GALERKIN/FINITE ELEMENT METHODS FOR THE EQUATIONS OF ELASTODYNAMICS
Abstract
IN THIS WORK WE CONSIDER NUMERICAL METHODS FOR THE APPROXIMATION OF THE ELASTIC WAVE EQUATIONS (LINEAR AND NONLINEAR). WE DESCRETIZE THE SPACE VARIABLE USING FINITE ELEMENT METHODS. FOR THE DISCRETIZATION OF TIME VARIABLE WE USE SCHEMES THE CONSTRUCTION OF WHICH IS BASED ON RATIONAL APPROXIMATIONS OF COSINEAND EXPONENTIAL. THIS BECAUSE THE EQUATIONS OF THE ELASTODYNAMICS IS A HYPERBOLIC SYSTEM OF PARTIAL DIFFERENTIAL EQUATIONS. WE CONSTRUCT AND ANALYZE THEERROR OF STANDARD GALERKIN METHODS, MIXED METHODS FOR THE LINEAR EQUATIONS. WE STUDY THE PROBLEM OF CONSTRUCTION EFFECTIVE NUMERICAL METHODS FOR THE LINEAR EQUATIONS WITH ABSORBING BOUNDARY CONDITIONS. WE SHOW OPTIMER-ORDER ERROR ESTIMATES FOR NUMERICAL METHODS FOR THE NONLINEAR ELASTIC WAVE EQUATIONS.
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