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These discretizations need to be extended for general case which is not U itself but rather a function of U and its partial derivatives
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All the derivatives need to be modified near boundaries where some of needed points are missing
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NAS also adds a new numerical dissipation term to improve stability of numerical solution. Previously highest order derivative came from viscous terms like Ñ2U.
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New term is proportional to Ñ4U
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Note the negative sign which gives dissipation i.e. stability
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Equations (3.25) (3.26) and (3.27) summarize the equations after spatial and temporal discreization
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