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<!-- --- title: User Upgrade Guide (OpenFOAM-v1712) -->
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[Back to Upgrade Guides](/guides/upgrade/upgrade)
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## Solver
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### chtMultiRegion solvers
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`system/fvSolution` file is now mandatory
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## Input dictionaries
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Special treatment for the dictionary `include` keyword has was removed after being deprecated many versions ago.
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## Utilities
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### applyBoundaryLayer
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Writing the turbulence viscosity field nut is now optional via the option -write-nut
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### noise
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Power of 2 data samples constraint was removed
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## Function objects
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`secondaryWrite` option in the `system/controlDict` superseded by the `writeObject` function object. |