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What is Understanding Bulk Viscosity in Fluids about?

Bulk viscosity is a property of fluids that accounts for resistance to volume changes. It is introduced in the Navier-Stokes equation through an additional term involving the divergence of velocity. If not accounted for, bulk viscosity can impact the modeling of high-speed dynamic events where volumetric straining effects are significant. Not considering bulk viscosity does not affect inviscid, incompressible, or boundary layer flows where normal viscous stresses are small compared to shear stresses.

Author

Marcelo Pirôpo

Language

EN