If Sij represents the rate of deformation, μ represents the dynamic viscosity and \(\vec{V}\), the velocity of the flow, What does the terms div(2μ\(\vec{V}\)Sij) and 2μSij account for?

If Sij represents the rate of deformation, μ represents the dynamic viscosity and \(\vec{V}\), the velocity of the flow, What does the terms div(2μ\(\vec{V}\)Sij) and 2μSij account for?

(a) The effect of turbulent stresses

(b) The effect of viscous stresses

(c) The effect of Reynolds stresses

(d) The effect of kinetic energy

I had been asked this question by my school principal while I was bunking the class.

Query is from Turbulence Modelling topic in division Turbulence Modelling of Computational Fluid Dynamics

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If Sij represents the rate of deformation, μ represents the dynamic viscosity and \(\vec{V}\), the velocity of the flow, What does the terms div(2μ\(\vec{V}\)Sij) and 2μSij account for?

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