# multiHoleInjector

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 September 25, 2010, 09:39 multiHoleInjector #1 New Member   fairus Join Date: Apr 2010 Posts: 20 Rep Power: 8 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

 September 25, 2010, 15:46 #2 Super Moderator     Niklas Nordin Join Date: Mar 2009 Location: Stockholm, Sweden Posts: 693 Rep Power: 21 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

 September 26, 2010, 07:53 #3 New Member   fairus Join Date: Apr 2010 Posts: 20 Rep Power: 8 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

September 26, 2010, 09:09
#4
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Niklas Nordin
Join Date: Mar 2009
Location: Stockholm, Sweden
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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
 angleSpacing.jpg (31.3 KB, 38 views)

 September 27, 2010, 13:45 #5 New Member   X.G. Li Join Date: Nov 2009 Location: Bremen, Germany Posts: 19 Rep Power: 8 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!

September 27, 2010, 15:48
#6
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Niklas Nordin
Join Date: Mar 2009
Location: Stockholm, Sweden
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Rep Power: 21
Quote:
 Originally Posted by CYMa 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!