Boussinesq approximation may refer to:

• Boussinesq approximation (buoyancy) for buoyancy-driven flows for small density differences in the fluid
• Boussinesq approximation (water waves) for long waves propagating on the surface of a fluid layer under the action of gravity
• Turbulence modeling and eddy viscosity for the Boussinesq approximation resulting in the use of an eddy viscosity to model the turbulence Reynolds stresses

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