CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

kEpsilon vs kkLOmega RANS simulations

Register Blogs Community New Posts Updated Threads Search

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   October 4, 2022, 17:32
Default kEpsilon vs kkLOmega RANS simulations
  #1
Senior Member
 
Farzad Faraji
Join Date: Nov 2019
Posts: 206
Rep Power: 8
farzadmech is on a distinguished road
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
farzadmech is offline   Reply With Quote

Reply

Tags
kepsilon, kklomega, openfoam, rans, turbulence


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
RANS Grid Sensitivity Divergence on LES Grid MikeBravo Main CFD Forum 33 September 16, 2020 00:53
Confusion choosing between static / transient simulations TharunSK CFX 1 March 15, 2019 18:53
Can SU2-6.0.1 do RANS + Rotating Mesh simulations for helicopter rotors? (Bug?) adrisabate SU2 0 July 20, 2018 09:08
Source terms in epsilon equation (kEpsilon RANS) roadRunner OpenFOAM Programming & Development 6 April 21, 2015 11:09
Request for truth on VLES/Unsteady RANS Nick Georgiadis Main CFD Forum 16 September 1, 1999 17:43


All times are GMT -4. The time now is 13:05.