It is the non-dimensional distance from the wall on the basis of which the level of turbulence can be classified. If the level can be three, the lower zone will have less fluctuation of parameters compared to the middle and upper zones. The time scale of turbulence is different in these three levels.
xz + x + yz + y = (x + y)(z + 1)
a(x + y + z)
35
(x-y) + (xy - 1) = (x - 1)(y + 1)
xy plus 2x plus 4y plus 8 or (xy+2x) + (4y+8) or x(y+2) + 4(y+2) or (x+4)(y+2)
(y+2)(y+3)
(y + 5) (y + 2)
(y + 7)(y + 7)
(z + 1)(y + x)
(x + y)(x + y)(x + y)
(y + 8)(y - 7)
(y + 5)(y - 4)
y^2 + 7y + 12 = (y+4)(y+3)
3(y + 4)(y + 2)
4(y + 2)(y + 2)
X + Y (X + Y) ^2 = (X+Y)(X+Y) Factor = (X + Y)
3xz+3yz+x+y=(x+y)(3z+1)