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The Reynolds stress term used in the RNG k-ε model is given by 2μt Sij-2⁄3 ρkδij. What does the term δij represent?

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The Reynolds stress term used in the RNG k-ε model is given by 2μt Sij-2⁄3 ρkδij. What does the term δij represent?

(a) Kronecker delta

(b) Euler delta

(c) Hermann delta

(d) Cartesian delta

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

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Right choice is (a) Kronecker delta

The best I can explain: The rate of dissipation of the turbulent kinetic energy in different directions are given by the equation εij = ^2⁄3 ρδij. Here, the term δij is the Kronecker delta. This value becomes zero if i≠j. If i=j, it becomes 1.

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