# turbulence study of an annular gap

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 August 6, 2018, 07:38 turbulence study of an annular gap #1 New Member   Oliver Burkart Join Date: Aug 2018 Posts: 1 Rep Power: 0 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 incompressible Reynolds-Number: 31400 5000 rpm Here is some information about my inlet-, wall- and outlet-conditions: p: inlet: totalPressure outlet: fixedValue walls: zeroGradient U: inlet: pressureDirectedInletVelocity outlet: fluxCorrectedVelocity wall1: noSlip wall2: rotatingWallVelocity k: inlet: turbulentIntensityKineticEnergyInlet outlet: inletOutlet walls: kqRWallFunction nut: inlet: calculated outlet: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?

 Tags boundary conditions, k-omega-sst, realizable k-epsilon, ssg, turbulence

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