Waterline

Starting point for splashes is always an existing Hybrido core fluid simulation. Here it is a simple water basin with an animated object.

Scene Setup

Set the domain's simulation state to → “Cache” (“yellow rocket”).
Other, already simulated Hybrido secondary fluids emitters have be set to “Cache” as well.
Add a “Waterline” emitter from the “Hybrido” shelf.
Reset the scene.

What you see now is a cross in the viewport's centre, indicating that the emitter is not bounded. You can prevent the particles from leaving the domain:

Add/reuse a → “k Volume” daemon and adjust it to the scene with the R key.
Or make sure that the particles will be enclosed inside a container or a cube.

Open the emitter's → “Waterline Creation” panel:

Choose the object(s) which should create the waterline particles.
Adjust the waterline's “Width” and keep the value in mind, e.g. 0.2 m.
Be careful with “Emission rate”, because the amount of particle can grow quickly.

If you want to dissolve the foam, for example to create a nice foam trail behind an object follow these steps:

Open the → “Waterline Dynamics” panel.
Set “Min lifetime” to a smaller value, e.g. 2.5 seconds.
Set “Max lifetime” to 3.0 seconds.

Finally you have to adjust the waterline object:

Object > Node Params > Volume
Go to the → “Domain offset” parameter and enter the “Width” value from “Waterline Creation”.
In this example it is 0.2.

Simulate.