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turbulence study of an annular gap

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Old   August 6, 2018, 07:38
Default turbulence study of an annular gap
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Oliver Burkart
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Hi there,

I'm trying to use three different turbulence models for an annular gap:
- k-omega-SST
- realizable-k-epsilon
- SSG (Reynolds-Stress)

My goal is to show, that there is no big difference between these turbulence models after convergence. Here are some important facts about the flow:
Radius: 120 mm
delta p: 14 bar
Reynolds-Number: 31400
5000 rpm

Here is some information about my inlet-, wall- and outlet-conditions:

inlet: totalPressure
outlet: fixedValue
walls: zeroGradient

inlet: pressureDirectedInletVelocity
outlet: fluxCorrectedVelocity
wall1: noSlip
wall2: rotatingWallVelocity

inlet: turbulentIntensityKineticEnergyInlet
outlet: inletOutlet
walls: kqRWallFunction

inlet: calculated
walls: nutUSpaldingWallFunction

omega (for k-omega-SST-Model):
inlet: turbulentMixingLengthFrequencyInlet
outlet: inletOutlet
walls: omegaWallFunction

epsilon (for realizable-k-epsilon-model and SSG):
inlet: turbulentMixingLengthDissipationRateInlet
outlet: inletOutlet
walls: epsilonWallFunction

R (SSG):
inlet: fixedValue
outlet: inletOutlet
walls: kqRWallFunction

It would be really nice, im someone of you has an idea for which reasons my results are not similar. Is there any mistake in my BC's? Or what could be the reason for a big difference in forces?
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boundary conditions, k-omega-sst, realizable k-epsilon, ssg, turbulence

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