Hi,

I'm working on simulating a river (I'm following a tutorial from Applied Houdini).
I make a first simulation with a fairly low resolution, take the last frame from it, recreate more particles and their velocities, and run the sim again starting from this new initial state.

The first sim (the proxy sim) works fine.
The higher res sim however seems fine at frame 01, with the particles having the right speed. But on frame 02, all the particles lose their velocities and loosely settle in the riverbed.

There's no apparent difference bewteen the two initial states, apart from the amount of particles and the velocity which are much higher in the higher res state.


If that's of any use, I'm using Houdini FX Education 19.0.383, on Windows 10

I've attached my scene, I can also add the geometries if needed
I'll make a simpler scene tomorrow and see if it gets resolved

Thanks in advance !

I've simplified my scene, using less complex geometry, and I get the same result
I've tried running and caching the sim on my own computer instead of the network I usually use
I've removed the caches I used for caching the geometries and initial states
I've run it on the 19.0.498 build
Still no idea why that's happening

Here's the simpler version, you can run it on your own if you want
There's basic instructions in the CONTROLS null

My issue seems to be fixed, not totally sure why
The fluidcompress node I had put right before caching the HQ sim might have been the problem
Copying it and putting it before caching the proxy sim gave the proxy sim the same behavior as the HQ one
I just recreated the node and it seems to work fine now (maybe the back and forth between different versions of Houdini corrupted it)
I also made a mistake in the boundary layer of the FLIP Solver, not pluging in the right input for the Surface Volume

Hopefully everything continues to work fine now