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taktoa

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- TL;DR Summary
- Is there an equation, similar to Navier-Stokes, that encompasses incompressible fluid flow with spatially varying viscosity?

Does anyone know of a differential equation, similar to Navier-Stokes, that encompasses incompressible fluid flow with spatially varying viscosity? Viscosity is treated as a global constant in NS; I've found some papers online that address NS with viscosity as a function of velocity, but I can't seem to find any on NS with viscosity as a function of position.