Compute the surface tension force at the fluid interface.
Note that this is an experimental feature and is probably far from physically correct.
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 curvature | Field storing the curvature at the interface barycenter. | Scalar | Cell-based |
The following parameters can be set by the user:
| Parameter | Description | Type | Accepted values | Default value |
|---|---|---|---|---|
| Coefficient | Surface tension coefficient based on the involved species. | Float | >0 | 72.75 |
| Density | Density of the liquid phase. | Float | >0 | 0.9982 |
| Time step | Alternative time step for scaling the surface tension force vectors. If set to zero, use time step derived from the dataset. | Float | ≥0 | 0.0 |
The following data fields are appended to the input grid:
| Data field | Description | Data | Type | Remark |
|---|---|---|---|---|
| Surface tension force | Approximate surface tension force in interface cells. | Vector | 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.