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kEpsilon vs kkLOmega RANS simulations

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Old   October 4, 2022, 17:32
Default kEpsilon vs kkLOmega RANS simulations
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Farzad Faraji
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Hello all
I want to use kkLOmega instead of kEpsilon for my RANS turbulent model since kkLOmega can capture transition between laminar to turbulence and my case is laminar in most of the geometry. Using kEpsilon, I can run the simulation without any problem, and in the other hand when I want to use kkLOmega, I get below output and code diverges;

Code:
surfaceFieldValue CCAaverageWallShearStresses:
    total faces  = 80800
    total area   = 0.000424686


wallShearStress wallShearStress1 write:
    writing object wallShearStress
    min/max(Artery_CCAwall) = (-0.0940689 0 -0.0936459), (0.0903153 0.00531667 0.0936459)
    min/max(Artery_ICAwall) = (-0.0651761 -0 -0.0651761), (0.0652406 0.00980282 0.0652406)
    min/max(Artery_ECAwall) = (0 0 0), (0 0 0)
    min/max(Artery_CCAin) = (-0.143562 0.0864451 -0.143553), (0.137284 0.358887 0.143553)
    min/max(Artery_ICAout) = (-0.0157779 0.0636099 -0.015537), (0.015537 0.268776 0.015537)
    min/max(Artery_ECAout) = (0 0 0), (0 0 0)

Time = 1

smoothSolver:  Solving for Ux, Initial residual = 1, Final residual = 0.053834, No Iterations 2
smoothSolver:  Solving for Uy, Initial residual = 1, Final residual = 0.0586568, No Iterations 2
smoothSolver:  Solving for Uz, Initial residual = 1, Final residual = 0.0518649, No Iterations 2
GAMG:  Solving for p, Initial residual = 1, Final residual = 0.0514959, No Iterations 10
GAMG:  Solving for p, Initial residual = 0.0671865, Final residual = 0.0017498, No Iterations 2
time step continuity errors : sum local = 3.54849, global = 0.043344, cumulative = 0.043344
Why continuity errors happens and what should I do?

Thanks,
Farzad
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kepsilon, kklomega, openfoam, rans, turbulence

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