What is the difference between fixedGradientFvPatchFields and fixedValueFvsPatchField
 

when i was working with CHTmultiregion foam i came across fixedGradientFvPatchFields
and previously i was working with compressible TwophaseEuler Foam which had
fixedValueFvsPatchField

can anyone kindly explain me its difference

fixedGradient=Neumann, fixedValue=Dirichlet.

In addition to this, the "Fv" boundary condition is for volume fields, whereas the "Fvs" boundary condition is for surface fields.

Kind regards,

Niels

Thanks a lot, as i am planning to combine both the compressible two phase euler Foam and CHTis threre any method to domain decompose by Neumann–Dirichlet method in openfoam,

this BC is exist now
mixedFvPatchField boundary condition provides a base class for 'mixed' type boundary conditions, i.e. conditions that mix fixed value and patch-normal gradient conditions

thank you, i found the solvers using patches(especially in kinetic model of compressible euler foam) . i suppose it is used only in case when taking surface field into consideration(kindly correct me if i am wrong). So can this solver be developed by taking volume fields into consideration ??