# Implementation of the Low-Reynolds-number Chien model

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 March 24, 2010, 19:16 Implementation of the Low-Reynolds-number Chien model #1 New Member   Marco Join Date: Mar 2010 Posts: 9 Rep Power: 8 I'm trying to implement the Chien model with OpenFoam, but I have some general doubts on the description of y+. The Chien model uses y+ for the definition of the damping factors. Suppose to describe a 2D duct flow in with the following configuration: HTML Code: ```
/\  y       |       |       |       ------------>  x  ____________________________________________ ->                                                                    -> ->                                                                    -> ->                                                     *             -> ->_________            _ ,    °   .________,*________->                   |         |  |         |                                   |____ _|  |___ __|
``` y+ is defined as: y+ = (U_t * y) / nu and U_t(x) = sqrt(tau_w(x) / rho) y+, U_t, tau_w are functions of x!!! It is necessary to define for each point (x,y) of the numerical domain the x coordinate in which define y+, U_t and tau_w. An example: In both points identified with " * ", tau_w must be evaluated in " , ". But in the point " ° ", shall tau_w be associated with " , " or with " . " ? Does anybody have experience on this aspect? What is the principle to adopt in this task? Marco

 Tags chien, low-re, openfoam, yplus

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