# What is the difference between fixedGradientFvPatchFields and fixedValueFvsPatchField

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 February 2, 2014, 03:28 What is the difference between fixedGradientFvPatchFields and fixedValueFvsPatchField #1 New Member   AJ Join Date: Sep 2013 Posts: 29 Rep Power: 5 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

 February 2, 2014, 08:01 #2 Senior Member     Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,254 Rep Power: 23 fixedGradient=Neumann, fixedValue=Dirichlet. __________________ *On twitter @akidTwit *Spend as much time formulating your questions as you expect people to spend on their answer.

 February 2, 2014, 09:03 #3 Senior Member   Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Deltares, Delft, The Netherlands Posts: 1,749 Rep Power: 29 In addition to this, the "Fv" boundary condition is for volume fields, whereas the "Fvs" boundary condition is for surface fields. Kind regards, Niels wyldckat and hua1015 like this. __________________ Please note that I do not use the Friend-feature, so do not be offended, if I do not accept a request.

 February 2, 2014, 09:55 #4 New Member   AJ Join Date: Sep 2013 Posts: 29 Rep Power: 5 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,

 February 2, 2014, 14:46 #5 Senior Member   Join Date: Jun 2011 Posts: 151 Rep Power: 8 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

 February 3, 2014, 10:33 #6 New Member   AJ Join Date: Sep 2013 Posts: 29 Rep Power: 5 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 ??

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