[BehrouzMohammadian]

Hi,

I am modeling sloshing of a fluid inside a container. For this, I am using VOF model. I consider two accelerations. ax=2 m/s2 and az=9.81 m/s2. The modeling continues for 2 sec. Physically, a container with a liquid inside under constant acceleration will have a steady inclined surface. However, the surface that I get fluctuates. As it is shown in the image the flat surface reaches to max inclination until t=0.8 sec. After that the surface starts returning to its original flat horizontal condition and again starting going up. Could you please let me know what is the problem?

Thank you,

[BehrouzMohammadian]

After discussing this with others, I found my answer. So I mention it here because it might be helpful.
After applying constant acceleration to the container, the fluid starts gaining inertial forces and moves toward a wall. After reaching the wall it hits the wall and bounces back. That is the reason I get fluctuations. However, by continuing my model until t=10-15 sec, the flat surface will be almost steady at an inclined shape. So it is a matter of time to reach that steady inclined surface.