| 1. | In general, the rate of change of the deformation over time ( viscous stress ).
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| 2. | This tensor may be expressed as the sum of the viscous stress tensor minus the hydrostatic pressure.
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| 3. | In very general terms, the fluid's viscosity is the relation between the strain rate and the viscous stress.
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| 4. | In the absence of such a coupling, the viscous stress tensor will have only two independent parameters and will be symmetric.
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| 5. | The calculated friction drag D _ f utilizes the x-projection of the viscous stress tensor evaluated on each discretized body surface.
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| 6. | However, if the deformation is changing with time, even in fluids there will usually be some viscous stress, opposing that change.
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| 7. | In these regions the inertia force becomes less important and the flow is determined by the balance of viscous stresses and the pressure gradient.
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| 8. | When the viscosity is negleted, the term containing the viscous stress tensor \ mathbf { \ tau } in the Navier Stokes equation vanishes.
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| 9. | In particular, the local strain rate is the only property of the velocity flow that directly affects the viscous stress at a given point.
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| 10. | In most fluids the viscous stress tensor too is symmetric, which further reduces the number of viscosity parameters to 6 ?6 = 36.
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