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Creates a time-varying pressure gradient source. This code is based on the original pressureGradientExplicitSource but incorporating the DataEntry class is the same way as fixedTemperatureConstraint class.
pressureGradientExplicitSource sourc code: https://github.com/OpenFOAM/OpenFOAM-2.4.x/tree/master/src/fvOptions/sources/derived/pressureGradientExplicitSource
fixedTemperatureConstraint source code: https://github.com/OpenFOAM/OpenFOAM-2.4.x/tree/master/src/fvOptions/constraints/derived/fixedTemperatureConstraint
This modification is based on a discussion on CFD-online with Mr. Mahmoud Aboukhedr: http://www.cfd-online.com/Forums/openfoam-programming-development/153156-assigning-time-dependent-heat-source-terms.html#post557822
This code is not fully tested yet and should be used with caution!