A very common approach with large scale fluid simulations and all kinds of vessels is the usage of moving domains. This technique allows you to simulate only a small area – a segment – around a ship instead of a huge volume. And this fluid segment moves with the ship. Such a setup is just a matter of minutes:

Start with the → animation of the ship.
A linear motion along an axis is the most economic type of motion in terms of domain size and simulation time.

Now, a container is required to keep the fluid:

Create a container, for example a “Cube_top_open” object from the “Objects” shelf.
Scale the container until it encloses the entire way of the ship and its geometry.
It is also possible to start with the ship outside the container in order to get a smooth initial bow wave.

In the next step, an emitter object is added:

This simple “Cube” will be moving and represents the fluid segment around the ship (see inner cube in the image above)
Its length should be greater than the ship; its width should match the width of the container.
Cube01 > Node Params > Node > Parent to > select the animated ship
With this step the emitter object will follow the ship's motion.
Hybrido shelf > Emitter > select “Cube01” if you are prompted to do so.
Hybrido shelf > Domain

The scene setup is almost ready:

Daemons shelf > Gravity | k Volume
Rescale the “k Volume” daemon as seen in the image below and place it behind the emitter object.
k_Volume01 > Node Params > k_Volume > Inverse > Yes
k_Volume01 > Node Params > Node > Parent to > select the animated ship
The daemon will now follow the ship as well.
To be on the save side add a second "k Volume" and place it near the ship's bow.

Finally, an important step to make everything work:

HY_Emitter01 > Stream > Yes
This option makes sure that the emitter object is constantly refilled while moving.
If you want to achieve stronger waves or the impression of a higher speed set "Initial velocity" to "Constant", and increase “@ speed”.
When “@ speed” is greater than 0 rotate the emitter's viewport icon with the E key: it should point in opposite direction to the ship's motion direction.

Run a test simulation to see if everything works. In the last step configure the HyFLIP domain, → cell sizes, and → fluid-object interaction. Then, start the final simulation.

A frame from the simulation with a second "k Volume" at the cube node's front.

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