive solver for surface-tension-driven interfacial flows. Journal of Computational Physics, 228(16): 5838–5866, 2009.