y+ and u+ values with low-Re RANS turbulence models: utility + testcase

Joanna Huang · February 14, 2013, 08:28

Quote:

Originally Posted by aljazari

I just ran this case using Allrun, then ran yPlus -latestTime, it went fine.

It didn't work the first time because the file "turbulenceProperties" was not found. I have no idea how the simulation worked without it. By including this file, yPlus worked with no problems.

Code:

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.1.1                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      turbulenceProperties;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
simulationType  RASModel;
 
 
// ************************************************************************* //

yPlus-latestTime

Code:

/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.1.1                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 2.1.1-221db2718bbb
Exec   : yPlus -latestTime
Date   : Jan 07 2013
Time   : 17:12:58
Host   : "p150"
PID    : 11118
Case   : /home/abdulhaq/OpenFOAM/abdulhaq-2.1.1/run/tutorials/incompressible/simpleFoam/motorBike
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Disallowing user-supplied system call operations
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time
 
Create mesh for time = 500
 
Time = 500
Calculating wall distance
 
Writing wall distance to field y
 
Reading field U
 
Reading/calculating face flux field phi
 
Selecting incompressible transport model Newtonian
Selecting turbulence model type RASModel
Selecting RAS turbulence model kOmegaSST
kOmegaSSTCoeffs
{
    alphaK1         0.85034;
    alphaK2         1;
    alphaOmega1     0.5;
    alphaOmega2     0.85616;
    gamma1          0.5532;
    gamma2          0.4403;
    beta1           0.075;
    beta2           0.0828;
    betaStar        0.09;
    a1              0.31;
    c1              10;
}
 
Patch 3 named lowerWall
 d  : min: 0.000397575 max: 0.112139 average: 0.0112107
 y+ : min: 3.1981 max: 1512.07 average: 120.613
 
Patch 5 named motorBike_frt-fairing:001%1
 d  : min: 0.000268932 max: 0.0140758 average: 0.00364481
 y+ : min: 1.38902 max: 742.058 average: 128.173
 
Patch 6 named motorBike_windshield:002%2
 d  : min: 0.000430623 max: 0.00514934 average: 0.00220496
 y+ : min: 6.71703 max: 181.397 average: 94.8434
 
Patch 7 named motorBike_rr-wh-rim:005%5
 d  : min: 0.000326252 max: 0.0118033 average: 0.00415699
 y+ : min: 2.63874 max: 500.176 average: 115.064
 
Patch 8 named motorBike_rr-wh-rim:010%10
 d  : min: 0.000327294 max: 0.0115265 average: 0.00661764
 y+ : min: 2.88247 max: 599.602 average: 190.942
 
Patch 9 named motorBike_fr-wh-rim:011%11
 d  : min: 0.0023297 max: 0.0119296 average: 0.00677875
 y+ : min: 36.5513 max: 545 average: 223.732
 
Patch 10 named motorBike_fr-wh-brake-disk:012%12
 d  : min: 0.00284218 max: 0.0120569 average: 0.00762753
 y+ : min: 28.1762 max: 504.851 average: 243.077
 
Patch 11 named motorBike_frame:016-shadow%13
 d  : min: 0.000390573 max: 0.014721 average: 0.00620935
 y+ : min: 6.03975 max: 680.548 average: 223.03
 
Patch 12 named motorBike_rear-susp:014%14
 d  : min: 0.000280177 max: 0.012389 average: 0.00399244
 y+ : min: 1.01297 max: 528.538 average: 59.9596
 
Patch 13 named motorBike_rear-susp:014-shadow%15
 d  : min: 0.000306696 max: 0.0128792 average: 0.00373295
 y+ : min: 1.12489 max: 417.635 average: 57.7303
 
Patch 14 named motorBike_frame:016%16
 d  : min: 0.000362031 max: 0.0151413 average: 0.00555179
 y+ : min: 5.3446 max: 648.579 average: 202.398
 
Patch 15 named motorBike_rr-wh-rim:005-shadow%17
 d  : min: 0.000328156 max: 0.0118508 average: 0.0043253
 y+ : min: 3.76975 max: 495.027 average: 120.949
 
Patch 16 named motorBike_rr-wh-chain-hub:022%22
 d  : min: 0.0026924 max: 0.0112263 average: 0.00619253
 y+ : min: 33.3899 max: 528.787 average: 169.589
 
Patch 17 named motorBike_rearseat%24
 d  : min: 0.000355204 max: 0.0129121 average: 0.00357538
 y+ : min: 4.37037 max: 592.86 average: 125.88
 
Patch 18 named motorBike_frt-fairing%25
 d  : min: 0.000288805 max: 0.0124963 average: 0.0032173
 y+ : min: 1.6081 max: 559.374 average: 120.952
 
Patch 19 named motorBike_windshield%26
 d  : min: 0.000327636 max: 0.0121903 average: 0.00318627
 y+ : min: 2.67853 max: 491.891 average: 109.613
 
Patch 20 named motorBike_headlights%27
 d  : min: 0.00033471 max: 0.00865439 average: 0.00208301
 y+ : min: 4.35855 max: 252.623 average: 85.2525
 
Patch 21 named motorBike_driversseat%28
 d  : min: 0.000305473 max: 0.0124167 average: 0.00515002
 y+ : min: 0.914448 max: 386.061 average: 108.287
 
Patch 22 named motorBike_rear-body%29
 d  : min: 0.000292051 max: 0.0138328 average: 0.00451681
 y+ : min: 1.30529 max: 668.102 average: 109.362
 
Patch 23 named motorBike_fuel-tank%30
 d  : min: 0.000271334 max: 0.0136267 average: 0.00280589
 y+ : min: 1.14045 max: 348.381 average: 61.4069
 
Patch 24 named motorBike_exhaust%31
 d  : min: 0.000274933 max: 0.0146777 average: 0.00556152
 y+ : min: 1.52015 max: 693.262 average: 142.121
 
Patch 25 named motorBike_rr-wh-rim%32
 d  : min: 0.00030843 max: 0.0137104 average: 0.00350059
 y+ : min: 0.650911 max: 510.374 average: 78.4556
 
Patch 26 named motorBike_fr-mud-guard%33
 d  : min: 0.000303715 max: 0.0147352 average: 0.0047335
 y+ : min: 2.22657 max: 681.515 average: 144.748
 
Patch 27 named motorBike_fr-wh-rim%34
 d  : min: 0.00207944 max: 0.0125446 average: 0.00642802
 y+ : min: 13.0476 max: 553.624 average: 184.083
 
Patch 28 named motorBike_fr-wh-brake-disk%35
 d  : min: 0.000289026 max: 0.0130605 average: 0.00431061
 y+ : min: 1.66993 max: 600.062 average: 132.527
 
Patch 29 named motorBike_fr-brake-caliper%36
 d  : min: 0.00222925 max: 0.0133883 average: 0.00812573
 y+ : min: 23.8092 max: 525.755 average: 230.996
 
Patch 30 named motorBike_fr-wh-tyre%37
 d  : min: 0.000351147 max: 0.0128806 average: 0.00646112
 y+ : min: 3.27931 max: 699.639 average: 224.714
 
Patch 31 named motorBike_hbars%38
 d  : min: 0.00224132 max: 0.0150466 average: 0.00752225
 y+ : min: 19.7341 max: 794.713 average: 259.965
 
Patch 32 named motorBike_fr-forks%39
 d  : min: 0.00210806 max: 0.0161755 average: 0.00715355
 y+ : min: 11.4949 max: 719.727 average: 256.833
 
Patch 33 named motorBike_chain%40
 d  : min: 0.000361469 max: 0.016935 average: 0.00941252
 y+ : min: 6.89163 max: 705.813 average: 264.784
 
Patch 34 named motorBike_rr-wh-tyre%41
 d  : min: 0.000326759 max: 0.0145594 average: 0.00315657
 y+ : min: 1.84505 max: 714.16 average: 100.195
 
Patch 35 named motorBike_square-dial%42
 d  : min: 0.00394236 max: 0.0087235 average: 0.0063372
 y+ : min: 127.826 max: 257.126 average: 192.043
 
Patch 36 named motorBike_round-dial%43
 d  : min: 0.00475714 max: 0.0119439 average: 0.00785584
 y+ : min: 142.534 max: 345.877 average: 229.736
 
Patch 37 named motorBike_dial-holder%44
 d  : min: 0.00256609 max: 0.016704 average: 0.00648968
 y+ : min: 9.52715 max: 450.862 average: 123.603
 
Patch 38 named motorBike_rear-susp%45
 d  : min: 0.000282067 max: 0.0149661 average: 0.00578968
 y+ : min: 0.928264 max: 672.979 average: 161.333
 
Patch 39 named motorBike_rear-brake-lights%46
 d  : min: 0.00220472 max: 0.0152285 average: 0.00747612
 y+ : min: 8.98794 max: 213.055 average: 92.0237
 
Patch 40 named motorBike_rear-light-bracket%47
 d  : min: 0.000347537 max: 0.0117151 average: 0.00487275
 y+ : min: 2.40855 max: 269.656 average: 72.6323
 
Patch 41 named motorBike_frame%48
 d  : min: 0.000277013 max: 0.0141278 average: 0.00438018
 y+ : min: 0.86809 max: 700.369 average: 123.249
 
Patch 42 named motorBike_rear-mud-guard%49
 d  : min: 0.000320764 max: 0.0136426 average: 0.00384965
 y+ : min: 2.19329 max: 557.792 average: 105.802
 
Patch 43 named motorBike_rear-susp-spring-damp%50
 d  : min: 0.00198034 max: 0.0125607 average: 0.00641261
 y+ : min: 5.82302 max: 329.074 average: 85.663
 
Patch 44 named motorBike_fairing-inner-plate%51
 d  : min: 0.000285014 max: 0.0120323 average: 0.0041921
 y+ : min: 2.07677 max: 476.768 average: 97.1625
 
Patch 45 named motorBike_clutch-housing%52
 d  : min: 0.000271344 max: 0.0130613 average: 0.00312992
 y+ : min: 0.830421 max: 611.69 average: 79.8648
 
Patch 46 named motorBike_radiator%53
 d  : min: 0.00374399 max: 0.0202953 average: 0.0104274
 y+ : min: 55.7322 max: 709.455 average: 377.254
 
Patch 47 named motorBike_water-pipe%54
 d  : min: 0.00159212 max: 0.0143308 average: 0.00883537
 y+ : min: 32.0802 max: 762.355 average: 299.535
 
Patch 48 named motorBike_water-pump%55
 d  : min: 0.00297517 max: 0.012476 average: 0.00692214
 y+ : min: 4.92335 max: 262.53 average: 108.687
 
Patch 49 named motorBike_engine%56
 d  : min: 0.000306856 max: 0.0148045 average: 0.00332984
 y+ : min: 0.82158 max: 772.277 average: 89.4703
 
Patch 50 named motorBike_rear-shock-link%57
 d  : min: 0.00419348 max: 0.0141306 average: 0.00752708
 y+ : min: 20.9748 max: 254.993 average: 123.762
 
Patch 51 named motorBike_rear-brake-fluid-pot-bracket%58
 d  : min: 0.000339113 max: 0.0124309 average: 0.00418814
 y+ : min: 2.10608 max: 373.013 average: 65.2629
 
Patch 52 named motorBike_rear-brake-fluid-pot%59
 d  : min: 0.00273476 max: 0.0141282 average: 0.0083839
 y+ : min: 36.6767 max: 200.626 average: 123.659
 
Patch 53 named motorBike_footpeg%60
 d  : min: 0.00250189 max: 0.0133891 average: 0.00802141
 y+ : min: 19.6311 max: 670.721 average: 284.097
 
Patch 54 named motorBike_rr-wh-chain-hub%61
 d  : min: 0.000360962 max: 0.0115398 average: 0.005402
 y+ : min: 3.1775 max: 524.782 average: 146.742
 
Patch 55 named motorBike_rear-brake-caliper%62
 d  : min: 0.000357519 max: 0.013734 average: 0.00643976
 y+ : min: 5.35867 max: 768.159 average: 294.679
 
Patch 56 named motorBike_rider-helmet%65
 d  : min: 0.000303999 max: 0.0142727 average: 0.00289369
 y+ : min: 2.85383 max: 744.973 average: 124.842
 
Patch 57 named motorBike_rider-visor%66
 d  : min: 0.000910223 max: 0.00908061 average: 0.00246434
 y+ : min: 46.2841 max: 365.14 average: 158.312
 
Patch 58 named motorBike_rider-boots%67
 d  : min: 0.000271891 max: 0.01308 average: 0.00379892
 y+ : min: 1.56582 max: 648.84 average: 154.276
 
Patch 59 named motorBike_rider-gloves%68
 d  : min: 0.00228877 max: 0.0150876 average: 0.00731412
 y+ : min: 23.4853 max: 618.235 average: 208.937
 
Patch 60 named motorBike_rider-body%69
 d  : min: 0.000276985 max: 0.0129954 average: 0.00327886
 y+ : min: 0.846533 max: 790.118 average: 102.37
 
Patch 61 named motorBike_frame:0%70
 d  : min: 0.000351371 max: 0.0105157 average: 0.00345257
 y+ : min: 2.68923 max: 344.934 average: 102.693
 
Patch 62 named motorBike_frt-fairing:001-shadow%74
 d  : min: 0.000277253 max: 0.0139939 average: 0.00357307
 y+ : min: 1.44804 max: 662.019 average: 122.051
 
Patch 63 named motorBike_windshield-shadow%75
 d  : min: 0.000342722 max: 0.00956641 average: 0.00318237
 y+ : min: 3.87715 max: 376.309 average: 104.55
 
Patch 64 named motorBike_fr-mud-guard-shadow%81
 d  : min: 0.000328392 max: 0.012176 average: 0.00430565
 y+ : min: 2.78677 max: 518.462 average: 126.926
 
Patch 65 named motorBike_fr-wh-brake-disk-shadow%83
 d  : min: 0.000285772 max: 0.0144996 average: 0.00413188
 y+ : min: 2.25531 max: 699.929 average: 135.181
 
Patch 66 named motorBike_rear-mud-guard-shadow%84
 d  : min: 0.000295653 max: 0.013536 average: 0.00399838
 y+ : min: 2.03781 max: 510.218 average: 104.402
 
Patch 67 named motorBike_rear-susp-spring-damp-shadow%85
 d  : min: 0.00327178 max: 0.0123216 average: 0.00651848
 y+ : min: 8.7858 max: 331.149 average: 80.401
 
Patch 68 named motorBike_radiator-shadow%86
 d  : min: 0.00376333 max: 0.0202953 average: 0.0111452
 y+ : min: 51.8406 max: 764.851 average: 436.34
 
Patch 69 named motorBike_rear-shock-link-shadow%87
 d  : min: 0.00462519 max: 0.0119373 average: 0.0082026
 y+ : min: 75.663 max: 242.782 average: 141.328
 
Patch 70 named motorBike_rear-brake-fluid-pot-bracket-shadow%88
 d  : min: 0.000350817 max: 0.0120304 average: 0.00447425
 y+ : min: 2.50756 max: 201.903 average: 69.0392
 
Patch 71 named motorBike_rr-wh-chain-hub-shadow%89
 d  : min: 0.000430666 max: 0.0102251 average: 0.00555544
 y+ : min: 6.13939 max: 479.068 average: 147.676
 
Writing yPlus to field yPlus
 
End

Hi:

I saw your results of yPlus, the value seems very big, and how can we judg the y+ is in the proper range?

dkokron · April 5, 2013, 12:48

@post 71.

I posting here as I have not found any other source for the yPlus utility from Daniel WEI.

I have attached a patch to allow yPlus.C to be compiled under OpenFOAM-2.2.x. Runs fine in my environment. Please check my work.

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