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-   -   3d spray vs axisymmetric spray (dieselFoam) (http://www.cfd-online.com/Forums/openfoam/89003-3d-spray-vs-axisymmetric-spray-dieselfoam.html)

mfmohdyasin June 1, 2011 06:23

3d spray vs axisymmetric spray (dieselFoam)
 
Dear all,
I ran a 3d spray simulation in a cylindrical geometry using dieselFoam. No combustion. It ran fine and gave a satisfactory result.

Then I tried to simulate the same case using axisymmetric mesh with wedge BCs and 5deg wedge angle. I reduce the fuel mass flow rate by adjusting the "mass" in injectorProperties file to get the desired mfr as followed:
axisymmetric_mfr= 3d_mfr * 5/360

The log file gives a similar injection velocity as the 3d case:

"Average Velocity for injector 0: 27.1314 m/s, injection pressure = 3.90451 bar
Constructing two dimensional spray injection.Calculated angle of wedge is 5 deg."

However, when I did so, openFoam always complain with usual error message:

"attempt to use janafThermo<equationOfState> out of temperature range"

Has anyone seen similar situation?

Thanks,
Fairus

niklas June 1, 2011 07:00

in axisymmetric runs you dont have to adjust the mass, foam will do that for you.
just set the value it would have for a full 3d run.

mfmohdyasin June 1, 2011 10:56

Thanks Niklas,

Fairus

kmpang August 13, 2012 05:25

Hi Foamers,

I'm using OF 2.0.x. I'm trying to run the tutorial Aachen Bomb case but with a 4-degree, 2-D axisymmetry mesh. However, at half way through, I got this error message:

Evolving Spray


--> FOAM FATAL ERROR:
Hitting a wedge patch should not be possible.

From function void Foam::particle::hitWedgePatch(const wedgePolyPatch& wpp, TrackData&)
in file /home/kmpan/OpenFOAM/OpenFOAM-2.0.x/src/lagrangian/basic/lnInclude/particleTemplates.C at line 941.

FOAM aborting

#0 Foam::error::printStack(Foam::Ostream&) in "/home/kmpan/OpenFOAM/OpenFOAM-2.0.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#1 Foam::error::abort() in "/home/kmpan/OpenFOAM/OpenFOAM-2.0.x/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#2 void Foam::particle::hitWedgePatch<Foam::parcel::tracki ngData>(Foam::wedgePolyPatch const&, Foam::parcel::trackingData&) in "/home/kmpan/OpenFOAM/OpenFOAM-2.0.x/platforms/linux64GccDPOpt/lib/libdieselSpray.so"
#3 double Foam::particle::trackToFace<Foam::parcel::tracking Data>(Foam::Vector<double> const&, Foam::parcel::trackingData&) in "/home/kmpan/OpenFOAM/OpenFOAM-2.0.x/platforms/linux64GccDPOpt/lib/libdieselSpray.so"
#4 Foam::parcel::move(Foam::parcel::trackingData&, double) in "/home/kmpan/OpenFOAM/OpenFOAM-2.0.x/platforms/linux64GccDPOpt/lib/libdieselSpray.so"
.
.
.

Aborted

I guess using 'wedge' is the correct approach to produce the mesh but may I know if it's compatible with the diesel spray application?

Thanks in advance.

Best regards,
Pang.

kmpang August 13, 2012 17:47

Hi again,

I have found the solution based on this document:

http://www.dhcae-tools.com/images/dh...rcelSolver.pdf

There is a little difference in the compilation though. I navigated to the location "OpenFOAM-2.0.x/src/lagrangian" and use "./Allwmake", instead of using "wmake libso" at the location "OpenFOAM-2.0.x/src/lagrangian/basic". I think that such way is to update those diesel spray libraries (in dieselFoam) as well. Looking forward to someone to confirm with me, or to correct me. ;)

Regards,
Pang.

RJ87 November 5, 2013 00:17

I wondering if sprayFoam from OpenFoam 2.2.x has the same function of adjusting the mass like dieselFoam?

I found the adjustment codes in OpenFoam 1.6-ext. But I don't see that in sprayFoam in OpenFoam 2.2.x. Please correct me if i'm wrong. Anyway, any suggestion on how to introduce the correct mass with 2D sprayFoam case on O.F 2.2.x?


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