Hi, I am modeling sloshing of a fluid inside a container using ANSYS Fluent. 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 after sometime. However, the surface that I get fluctuates. As it is shown in the image (it is just an indication), 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,
Just a thought, but is your acceleration constant or does it change instantly from 0 to ax and az? That could be causing the transient sloshing.
Liquid have surface tension, acceleration disturb the stabilty of surface tension
Thank you so much for your responses. 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.
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