[zlk]

Hello,

I used a mesh motion and VOF model to simulate the movement of water in a tank. As the picture showed, the tank rotate with the speed of 3 rad/s to watch how the water move. Inviscid model was used to check whether the water can move through rotation of the tank. In my opinion, the water shouldn't move in this kind condition, because there is smooth wall and no viscous force. That is, tangential wall motion (such as rotation) has no effect on inviscid flow. However, the result is quite out of my expectation. As you can see, the water seems to rotate and even the geometry of the tank deformed, which was quite obvious after a long time (larger than 100s).

As we all know, mesh motion is a special case of dynamic mesh. That is mesh move as a rigid body and any deformation shouldn't appear.

I am quite confused by the result now. I don't know what happened there. Because I want to use mesh motion combined with VOF in other similar problem, I feel uncertainty about the combination which means I doubt whether it is right and safe to use mesh motion and VOF together. please tell me what you think of it. I will be very appreciated for you help.

P.S. any other set up of solution is default.

[zlk]

P.S.S. In order to eliminate the geometry effect, I used a cylinder tank this time. Other condition were kept same, but I found similar problem. The water moved even more fierce as the picture showed.

I was very confused. I found that Fluent help said "sliding mesh required that the mesh must have different cell zone for each portion of the domain that is sliding at a different speed." But in this case, it only have a single zone. I am not sure whether this is the reason. I don't think so because I found other guys used sliding mesh in a single zone problem before.

So, if you know any clue for it, please tell me, thanks.