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Overview

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The foam simulation is carried out by an additional particle simulator that is closely connected to the main simulator. The simulation follows several simple rules: underwater bubbles rise up, bubbles in the air fall down, bubbles can stick to each other and can be resistant to external pressure.

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UI Path: ||Select PhoenixFDSim|| > Attribute Editor > Foam rollout

 

Parameters

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Enable foam | foamEnbl – Enables the birth and simulation of Foam particles.

Birth

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Foam Amount | foamBirthRate – Specifies the number of foam particles to be born when a given cell meets the birth condition, in thousands per second. This parameter does not affect the foam born by splashes.

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Example: Birth Threshold     UI Text Box size medium type tip The following video provides examples to show the differences of Birth Threshold values of 50, 100, and 200. Align align center     Video 0 Birth_Threshold.mp4 3 true

 

Lifespan

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The Particle Age channel must be exported in order for these options to take effect (from the Source or from the Output Channels section, depending on the way the foam is generated).

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OutsideLife OutsideLife

Max Outside Age (secs) | foamOutsideLife – If a particle is outside the grid, and its age (in seconds) exceeds this parameter, the particle will be killed instantly. Note that this is not the time since the particle exited the grid, but the time since the particle was born.

 

 

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Size Size

Size

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Size | foamSize – Specifies the size of the bubbles.

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Example: Distribution     UI Text Box size medium type tip The image below provides more details on the differences between Distribution values of 1, 20, and 100. Align align center

 

Dynamics

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B2BInteraction B2BInteraction

B2B Interaction | foamVolCycles – Controls the internal interaction between bubbles (bubble-to-bubble interaction). This option is used when the foam should have a volume. It forces a proper distance between the bubbles and keeps them stuck together. This parameter controls the number of interactions per second. Higher values result in better preservation of the foam's volume. This parameter has linear growth order. In other words, the time taken for calculation is longer when the value is higher. For more information, see the B2B Interaction below.

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Example: Falling Speed     UI Text Box size medium type tip The following video provides examples to show the differences when Falling Speed is set to 10, 50, and 100. Align align center Video 0 FallingSpeed.mp4 3 true

 

 

Patterns

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Pattern Strength | foamPatternForces – Controls the simulation of the foam patterns caused by the fine vertical liquid movement. For more information, see the Strength example below.

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