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I have a problem with fluid going through an object even though I set it to be an Obstacle. I made a video explaining my problem.

Settings:

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.blend and other related files here.

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    $\begingroup$ Aside: in case you don't know, you can Ctrl-click or double-click on an object's name to rename it within Blender, so that you can see your handy labels while you work! $\endgroup$ – wchargin May 29 '16 at 7:24
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For your Obstacle object, under Properties panel> Physics > Fluid > Volume Initialization:, select Shell.

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Another thing that sometimes helps is adding a "solidify" modifier to your object. This gives the object a thickness that can help with fluid aberrations. This modifier must be applied or at least above the other modifiers in the stack to work properly.

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I had the same issue (object not interacting at all with the fluid, whereas primitives like a cube would interact correctly)

Turns out in my case Export Animated Mesh had to be checked on the obstacle object

screenshot of fluid configuration with Export Animated Mesh checked

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