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Old   April 3, 2014, 17:30
Default compressibleInterFoam - Jet Impingement BCs
Victor-S. Eberhart
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Hello Foamers!

I'm trying to simulate a non-submerged oil jet impingement on a flat plate with compressibleInterFoam. As turbulence model, kOmegaSST is used. It's a 2D axisymmetric problem, so I use cyclic boundary conditions on the FRONT and BACK patch. As shown in the attached sketch, I initialize the upper reservoir so that it is filled with oil which has a velocity Uy = -0.7 m/s which corresponds to the volumetric flow rate specified by the flowRateInletVelocity boundary condition. The other boundary conditions are defined as follows:

U | flowRateInletVelocity
p_rgh | zeroGradient
p | calculated
T | fixedValue
k | turbulentIntensityKineticEnergyInlet
omega | compressible::turbulentMixingLengthFrequencyInlet

U | zeroGradient
p_rgh | fixedFluxPressure
p | calculated
T | zeroGradient
k | zeroGradient
omega | zeroGradient

walls & bottom:
U | zeroGradient
p_rgh | fixedFluxPressure
p | calculated
T | fixedValue
k | fixedValue
omega | compressible::omegaWallFunction;

Well, after hours of simulation, I was glad seeing the oil phase flowing almost as expected. When looking at the velocity & k distributions, there are regions of high values outside oil jet which I did not expect. The region of high k values more or less stays at the same position over several time steps, the region of high velocity is moving up and down periodically.

I was wondering if it has someting to do with my boundary conditions. Maybe somebody has experience with something like that. Before I start 'playing' around with the fvSchemes file, I'd like to make sure it's not something more easier to fix ;-)

Thank you :)
Attached Images
File Type: jpg problem.jpg (11.9 KB, 19 views)
File Type: jpg oiljet_alpha.jpg (16.1 KB, 21 views)
File Type: jpg oiljet_U.jpg (21.4 KB, 21 views)
File Type: jpg oiljet_k.jpg (19.6 KB, 14 views)
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Old   April 4, 2014, 05:34
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You set a zeroGradient for the outlet velocity. This is clearly not true here. So
- extend the outlet enough that the zeroGradient is ok.
- try another BC: inletOutlet, ...

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