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Particles | particles, useprt – Allows the source to emit particles into the Simulator. The particle birth rate is in thousands of particles per second.

Type | prttype – Specifies the type of particles created by this source:

Drag – The source will emit Drag particles. These are the simplest Phoenix particles and are just carried by the velocity of the simulation, without interacting with one another. They can be shaded using the Particle Shader and can be used for simulation of embers, or integration effects such as dust or sand. The RGB color of Drag particles is inherited from the Source and written in the cache files if the Simulator → Output → RGB Grid Channel is enabled.
Foam – The source will emit Foam particles into liquid simulations. Note that Foam simulation must be enabled from the Liquid Simulator so this type of particles can be emitted into it.
Splashes – The source will emit Splash particles into liquid simulations. Note that Splash simulation  must be enabled from the Liquid Simulator so this type of particles can be emitted into it.

Modifiers | dmodprt – Discharge Modifiers can be attached here in order to affect the Particles parameter.

Mask | prtmap, useprtmap – Allows you to vary the amount of particles over the surface or the volume of the emitters. If this is not used, the Source will emit equal amount of particles over the entire surface or volume of the emitters.

Lifespan (secs) | prtlife – The maximum age of the particles created by this source, specified in seconds.

Lifespan var. | prtlifevar – Adds variation of the particles' lifespan, specified in seconds.

Output Drag Particle Channels - Drag particles are created as separate particle systems per each Source that creates them, using the name of the emitting geometry. This is why the particle channels written to the simulation cache files are chosen from the Source, unlike the channels of other particle types which are set through a Simulator's Output rollout. Note that writing more channels to the cache files takes more time and will add up to the simulation time, so if you know in advance that you will not be needing a certain channel for rendering, then it would help the simulation times if you turn it off.

Velocity | prtexportvel – When enabled and the particle Type is set to Drag, this parameter exports the Velocity channel to the cache files, so that you can use it for rendering with motion blur or coloring of particles based on their speed using the Particle Texture.

ID | prtexportid – When enabled and the particle Type is set to Drag, this parameter exports the ID channel to the cache files.

Age | prtexportage – When enabled and the particle Type is set to Drag, this parameter exports the Age channel to the cache files.

RGB | prtexportrgb – When enabled and the particle Type is set to Drag, this parameter exports the RGB channel to the cache files.

• Particles with attached geometry (such as PFlow particles using a Shape Instance operator) will act like standard geometry obstacles and will push the fluid by default, as long as their Solid Phoenix property is enabled.
• Particles without geometry (even PFlow particles with a plain Shape operator) will need to be attached to a Source in order to interact with the fluid in any way.
• Particles without geometry can emit fluid using their shape and size using the Source's Particle Shape and Custom Prt Size options.
• Particles without geometry will not affect the fluid's motion by default, so you need to enable Motion Vel. explicitly if you need this effect.
• If Motion Vel. is enabled, the fluid emitted by a particle may refuse to leave the particle shape area and continue to move together with the particle, because it will have the same velocity.