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Henry Weller authored
The operation can be applied to any volume or surface fields generating a volume or surface scalar field. Example of function object specification: \verbatim Ttot { type add; libs ("libfieldFunctionObjects.so"); fields (T Tdelta); result Ttot; executeControl writeTime; writeControl writeTime; } \endverbatim Also refactored functionObjects::fieldsExpression to avoid code duplication between the 'add' and 'subtract' functionObjects.
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