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Old   September 25, 2010, 09:39
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fairus
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Dear all,
Does anyone know what xyAngle, zAngle and umbrellaAngle in multiHoleInjectorProps dictionary below mean?
Is the 'direction' not required? Then how the injection direction is determined?

multiHoleInjectorProps
{
position (0.0097 0.028 0.01);

xyAngle 0;
zAngle 180.0;
nHoles 4;
umbrellaAngle 120.0;
nozzleTipDiameter 1e-3;
angleSpacing
(
0.0
22.5
22.5
20.0
);


Thanks in advance,
Fairus
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Old   September 25, 2010, 15:46
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Niklas Nordin
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http://openfoamwiki.net/index.php/Co...ctorProperties

The direction of the injecor is defined via the xy and z angles.
The spray is injected around this direction with the umbrellaAngle
spread around the full circle with the angleSpacing angles
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Old   September 26, 2010, 07:53
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fairus
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Niklas,
Thanks for the reply.
I would like to set the injection direction to be in +z direction. With unitInjector, I will set: direction (0 0 1);
How can I do the same with multiHoleInjector? I can set zAngle = 0, but I've to specify a value for xyAngle, which makes the direction to be not purely in +z direction.

One more, Is there any relationship between umbrellaAngle and innerConeAngle/outerConeAngle which is in the hollowConeInjectorCoeffs dictionary? Graphical explanation will be highly appreciated.

Best,
Fairus
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Old   September 26, 2010, 09:09
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Niklas Nordin
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if you set zAngle to 0 (or 180) the value of xyAngle wont matter.

The umbrellaAngle is the angle between the individual sprays along the injector-direction.
The inner/outer cone angles are the angles of an individual spray.

angleSpacing is the angles between the spray centerlines in the plane perpendicular to the injector-direction.
Attached Images
File Type: jpg angleSpacing.jpg (31.3 KB, 37 views)
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Old   September 27, 2010, 13:45
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X.G. Li
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Hallo, Niklas

I use the rhoPisoTwinParcelFoam to investigate a particle-laden gas flow.
I want to calculate the total particle number across a cell surface in certain time.
And then I can get a particle flux for this cell face by N/(t*A),
N, the total particle number across the cell surface;
t, time;
A, cell surface area.

I have poor knowledge about C++.
May you give me some help?

Thank you very much!
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Old   September 27, 2010, 15:48
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Niklas Nordin
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Quote:
Originally Posted by CYMa View Post
Hallo, Niklas

I use the rhoPisoTwinParcelFoam to investigate a particle-laden gas flow.
I want to calculate the total particle number across a cell surface in certain time.
And then I can get a particle flux for this cell face by N/(t*A),
N, the total particle number across the cell surface;
t, time;
A, cell surface area.

I have poor knowledge about C++.
May you give me some help?

Thank you very much!
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