HySPH Mist Simulation

Starting point for mist is always an existing HyFLIP and splash/wet simulation. Here the simulations from → "Quick Start Tutorials - HyFLIP Fluid Simulation" and → "Quick Start Tutorials - HySPH Splash Simulation" are used.

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Quick Start

• Set the domain's and splash emitter's simulation state to → “Cache” (“yellow rocket”).

• Other, already simulated HySPH emitters have be set to “Cache” as well.

• Add a “Mist” node from the “Hybrido” shelf.

• Reset the scene.

Open

What you can see now is a bounding box with a dimension of 10 m x 10 m x 10 m. The box can be positioned and scaled with the settings under Node Params > Node or the W and R keys. Mist is

• only created inside this box and it cannot leave its domain

• not affected by “k” daemons.

Open the → “Mist” parameter section for further adjustments:

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• “Cell size” can be set independently from the domain's own → “Cell size” value.

• “Solver” should be “Fast” – the results will be good enough.

• “Radius threshold” is the most important parameter, because it controls the amount of foam (see below for more information).

The "Radius threshold" parameter depends on the splash particles' lifetime.

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• When a splash particle is created its radius is 1. Depending on the lifetime settings, the particle's radius becomes smaller over time until it reaches 0.

• Lifetime is adjusted under → "Splash Dynamics" or → "Wet Dynamics".

• You have to decrease these parameters in most cases, e.g. to 1.5 s ("Splash | Wet min lifetime") and 2.0 s ("Splash | Wet max lifetime").

• Smaller thresholds will reduce the amount of mist.

Simulate.