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# The implementation of lax theorem can also be used in

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Unformatted text preview: in order to show the convergence as both explicit and implicit schemes are linear. We will discuss the stability of explicit scheme using Neumann approach. On the same lines, the stability of implicit scheme can also be proved. However, the solution by FD, when there is discontinuity in the initial conditions, is not accurate as the propagation of discontinuity problem in the stability. However, the problem with no discontinuities can be solved satisfactorily & efficiently by convergent and stable FD methods with rectangular grids. 2u 2u , t 2 x 2 Example: Solve the wave equation- 0 x 1, t0 using Implicit Method subject to the conditions: u (0, t ) 0 u (1, t ) u ( x, 0) 0 t u ( x, 0) Cos x, Solution: By implicit method, equation is given by +(1+ , ) , = , + +( 1 , ) + (2 , ) , + , + , , Putting r = 1/2 ⇒ + , – , , = , + , , - + , + + , (1) , B.C. u(0, t) = 0 = u(1, t) ⇒ u(0, 1) = u(0, 2) = u(0, 3) = …. = 0 = u(0, 0) & u(5, 0) = u(5, 1) = u(5, 2...
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