Copyright © 2006 The McGraw-Hill Companies, Inc. Permission required for reproduction or display. by Lale Yurttas, Texas A&M University Part 81 Partial.

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Copyright © 2006 The McGraw-Hill Companies, Inc. Permission required for reproduction or display. by Lale Yurttas, Texas A&M University Part 81 Partial Differential Equations Table PT8.1

Copyright © 2006 The McGraw-Hill Companies, Inc. Permission required for reproduction or display. by Lale Yurttas, Texas A&M University Chapter 292 Finite Difference: Elliptic Equations Chapter 29 Solution Technique Elliptic equations in engineering are typically used to characterize steady-state, boundary value problems. For numerical solution of elliptic PDEs, the PDE is transformed into an algebraic difference equation. Because of its simplicity and general relevance to most areas of engineering, we will use a heated plate as an example for solving elliptic PDEs.

Copyright © 2006 The McGraw-Hill Companies, Inc. Permission required for reproduction or display. by Lale Yurttas, Texas A&M University Chapter 293 Figure 29.3

Copyright © 2006 The McGraw-Hill Companies, Inc. Permission required for reproduction or display. by Lale Yurttas, Texas A&M University Chapter 29 The Laplacian Difference Equations/ Laplacian difference equation. Holds for all interior points Laplace Equation O[  (x) 2 ] O[  (y) 2 ]

Copyright © 2006 The McGraw-Hill Companies, Inc. Permission required for reproduction or display. by Lale Yurttas, Texas A&M University Chapter 295 Figure 29.4

Copyright © 2006 The McGraw-Hill Companies, Inc. Permission required for reproduction or display. by Lale Yurttas, Texas A&M University Chapter 296 In addition, boundary conditions along the edges must be specified to obtain a unique solution. The simplest case is where the temperature at the boundary is set at a fixed value, Dirichlet boundary condition. A balance for node (1,1) is: Similar equations can be developed for other interior points to result a set of simultaneous equations.

Copyright © 2006 The McGraw-Hill Companies, Inc. Permission required for reproduction or display. by Lale Yurttas, Texas A&M University Chapter 297 The result is a set of nine simultaneous equations with nine unknowns:

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