obstacle in fluid simulation causes water to go away

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obstacle in fluid simulation causes water to go away

Post  Scooter2 on Sat Mar 21, 2015 6:42 pm

Good afternoon,
I am doing a fluid simulation that is a pond with a fish in it that jumps out. The simulation works until I export the mesh of the fish to make it respond proper as an obstacle. After I do that, the water disappears to the edges of the water container or if I change the "impact factor" of the fish the water blows out like a big giant splash.
I have done some simulation where I drop an exported mesh into it without any trouble, but this is the first time I tried one where the obstacle starts out in the water and below the surface.

I am also wondering how to do a scene with a domain that has a real world size larger than 10 meters? Do we just use what we can?

Any ideas? Please let me know.
Thanks,
Scooter

Scooter2

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Re: obstacle in fluid simulation causes water to go away

Post  Scooter2 on Sun Apr 05, 2015 7:07 pm

Good afternoon,
After much experimentation, I have found that the "impact factor" for the obstacles in my simulation have to be set very very low (.000005). I have also learned the normals have to be facing each other for fluid and obstacles.
I also finally figured out what "hide fluid surface" does. If that is not turned on, there will be a visible barrier between the fluid and the obstacle, even under water.
I also found that low resolutions (below 300) for my experiments do not show all of the simulation characteristics.

I have a problem I have not found a solution for and that is the water never comes to complete rest, its alive and moving all the time on the surface like a disturbance. It does this even if I have no obstacles except the container for the water no matter how long a simulation. That also causes unwanted splash particles to be generated from the container even if its "impact factor" is set to zero.
Anyone know how to fix that? I have found nothing regarding this on the internet.

Any input will be much appreciated.
Thanks,
Scooter

Scooter2

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