Fluid disappears after frame 300 or so

[zachkadish]

Why does a dynamic fluid disappear about after frame 300 at 30 per second? I hae set up this really cool dust plume from an expoltion but I need it to last at least 10 seconds. However after testing the symulation to run that length it kind of freeks out and just starts disappearing. Its like the symulation breeaks down into just random turbulance. Any thoughs or suggestions would be great.

zach

[duncanbrinsmead]

If you have a sharp boundary in the fluid opacity graph, then it could be that the overall density is just moving this threshold had that point( due to diffusion ). You may have too much diffusion with open boundaries, as density conservation is not observed for the open boundary case.You might gradually animate the densityScale upwards to compensate.

Duncan

[tom-downes]

maybe try adding some velocity damping if the turbulence is getting too wild.
also, be careful if you`re using normal dynamics forces, these can compress the fluid to the point that density just disappears.
t

[stwagstaff]

I've had this same problem using turbulence with fluids. The turbulence seems to just blow the simulation out of the container after about 300 frames or so. My solution has been to completely turn turbulence off, and to use Swirl, and other fields, to give me turbulent effects.

[zachkadish]

Thanks for the replies, they have all been great suggestions and I have solved my problem. Things are looking great and I am on my way to one purly awsome CG explosion.

zach