I try to make my own beach waves simulation like the ones one can find over and over on YouTube. In order to test the animation of the fluid waves, I prepared a small test project, in order to be able to bake the fluid fast for different settings. I'm stuck at the problem that whatever I do, the fluid almost completely disappears after 500 frames. Here are two images after baking at frame 1 and frame 500:

enter image description here enter image description here

I tried many different things like adding surface thickness to the effector objects in my scene or using the "is planar" option (although I have to admit that I don't fully understand the usage of this option...).

This is the fifth incarnation of my beach simulator, in which I build the thickness into the effector objects themself, but it does not work either. I normalized the scale to 1,1,1 like I read in another thread. I totally run out of ideas what the reason for the fluid disappearing could be.

Here is my blend file:

What am I doing wrong?


I tried to add the inflow as Chris suggested. The inflow above the pusher will seriously affect the wave generation and generates chaos.

I understand that the only way to prevent the water from disappearing is to add an inflow. I did it like this now:

The chaos is compensated a little bit...

Still, I wonder how all the beautiful beach wave simulations on YouTube are made, where each wave is rolling really beautiful. Or is it just clever editing in the end?!?


1 Answer 1


It looks like this is a common problem of FLIP:


A workaround might be to use an inflow to compensate it. I tried this with your simulation and it worked pretty well:

enter image description here

As you can see (the orange box is the inflow) there is still lots of water in your domain).

  • $\begingroup$ I also tried inflow for compensation in between sometime but I didn't get it right either because, as a beginner, I was not able to set the right amount. Can you share the blend file so that I can see, what you did? In any way, thank you for your answer as I was about to Go crazy. At least, I have an explanation... $\endgroup$
    – Kiamur
    Jul 28, 2022 at 8:00

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