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April 19, 2014, 01:04 |
boudary condition for velocity component
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#1 |
New Member
Kai Liang
Join Date: Nov 2013
Posts: 19
Rep Power: 12 |
Hi, everyone;
I am using OpenFoam 2.2.0. Now, I have a top boundaryField in my 0/U file and I want to assign a zeroGradient boundary condition for Ux,Uy and a fixedValue for Uz. This is what I have considered : top { U.component(0) ( type zeroGradient; ) U.component(1) ( type zeroGradient; ) U.component(2) ( type fixedValue; value uniform 0; ) } But I am not sure whether it is right? Shall someone can confirm this or tell me the right way to do this? Thanks in advance for your help. Kai |
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April 19, 2014, 02:07 |
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#2 |
Senior Member
Niels Gjoel Jacobsen
Join Date: Mar 2009
Location: Copenhagen, Denmark
Posts: 1,900
Rep Power: 37 |
Hi Kai,
It looks like a slip boundary. Simply use "type slip;". Kind regards, Niels
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April 19, 2014, 02:27 |
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#3 |
New Member
Kai Liang
Join Date: Nov 2013
Posts: 19
Rep Power: 12 |
Thanks, Niels. I will try this slip boundary condition.
Best wishes! Kai |
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April 20, 2014, 04:25 |
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#4 |
Senior Member
Bobby
Join Date: Oct 2012
Location: Michigan
Posts: 454
Rep Power: 15 |
Dear Foamers
My computational domain is a cylinder containing three distinct inlet boundaries. One of the inlets is a swirl flow. In simple definition, my velocity file is as: Code:
boundaryField { outlet { type zeroGradient; } side { type zeroGradient; } bluffbody { type fixedValue; value uniform (0 0 0); } inletAir { type turbulentInlet; referenceField uniform (0 20 0); fluctuationScale (0.02 0.1 0.02); value uniform (0 20 0); } inletFuel { type turbulentInlet; referenceField uniform (0 32.7 0); fluctuationScale (0.04 0.2 0.04); value uniform (0 32.7 0); } inletSwirl { type swirlFlowRateInletVelocity; flowRate 0.0107; rpm 6632.42; value uniform (0 0 0); } } inlet_swirl { type cylindricalInletVelocity; axis (0 1 0); centre (0 0 0); axialVelocity 38.2; radialVelocity 0; rpm 6079.9; value uniform (0 0 0); } My question is: The velocity components in paraview are in cartesian coordinates or cylindrical coordinates by using cylindricalInletVelocity or not using it? Regards Bobi |
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