The wall boundary conditions are u (s,n) = v (s,n) = at n = 0. Effects 



s n 



due to longitudinal curvature are neglected. The Reynolds stress model 



is given in detail in the section presenting the turbulence characteristics. 



The Reynolds stress -u'v' in the modified Douglas C-S computer code 



1 5 13 ^ ^ 



is modeled ' ' by 



3u^ 

 "9^ 



for < n < n 

 — — c 



(7) 



for n < n < 6 

 c — — 



where e. 



8u^ 

 "8^ 



eddy viscosity in the 

 inner region 



e„ = 0.0168 U 6 Y 

 e p tr 



= eddy viscosity in the 

 outer region 



£ = 0.4 r £n 



v^o/( 



1-exp 



/ T ^ 



-1/2 





A= 26 V (^ 



Vp / 



1 





6=6^ ,^. 







£n 



/J 



0.995 



mixing length parame- 

 ter in the inner region 



= Van Driest 's damping 

 factor 



= boundary layer thick- 



ness — = 0.995 



<^[Hh 



= planar displacement 

 thickness 



= computed potential flow 

 velocity at the edge 

 of the displacement 

 body 



= wall shear stress 

 = value of n at which 



29 



