The viscosity panel was confusing for users because viscosity is defined by the base and exponent properties in the Diffusion panel. What this setting actually does is use a special solver algorithm that is designed for high viscosity liquids. See 635694c0ff8fc5c9828bf920ecb81bb9bf792a82 for details. The below changes are designed to better represent this to the user. - Move the "Viscosity" Panel to a sub panel of "Diffusion" - Rename "Viscosity" to "High Viscosity Solver" to better represent what this property does - Update `use_viscosity` tooltip to better explain that this uses a different solver algorithm. Pull Request: https://projects.blender.org/blender/blender/pulls/116118
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