Question: The viscosity terms in x-momentum equation is frac{partial au_{xx}}{partial x}+frac{partial au_{yx}}{partial y}+frac{partial au_{zx}}{partial z}. In a more general form, this becomes div(? gradu). Which of these relations is used for this transformation?
Options
A : Thermodynamic relations
B : Stress-strain relations
C : Fluid flow relations
D : Geometric relations
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