# Wall functions

(Difference between revisions)
 Revision as of 13:03, 13 June 2008 (view source)← Older edit Latest revision as of 09:47, 17 December 2008 (view source)Peter (Talk | contribs) m (Reverted edits by RolmoNboce (Talk) to last version by Radi Sadek) (4 intermediate revisions not shown) Line 1: Line 1: Based on [[Law of the wall|law of the wall]] Based on [[Law of the wall|law of the wall]] - A wall-function simulation normally requires that [[Dimensionless wall distance|y plus]] of the first cell outside the walls is in the log-layer, which starts at about y plus 20 and, depending on the Re number, extends up to say y plus 200. In the log layer, there is equilibrium beteen production and dissipation of the turbulent kinetic energy, therefore dicreasing turbulent instability near to wall. + A wall-function simulation normally requires that [[Dimensionless wall distance|y plus]] of the first cell outside the walls is in the log-layer, which starts at about y plus 20 and, depending on the Re number, extends up to say y plus 200. In the log layer, there is equilibrium between production and dissipation of the turbulent kinetic energy, therefore decreasing turbulent instability in near-wall simulations. Another empiric profile that covers both the near wall and logarithmic region is the [[Reichardt profile|Reichardt profile]]. Another empiric profile that covers both the near wall and logarithmic region is the [[Reichardt profile|Reichardt profile]]. {{stub}} {{stub}}

## Latest revision as of 09:47, 17 December 2008

Based on law of the wall

A wall-function simulation normally requires that y plus of the first cell outside the walls is in the log-layer, which starts at about y plus 20 and, depending on the Re number, extends up to say y plus 200. In the log layer, there is equilibrium between production and dissipation of the turbulent kinetic energy, therefore decreasing turbulent instability in near-wall simulations.

Another empiric profile that covers both the near wall and logarithmic region is the Reichardt profile.