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Forum: OpenFOAM

June 9, 2011, 01:32

Replies: 22

DU/DT value?

Views: 4,318

Posted By maysmech

DDtU=>m/s2 ddt(U)=>m/s2 div(phi,U)=>...

DDtU=>m/s2

ddt(U)=>m/s2

div(phi,U)=> m3/(s2)

div(phi)*U=> m3/(s2)

All of these four phrases should have same dimension, shouldn't they?

Forum: OpenFOAM

June 8, 2011, 16:21

Replies: 22

DU/DT value?

Views: 4,318

Posted By maysmech

Ok, you mean it is not equal to what user guide...

Ok, you mean it is not equal to what user guide wrote for phi. Maybe this is another phi.

But what is your idea about dimensional problem of DDtU?

Forum: OpenFOAM

June 8, 2011, 14:45

Replies: 22

DU/DT value?

Views: 4,318

Posted By maysmech

i wrote above post because of: ...

i wrote above post because of:
http://www.openfoam.com/docs/user/fvSchemes.php#x20-1120004.4.5

But phi which is written in time folders has this dimension: [0 3 -1 0 0 0 0]
And with this...

Forum: OpenFOAM

June 7, 2011, 03:17

Replies: 22

DU/DT value?

Views: 4,318

Posted By maysmech

DDtU = fvc::ddt(U) + fvc::div(phi, U)...

DDtU = fvc::ddt(U) + fvc::div(phi, U) - fvc::div(phi)*U

As it is stated in User guide phi=rho*U
So it has problem in dimension.

DDtU=>m/s2

ddt(U)=>m/s2
...

Forum: OpenFOAM

June 6, 2011, 15:58

Replies: 22

DU/DT value?

Views: 4,318

Posted By maysmech

Thanks Nima and Gregor The problem is solved...

Thanks Nima and Gregor
The problem is solved by:
volVectorField DDtU
(
IOobject
(
"DDtU",
runTime.timeName(),
mesh,
...

Forum: OpenFOAM

June 6, 2011, 05:44

Replies: 22

DU/DT value?

Views: 4,318

Posted By maysmech

Hi and thanks Gregor I didn't find its format...

Hi and thanks Gregor
I didn't find its format for vevtor DDtU with dimension [0 1 -2 0 0 0]. Do you know it?
Another question for Alberto:

Are you mean DDt(rho*U)? because phi=rho*U and i think...

Forum: OpenFOAM

June 6, 2011, 01:44

Replies: 22

DU/DT value?

Views: 4,318

Posted By maysmech

Thanks :) it is my first openFoam programming...

Thanks :)
it is my first openFoam programming and it was the cause of my silly questions. ;)
Now i have a scientific question. first i describe my works:

1- Copying pisoFoam to new folder...

Forum: OpenFOAM

June 4, 2011, 10:59

Replies: 22

DU/DT value?

Views: 4,318

Posted By maysmech

Dear Alberto, Thanks for your answer. Is it...

Dear Alberto,
Thanks for your answer.
Is it possible to describe more.
Where should i write this code?
What is steps for writing process in time folders?
Is it need to define DDT in folder 0?...

Forum: OpenFOAM

June 4, 2011, 04:27

Replies: 22

DU/DT value?

Views: 4,318

Posted By maysmech

Thanks Nima, When i switch from Euler to...

Thanks Nima,

When i switch from Euler to CrancNicholson in fvScheme, ddt0(U) and ddt0(phi) are Written in time folders.

Now, my questions are:

1- is this value equal to D/DT(U)? if no How...

Forum: OpenFOAM

June 1, 2011, 02:40

Replies: 22

DU/DT value?

Views: 4,318

Posted By maysmech

DU/DT value?

Hi,

I need DU/Dt values for all grids.

How can i calculate and write this parameter.

Any suggestion will be appreciated.

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