N Fn1nt

Thus, the initial dependence (3.2.3) among the n + 1-dimensional variables is actually reduced to dependence (3.2.7) among the n + 1 — k non-dimensional combinations, QED.

Now, we return to (3.2.2) and, following Monin and Yaglom (1965), set the form of the function fu(zujv) for two limiting cases: large and small values of the argument zujv. First we recollect that on the wall (at z = 0) the mean velocity u and velocity fluctuations u' and w' vanish because of the no-slip conditions. Hence, in the vicinity of the wall (at small zujv), one can select a layer called the viscous sublayer within the limits of which the viscous stress pv du/dz is much larger than the Reynolds stress —pu'w'. Then, according to (3.2.1), t/p = v du/dz = const, hence,

0 0

Post a comment