Fluid 2D Affector
Updated: 15 Sep 2026
Applies a fluid simulation to a field.
Fluid 2D Affector
Method #
This node applies a fluid solver to the velocities of the field system, creating eddies and swirls like a gas or liquid. This solver uses the grid-based Navier Stokes method, maintaining incompressible pressures using multiple iterations of a process over the field’s voxel grid, and can have a sizeable performance impact with high-resolution fields.
Parameters
These properties control the 3D transforms of the node. Transforms will generally be inherited by child nodes, although they can be ignored through the Inherit Transform Channels attributes.
Control the inheritance of the transforms from the parent.
These properties control the core behaviours of the node.
Parameter Details Vorticity Confinement Scale
Controls the amount of vorticity confinement, which increases the number of small swirls in the fluid system.
Diffusion Amount
How much the field colours are diffused to neighbouring voxels.
Velocity Dampening
How much velocities are dampened and averaged across the field system.
Expansion By Temperature
Expand fluid cells according to their temperature, driving buoyant convection.
Temperature Vorticity Amplification
Amplifies vorticity in proportion to cell temperature, curling hot regions of the fluid more than cool ones.
Velocity Vorticity Amplification
Amplifies vorticity in proportion to cell velocity, encouraging eddies in fast-moving regions.
Solver Iterations
How many times the fluid system solver is run. Higher values improve accuracy, but lower performance.
Solver Pre-Smoothing Iterations
The number of smoothing passes applied to the pressure field before solving.
Advect Mode
Method by which the advection of properties from one cell to another is calculated.
- Maccormack :
- Simple :
- Runge-Kutta :
Maccormack Advection Factor
Strength of the MacCormack correction applied during advection, which sharpens fluid detail. Lower values blend back towards simple linear advection.
Downsample Velocity
Run velocity advection at half resolution to improve performance, at the cost of some fine detail.
The properties control the time at which the node is active. See Timeline for editing time segments.
Parameter Details Duration
Control the duration of the node’s time segment.
- Composition Duration : Use the length of the composition for the node’s time segment duration.
- Custom : Set a custom duration for the node’s time segment.
Node Time
The custom start and end time for the node.
Duration (Timecode)
The length of the node’s time segment (in time).
Duration (Frames)
The length of the node’s time segment (in frames).
Time Segment Enabled
Set whether the node’s time segment is enabled or not in the Timeline.
Inputs
These properties control the 3D transforms of the node. Transforms will generally be inherited by child nodes, although they can be ignored through the Inherit Transform Channels attributes.
Control the inheritance of the transforms from the parent.
These properties control the core behaviours of the node.
| Parameter | Details |
|---|---|
| Vorticity Confinement Scale | Controls the amount of vorticity confinement, which increases the number of small swirls in the fluid system. |
| Diffusion Amount | How much the field colours are diffused to neighbouring voxels. |
| Velocity Dampening | How much velocities are dampened and averaged across the field system. |
| Expansion By Temperature | Expand fluid cells according to their temperature, driving buoyant convection. |
| Temperature Vorticity Amplification | Amplifies vorticity in proportion to cell temperature, curling hot regions of the fluid more than cool ones. |
| Velocity Vorticity Amplification | Amplifies vorticity in proportion to cell velocity, encouraging eddies in fast-moving regions. |
| Solver Iterations | How many times the fluid system solver is run. Higher values improve accuracy, but lower performance. |
| Solver Pre-Smoothing Iterations | The number of smoothing passes applied to the pressure field before solving. |
| Advect Mode |
Method by which the advection of properties from one cell to another is calculated.
|
| Maccormack Advection Factor | Strength of the MacCormack correction applied during advection, which sharpens fluid detail. Lower values blend back towards simple linear advection. |
| Downsample Velocity | Run velocity advection at half resolution to improve performance, at the cost of some fine detail. |
The properties control the time at which the node is active. See Timeline for editing time segments.
| Parameter | Details |
|---|---|
| Duration |
Control the duration of the node’s time segment.
|
| Node Time | The custom start and end time for the node. |
| Duration (Timecode) | The length of the node’s time segment (in time). |
| Duration (Frames) | The length of the node’s time segment (in frames). |
| Time Segment Enabled | Set whether the node’s time segment is enabled or not in the Timeline. |
| Name | Description | Typical Input |
|---|---|---|
| Transform Modifiers | Apply the transforms of another node to this node. | Null |
| Target Node | Modifiy the rotations of the node to always direct the z axis towards the input. | Null |
| Local Transform Override | Apply the transforms of another node to this node, relative to its parent. | Null |
| Parameter Value Array | Used to set the parameters of the node using an array. | Parameter Array |