units after multipl. with phi
 

Hi all,

I have an equation like that:

Solver that is used is rhoSimpleFoam - compressible. The unit of H is [J/kg]. Q has the unit [W/m³].

I had a look at the phi file and the file has the unit [kg/s]. Also I had a look at the createCompressiblePhi.H file and there is phi defined as the mass flow.

So after div(phi, H) I should get the unit [J/s] = [W] ...
Or am I wrong?

If phi = rho then everything would be nice :)
I am a bit confused.

Tobi

Could it be that you are missing the cell volume from the finite volume integration in your Q term?

phi = rho would still not solve your problem, because you're still missing [1/s] in that case.

Hi,

no its implemented in the flamelet tool from alberto.
He added an enthalpy defect like that:

where Qrad is calculated with

Like here: http://www.sandia.gov/TNF/radiation.html

Qrad [W/m³]
H [J/kg]

Well - but you `re right. There is still a s missing :/
I a m confused with taht code.

Hi Tobi,

Have a look at equation 2.29 in the Programmer's Guide.

Hi,
do you mean the libOpenSmoke Guide or what programmers guide do you mean?

Hi Tobias,
the folks at OpenCFD have discontinued Programmers Guide that is correct

but you can still find
http://openfoam-extend.git.sourcefor...de.pdf;hb=HEAD

HI,

thanks very much.
Thats that what I need :) integration over a volume V - now I know how that works.

Thought that the programmers-guide is only the doxygen-code :)
Nice to know.

Tobi

Perhaps it's good to know that you can also find it in your $WM_PROJECT_DIR/doc/Guides-a4 directory.

Nice to know.
Working with OF for 3 years now and be in that directory some times but never realized that :)

stupid!

but thanks!
tobi