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fluent °ïÖúÎĵµ31.4 Alphabetical Listing of Field Variables and Their Definitions
Skin Friction Coefficient    (in the Wall Fluxes... category) is a nondimensional parameter defined as the ratio of the wall shear stress and the reference dynamic pressure
C_f \equiv \frac{\tau_w}{\frac{1}{2} \rho_{\rm ref} {v^2_{\rm ref}}}         (31.4-36)
where $\tau_w$ is the wall shear stress, and $\rho_{\rm ref}$ and $v_{\rm ref}$ are the reference density and velocity defined in the Reference Values task page. For multiphase models, this value corresponds to the selected phase in the Phase drop-down list.

Axial-Wall Shear Stress    (in the Wall Fluxes... category) is the axial component of the force acting tangential to the surface due to friction. Its unit quantity is pressure.
Wall Shear Stress    (in the Wall Fluxes... category) is the force acting tangential to the surface due to friction. Its unit quantity is pressure. For multiphase models, this value corresponds to the selected phase in the Phase drop-down list.

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