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Here are the three possible modes – you can read more about this topic under → "Fluid-Object InteractionAdding Objects" and → "Filling Objects".
- "Solid inside" makes the fluid collide with object's outer surface.
- "Solid outside" creates a hollow object and fluid interacts with the inner surface.
- "Shell" is normally used with open objects like glasses, vases, but also planes. When active, an invisible layer is added around the object's surface. The thickness of this layer is
Cell size * 3. As a consequence, there will always be a gap between the fluid and the object.
By default, "Volume Mode" is determined automatically by analyzing the object's geometry, but this test is not always reliable. For manual control uncheck "Auto". If you can see leaking particles in conjunction with thin or single-walled objects please consider activating → "Continuous Collision Detection" in the "Collider" tag.