SNAFU at wwwopencfdcouk on solver page

platopus · March 30, 2008, 17:08

I'm no expert, but shouldn't the second occurrence of the Greek letter rho in the mathematical equation at

http://www.opencfd.co.uk/openfoam/cr...reatingSolvers

be instead a Greek letter phi to match the solver code below it on the page?

Regards.

dmoroian · March 31, 2008, 02:31

Hi Graeme,
The convective term can formally be written:

div(rUU) = div((rU)U) = div(fU) = fvm::div(phi,U)

So both, the mathematical expression and the c++ translation of it are correct in the aforementioned webpage.

platopus · March 31, 2008, 03:42

Hi Dragos,

I confess that I don't know enough to follow that completely, but I'll take your word for it.

Regards, Graeme.

dmoroian · March 31, 2008, 04:48

You don't need to know Fluid Mechanics for that, it is just a replacement: f = rU
Nothing more!

platopus · March 31, 2008, 05:51

So here, phi is a functor representing rU ?

dmoroian · March 31, 2008, 06:14

Yes it is.

platopus · March 31, 2008, 07:27

Thanks for taking the time to reply, Dragos.

Regards, Graeme.

dmoroian · March 31, 2008, 07:34

I hope you will like OpenFOAM more and more, and enjoy the discussions on this forum.

Dragos

March 30, 2008, 17:08	I'm no expert, but shouldn't t	#1
platopus Member Graeme Cottrell Join Date: Mar 2009 Posts: 30 Rep Power: 17	I'm no expert, but shouldn't the second occurrence of the Greek letter rho in the mathematical equation at http://www.opencfd.co.uk/openfoam/cr...reatingSolvers be instead a Greek letter phi to match the solver code below it on the page? Regards.

March 31, 2008, 02:31	Hi Graeme, The convective ter	#2
dmoroian Senior Member Dragos Join Date: Mar 2009 Posts: 648 Rep Power: 20	Hi Graeme, The convective term can formally be written: div(rUU) = div((rU)U) = div(fU) = fvm::div(phi,U) So both, the mathematical expression and the c++ translation of it are correct in the aforementioned webpage.

March 31, 2008, 03:42	Hi Dragos, I confess that I	#3
platopus Member Graeme Cottrell Join Date: Mar 2009 Posts: 30 Rep Power: 17	Hi Dragos, I confess that I don't know enough to follow that completely, but I'll take your word for it. Regards, Graeme.

March 31, 2008, 04:48	You don't need to know Fluid M	#4
dmoroian Senior Member Dragos Join Date: Mar 2009 Posts: 648 Rep Power: 20	You don't need to know Fluid Mechanics for that, it is just a replacement: f = rU Nothing more!

March 31, 2008, 05:51	So here, phi is a functor repr	#5
platopus Member Graeme Cottrell Join Date: Mar 2009 Posts: 30 Rep Power: 17	So here, phi is a functor representing rU ?

March 31, 2008, 06:14	Yes it is.	#6
dmoroian Senior Member Dragos Join Date: Mar 2009 Posts: 648 Rep Power: 20	Yes it is.

March 31, 2008, 07:27	Thanks for taking the time to	#7
platopus Member Graeme Cottrell Join Date: Mar 2009 Posts: 30 Rep Power: 17	Thanks for taking the time to reply, Dragos. Regards, Graeme.

March 31, 2008, 07:34	I hope you will like OpenFOAM	#8
dmoroian Senior Member Dragos Join Date: Mar 2009 Posts: 648 Rep Power: 20	I hope you will like OpenFOAM more and more, and enjoy the discussions on this forum. Dragos

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