Extract droplets, defined as area of non-zero values in the volume of fluid (VOF) field. Additionally, properties such as volume and average velocity are calculated.
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 | |
| Fluid positions | Representative positions in cells containing the fluid phase. | Vector | Cell-based | |
| Velocities | Velocity field describing the fluid flow. | Vector | Cell-based | Optional |
The following parameters can be set by the user:
| Parameter | Description | Type | Accepted values | Default value |
|---|---|---|---|---|
| Calculate translation | Calculate the average velocity for each droplet. | Boolean | False | |
| Calculate rotation | Calculate the rotation of the droplet, assuming rigid-body dynamics. | Boolean | False | |
| Calculate energy | Calculate the energy related to droplet movement. | Boolean | False | |
| Calculate inertia | Calculate the inertia tensor for the droplet | Boolean | False | |
| Inertia scaling | Scale the inertia vectors (see output below) for visualization output by normalizing, eigenvalue, or logarithm of the eigenvalue. | Enumeration | Normalized, Eigenvalue, Log of Eigenvalue | Normalized |
| Method for rotation computation | Method for rotation computation: fluid mechanics, velocities, or PCA. | Enumeration | Mechanics, Velocities, PCA | Mechanics |
The following output ports are available:
| Input | Description | Type | Remark |
|---|---|---|---|
| Grid | A copy of the input grid. | Rectilinear Grid | |
| Positions | A set of points representing the center of mass of the droplets. | Polydata |
The following data fields are appended to the input grid:
| Data field | Description | Data | Type | Remark |
|---|---|---|---|---|
| Droplet ID | Assigned ID of the droplet, to match grid and positions. | Scalar | Cell-based | |
| Volume | Volume of the droplet. | Scalar | Cell-based |
The grid itself is not modified.
The following data fields are appended to the positions:
| Data field | Description | Data | Type | Remark |
|---|---|---|---|---|
| Droplet ID | Assigned ID of the droplet, to match grid and positions. | Scalar | Point-based | |
| Volume | Volume of the droplet. | Scalar | Point-based | |
| Radius | Representative radius of the droplet for visualization. | Scalar | Point-based | |
| Translation | Average velocity of the droplet. | Vector | Point-based | Requires velocities. Translation computation must be enabled. |
| Translation energy | Kinetic energy of the average droplet velocity. | Scalar | Point-based | Requires velocities. Translation, and energy computation must be enabled. |
| Rotation | Scaled rotation axis, defining the rotation of the droplet. | Vector | Point-based | Requires velocities. Rotation computation must be enabled. |
| Rotation energy | Kinetic energy of the droplet rotation. | Scalar | Point-based | Requires velocities. Rotation, and energy computation must be enabled. |
| Local energy | Internal energy of the droplet, which is defined as the total energy subtracting translation and rotation energy. | Scalar | Point-based | Requires velocities. Translation, rotation, and energy computation must be enabled. |
| Energy | Total energy of the droplet, defined as kinetic energy of the input vector field. | Scalar | Point-based | Requires velocities. Energy computation must be enabled. |
| Inertia | Inertia tensor for the droplet. | Matrix | Point-based | Requires velocities. Inertia computation must be enabled. |
| Inertia #1 | First eigenvector of the inertia tensor, scaled by its corresponding eigenvalue according to the scaling method. | Vector | Point-based | Requires velocities. Inertia computation, and detailed output must be enabled. |
| Inertia #2 | Second eigenvector of the inertia tensor, scaled by its corresponding eigenvalue according to the scaling method. | Vector | Point-based | Requires velocities. Inertia computation, and detailed output must be enabled. |
| Inertia #3 | Third eigenvector of the inertia tensor, scaled by its corresponding eigenvalue according to the scaling method. | Vector | Point-based | Requires velocities. Inertia computation, and detailed output must be enabled. |