I'm trying to create a heart that fills up with orange paint revealing its shape. However, I'm getting weird ripples on the sides. What am I missing?
Here's a link to my Blender file: 
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$\begingroup$ Domain's Grid resolution I guess? blender.stackexchange.com/questions/6561/… $\endgroup$– vkliduCommented Feb 10, 2020 at 22:57
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$\begingroup$ To your blend - you need to higher "Smooth Suface" value like 2 or more and (in cost of loosing original shape) use Smooth modifier after Fluid modifier. Or increase domain resolution something really high. $\endgroup$– vkliduCommented Feb 11, 2020 at 20:22
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1 Answer
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"Ripples" comes from domain grid resolution. Higher value makes them less visible. To spent less time by baking you can try Smooth modifier after Fluid modifier.
Note: As far as fitting everything in the domain, you can make the domain as big as you like, but just leave it box style in shape. The size of the domain does affect calculation time that is why it is best to crop it as close as you need to the fluid object participants.
blender 2.81a
- use a Cube (rectangle) as a domain (not Sphere shape)
- example with Final Resolution 120
- Bake > Boundary > Surface Smoothing 2
- Smooth modifier > Facor 2,5 / Repeat 12 (see second GIF)
Resolution 120 (even with smooth "ripples" are still visible)
Resolution 120 + Smooth modifier
In some cases you can "smooth" it by Boolean modifier - cut it out by a bit Smaller obtacle (heart), but its a dirty way (with many artefacts in shading and animation).
Just if you have an option I would recommend Flip Fluid addon (try Free version first). Without any additional setup just grid res 120 as well. Faster, higher res, preview calculated frames due baking ...
Resolution 65
Resolution 120
Note: Lines on Blender's fliud are the same as yours = domain grid artefacts. Lines on FlipFluid object is obtacle shape, it just copied surface so well. I should make it more smooth before baking.
blender 2.82
This version use MantaFlow solver you can try luck with it.
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$\begingroup$ Thank you for a well-written comment. I was hoping it would work, but it doesn't seem like it is. I've edited my question to include a download of my project file at the top. Can you have a look and see if I'm just completely forgetting something? Thank you! $\endgroup$– ChaseCommented Feb 11, 2020 at 17:03
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1$\begingroup$ Thank you! This is a huge help and you saved me a lot of wasted time. $\endgroup$– ChaseCommented Feb 11, 2020 at 20:41