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Both problems are coupled systems of second order partial differential equations
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Both can involve solution of metaproblems -- coupling between different systems of equations
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In CFD, Metaproblems seen in Multidisciplinary Analysis and Design
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in NR, Metaproblem seen in coupling of constraint and evolution equations
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Both problems require numerical experimentation to develop working codes
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Many unsolved issues requiring new physics insight implemented well numerically
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One cannot specify today the "right" approach to CFD or NR
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Both problems have elliptic and hyperbolic equations
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Similarities suggest we develop a toolkit applicable for either or both applications
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