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To follow along this tutorial, you must first go through the Creating a Simple Liquid Simulation tutorial, or if you already have an existing liquid-only simulation setup, you can modify it following the steps from this tutorial steps.

With the Simulator node selected, go to the Foam tab rollout and select Enable Foam. A message box asking if you want a particle shader generated will appear. Choose Yes.

Note that in the Outliner, 3 new items have appeared - a shader Particle Shader, a new set and a particle group inside the set.

Rename the shader node to phx_foam_shader_01. The shader, unsurprisingly, The Particle Shader contains the shading parameters for the foam particles. You can choose the render mode for the particles, adjust their size sizes and count, or enable/disable Motion Blur, etc.

Rename the set to phx_foam_set. This set The phxParticle_set1 set is used to specify what particle groups systems the shader Particle Shader is responsible for shading at rendertimerender time. In some cases you may want to have multiple particle groups affected systems drawn by the same shader, or multiple shaders affecting drawing the same particle groupsystem.

Expand the phx_foam_set and rename the node inside to pg_ phxParticle_set1. Inside it there is the particle system for the Simulator's foam. You can think of the particle groups systems as a reference references to the particles in the simulation. A single Simulator can create several particle systems and these particle system nodes allow you to pick individual systems in Particle Shaders or for example in the Phoenix Particle Texture.

There are five groups types of particles that the Phoenix FD Simulator can output - Liquid, Foam, Splash, Mist and Drag.

Start the simulation to see the result.

You can go to the Preview -> Particle Preview tab rollout of the simulator and disable Show Mesh and the preview of Liquid particles by deselecting Show Selected System. This allows you to isolate specific particle types and troubleshoot their behavior.

Even though the tickbox reads Enable Splash/Mist, only a Splash particle shader is automatically generated. If you'd like to also render the mist Mist, follow the steps below:

First, create a new Particle Shader from the Phoenix FD Menu or from the Phoenix Self.

Set the Mode ot Points.Rename the shader node to phx_mist_shader_01 and the generated set to phx_mist_set of the Particle Shader to Points.

Note that this time around the set of the Particle Shader is empty. You need to manually add the particle group to the set and connect the simulator node to the shadersystem Particles_Mist_of_0_PhoenixFDSimulator1 to phxParticle_set3 (by middle button dragging the system under the set, or by editing the sets via the Edit Particle Systems button on the Particle Shader).

Select Also connect the PhoenixFDSimulator1 node to the Liquid Simulator slot of the Particle Shader, by selecting the Simulator and then shift select the mist particle shader and click +selecting the Particle Shader and pressing the Set Selected Object button in the mist shader's Attribute Editor windowas Liquid Simulator button.

Run the simulation again.

Hide the Phoenix Simulator which is responsible for rendering the liquid mesh, and also the Foam and Splash Particle Shaders.

Hit render - you should now be able to see the mist particles rendered as points

With the Simulator selected, go to Windows -> Node Editor. Graph the Input/Output connections for the simulator and find the PG_ ... _Mist node. Middle mouse button drag it into the phx_mist_set so the mist shader is aware of it.

Then, rename it to pg_mist to keep things consistent.

There are too few Mist particles and furthermore they are barely visible in the combined render when they are rendered as Points.

Increase the Count Multiplier of the Particle Shader to 10. This will create additional Mist particles at render time to make the mist render thicker.

Switch the Mode of the Particle Shader to Fog. Under the Particle Shader's Fog rollout, reduce the Fog Voxel Size to 0.1 (the same as the Simulator's Cell Size), and also increase the Fog Density to 1 to make the mist thicker.

Hide all Phoenix FD nodes but the phx_mist_shader.

Hit render - you should now be able to see the mist particles rendered as points

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That is all. You should now have a working particle setup with Foam, Splashes and Mist. Play with the Simulator properties and the Particle Shader attributes to get a good understanding of how everything ties together. You may also like to go through the Particle Shader tutorial or head over to the documentation page.