Question: By analogy with Eq (6.21) write the turbulent mean-momentum differential equation for (a) The y direction and (b) The z direction how many turbulent stress

By analogy with Eq (6.21) write the turbulent mean-momentum differential equation for (a) The y direction and
(b) The z direction how many turbulent stress terms appear in each equation? How many unique turbulent stresses are there for the total of three directions?

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