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Forum: OpenFOAM Programming & Development August 23, 2013, 00:08
Replies: 35
Views: 12,219
Posted By sharonyue
U make it very very clear, Thanks very much. So I...

U make it very very clear, Thanks very much. So I just make it a example.:

1. volVectorField U;
fvc::div(U);

2. volVectorField U;
phi = U & mesh.Sf();
fvc::div(phi);

So these...
Forum: OpenFOAM Programming & Development July 18, 2013, 18:46
Replies: 35
Views: 12,219
Posted By sharonyue
Yeah, Im very clear about this...

Yeah, Im very clear about this \nabla\cdot\vec{u}, and I know after intergral it can be a sum. I dont know whether you know what I dont know.

fvScalarMatrix pEqn
(
...
Forum: OpenFOAM Programming & Development July 17, 2013, 23:52
Replies: 35
Views: 12,219
Posted By sharonyue
Im still confused!!!!!! div(u)=0 I know its...

Im still confused!!!!!!

div(u)=0 I know its meaning.

1) If via continuity, we have div(phi)=0, then we make an intergration on this equation like this:


\[\int\limits_v {div(phi)} dV =...
Forum: OpenFOAM Programming & Development July 16, 2013, 10:23
Replies: 35
Views: 12,219
Posted By sharonyue
Bernhard, Thanks very very much for your...

Bernhard, Thanks very very much for your consistent help, But I still cannot understand this "div(u)=0" turns into "div(phi)=0" in OpenFOAM, even mathematicly div(vector) works but div(scalar) not. ...
Forum: OpenFOAM Programming & Development July 16, 2013, 09:56
Replies: 35
Views: 12,219
Posted By sharonyue
\int\limits_V^{} {\nabla \cdot udV} =...

\int\limits_V^{} {\nabla \cdot udV} = \sum\limits_f {{u_f} \cdot {S_f} = 0}

Regarding this, if div(phi)=0 Do you mean:
\int\limits_V^{} {u_f \cdot S_fdV} = 0

Is there any difference between...
Forum: OpenFOAM Programming & Development July 16, 2013, 09:24
Replies: 35
Views: 12,219
Posted By sharonyue
\int\limits_V^{} {\nabla \cdot udV} =...

\int\limits_V^{} {\nabla \cdot udV} = \sum\limits_f {{u_f} \cdot {S_f} = 0}

I know this, but phi is a scalar, what is div(scalar).....

Felipe. Yeah, you are right~
Forum: OpenFOAM Programming & Development July 16, 2013, 08:44
Replies: 35
Views: 12,219
Posted By sharonyue
I mean all the books say from continuity we have:...

I mean all the books say from continuity we have: \nabla \cdot u=0 without mentioning whether its cell centre value or the face value. But Im sure I confused about this. So?
Forum: OpenFOAM Programming & Development July 16, 2013, 08:38
Replies: 35
Views: 12,219
Posted By sharonyue
Hi Bernhard, Could you explain more?

Hi Bernhard,
Could you explain more?
Forum: OpenFOAM Programming & Development July 16, 2013, 08:31
Replies: 35
Views: 12,219
Posted By sharonyue
Hi Felipre, Thanks for your prompt reply, ...

Hi Felipre,

Thanks for your prompt reply,
regarding this, isnt it should be div(u)=0?
Forum: OpenFOAM Programming & Development July 16, 2013, 04:01
Replies: 35
Views: 12,219
Posted By sharonyue
Hi Kim, This problem happens to me in the...

Hi Kim,

This problem happens to me in the same time!http://www.cfd-online.com/Forums/openfoam-programming-development/120786-icofoams-pressure-possion-equation.html Did you find a solution?
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