What is the difference between fixedGradientFvPatchFields and fixedValueFvsPatchField

Aj Nair · February 2, 2014, 02:28

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

akidess · February 2, 2014, 07:01

fixedGradient=Neumann, fixedValue=Dirichlet.

ngj · February 2, 2014, 08:03

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

Kind regards,

Niels

Aj Nair · February 2, 2014, 08:55

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,

mechy · February 2, 2014, 13:46

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

Aj Nair · February 3, 2014, 09:33

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 ??

February 2, 2014, 02:28	What is the difference between fixedGradientFvPatchFields and fixedValueFvsPatchField	#1
Aj Nair Member AJ Join Date: Sep 2013 Posts: 30 Rep Power: 12	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, 07:01		#2
akidess Senior Member Anton Kidess Join Date: May 2009 Location: Germany Posts: 1,377 Rep Power: 29	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, 08:03		#3
ngj Senior Member Niels Gjoel Jacobsen Join Date: Mar 2009 Location: Copenhagen, Denmark Posts: 1,900 Rep Power: 37	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, 08:55		#4
Aj Nair Member AJ Join Date: Sep 2013 Posts: 30 Rep Power: 12	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, 13:46		#5
mechy Senior Member Join Date: Jun 2011 Posts: 163 Rep Power: 14	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, 09:33		#6
Aj Nair Member AJ Join Date: Sep 2013 Posts: 30 Rep Power: 12	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 ??