The zero crossflow finite difference formula analogous to Equation (38) is 



^iO / i+1 „iO\ „iO „i+l 1 ._ 

 D fW - W \ B W - piO 



After rearranging the terms of Equation (44) , one obtains the equation 



D^^ W^+1 + B^O W^+1 1 = C^O (45a) 



where 



giO ^ V B^O (45b) 



rh„ 



A similar argument at the symmetry plane 6 =- 7t/2 yields the finite 

 difference equation 



_ B^M ^i+1 M-1 ^ ^iM ^i+l M ^ -iM (^^^^ 



where 



-iM ^ S_ B^M (46b) 



The finite difference Equations (35), (45), and (46) form a linear 

 system of algebraic equations for the unknowns W where i = 0,1,..., N 

 and j = 0,1, . . . ,M. 

 Let matrix D be defined by 



24 



