1549301742-The_Theory_of_Difference_Schemes__Samarskii

(jair2018) #1
536 Difference Methods for Solving Nonlinear Equations


  1. Numerical solution of difference equations by Newton's 1nethod. As
    can readily be observed, the system of nonlinear equations capable of spec-
    ifying the values vj+l, gj+l and 77j+l on every new layer will be solved
    by making several iterations of Newton's method. This can be done by
    reducing equations ( 43)-( 44) to the following ones:


~ - 0.5 TVS= 7] + 0.5 TVS,


After that, applying Newton's inethod yields

(46)


( 47)


(48)


where


k+l k+l k
6_ 7] - 0.5 T 6_ V = j 2 ,

k+l k k+l k k+l k+l


  • 6 E + Cl!} 6 1) + Cl rJ 6 [/ + CL l/ 6 Us


k = 0, 1, 2, ... ,


a= l/(1 - 1),


k k
f 1 f 2 = 0 for k > 0 ,

0 [) 0
j 2 = 1) - 17 + 0 ") T ( Us + Us ) ,

k k k k
.3 f = -E + E - g ( o1)(7] - 17),
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