Interpretation of Spalding's viscosity damping coefficient -- CFD Online Discussion Forums

March 6, 2019, 10:19	Interpretation of Spalding's viscosity damping coefficient	#1
Lmath New Member Join Date: Jan 2019 Posts: 7 Rep Power: 7	According to Spalding's law of the wall we have $y^+ = u^+ + exp(-kB)(exp(ku^+) - 1 - ku^+ - \frac{(ku^+)^2}{2} - \frac{(ku^+)^3}{3})$ leading to $\mu_t = \mu * exp(-kB)(exp(ku^+) - 1 - ku^+ - \frac{(ku^+)^2}{2})$ , which can be interpreted as a damping function applied to the viscosity. How does this damping function behave (or should behave) as becomes large. Also up till what values of does the expression for hold? It seems that in order for the latter to be equal to, say, 100, a negative value for the former is needed. How is this possible?

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