Render a test tube with liquid inside.

Helle everyone.

I need help with a certain animation. Firstly I want to fill a test tube with liquid. When I’ve done that I want the liquid to bubble. For some strange reason the test tube stops the liquid from entering it’s open top (Sphere as liquid, test tube as obstacle). Can anyone give me advice on creating the animation I want to create?

Did you change the test tube from a volume to a shell in its fluid properties ?
http://wiki.blender.org/index.php/Doc:Manual/Physics/Fluids#Fluid