| Dorian1504 |
January 17, 2018 04:18 |
Time Step Continuity Errors simpleFoam
5 Attachment(s)
Hello,
I'm trying to simulate a flow around a 3D-wing. I want to use k-omegaSST (or k-epsilon) turbulence model. I'm decreasing the size of the layers step by step, however when my y+ is near 45 the time step continuity error starts diverging and the simulation stops.
I've tried to change my schemes, my BC or relaxation coefficients without success.
I don't understand where this error come from knowing that the simulation run for a y+~100. Another simulation using the spalartAllmaras model also converges (with the same mesh and BC). Moreover my checkMesh is ok.
Code:
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time
Create mesh for time = 0
SIMPLE: convergence criteria
field U tolerance 0.0001
field p tolerance 0.001
field "(k|epsilon|omega)" tolerance 0.001
Reading field p
Reading field U
Reading/calculating face flux field phi
Selecting incompressible transport model Newtonian
Selecting turbulence model type RAS
Selecting RAS turbulence model kOmegaSST
Selecting patchDistMethod meshWave
kOmegaSSTCoeffs
{
alphaK1 0.85;
alphaK2 1;
alphaOmega1 0.5;
alphaOmega2 0.856;
gamma1 0.555556;
gamma2 0.44;
beta1 0.075;
beta2 0.0828;
betaStar 0.09;
a1 0.31;
b1 1;
c1 10;
F3 false;
}
No MRF models present
No finite volume options present
Starting time loop
forces forces:
Not including porosity effects
forceCoeffs forces:
Not including porosity effects
Time = 1
smoothSolver: Solving for Ux, Initial residual = 0.99999, Final residual = 0.0764658, No Iterations 2
smoothSolver: Solving for Uy, Initial residual = 1, Final residual = 0.0386756, No Iterations 3
smoothSolver: Solving for Uz, Initial residual = 0.999997, Final residual = 0.0791299, No Iterations 2
GAMG: Solving for p, Initial residual = 1, Final residual = 0.0690019, No Iterations 7
time step continuity errors : sum local = 0.028254, global = -0.00313196, cumulative = -0.00313196
smoothSolver: Solving for omega, Initial residual = 0.00535907, Final residual = 0.000196025, No Iterations 1
bounding omega, min: -25706.4 max: 3.8584e+06 average: 95308.2
smoothSolver: Solving for k, Initial residual = 1, Final residual = 0.00489828, No Iterations 1
ExecutionTime = 100.23 s ClockTime = 100 s
forceCoeffs forces write:
Cm = -5.01564
Cd = 44.5862
Cl = 6.34427
Cl(f) = -1.84351
Cl(r) = 8.18777
Time = 2
smoothSolver: Solving for Ux, Initial residual = 0.0503861, Final residual = 0.00457665, No Iterations 2
smoothSolver: Solving for Uy, Initial residual = 0.056634, Final residual = 0.00502492, No Iterations 2
smoothSolver: Solving for Uz, Initial residual = 0.202114, Final residual = 0.0186672, No Iterations 2
GAMG: Solving for p, Initial residual = 0.490306, Final residual = 0.027328, No Iterations 2
time step continuity errors : sum local = 12.3113, global = -0.00624942, cumulative = -0.00938138
smoothSolver: Solving for omega, Initial residual = 0.00135869, Final residual = 1.21457e-05, No Iterations 1
smoothSolver: Solving for k, Initial residual = 0.383071, Final residual = 0.00314367, No Iterations 1
ExecutionTime = 131.72 s ClockTime = 132 s
forceCoeffs forces write:
Cm = -2.32634
Cd = 20.2918
Cl = 2.99807
Cl(f) = -0.827308
Cl(r) = 3.82538
Time = 3
smoothSolver: Solving for Ux, Initial residual = 0.0923705, Final residual = 0.00468338, No Iterations 4
smoothSolver: Solving for Uy, Initial residual = 0.103414, Final residual = 0.00676207, No Iterations 4
smoothSolver: Solving for Uz, Initial residual = 0.203299, Final residual = 0.0108881, No Iterations 4
GAMG: Solving for p, Initial residual = 0.587766, Final residual = 0.0540848, No Iterations 4
time step continuity errors : sum local = 29.5512, global = 0.154192, cumulative = 0.144811
smoothSolver: Solving for omega, Initial residual = 0.0731651, Final residual = 0.00077162, No Iterations 1
smoothSolver: Solving for k, Initial residual = 0.0828431, Final residual = 0.000851564, No Iterations 1
ExecutionTime = 169.14 s ClockTime = 169 s
forceCoeffs forces write:
Cm = 177.768
Cd = -1327
Cl = -292.705
Cl(f) = 31.4153
Cl(r) = -324.121
Time = 4
smoothSolver: Solving for Ux, Initial residual = 0.651467, Final residual = 0.0353532, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 0.684837, Final residual = 0.0367144, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 0.684076, Final residual = 0.0372442, No Iterations 1
GAMG: Solving for p, Initial residual = 0.00919992, Final residual = 0.000641066, No Iterations 7
time step continuity errors : sum local = 16.0459, global = -2.34303, cumulative = -2.19822
smoothSolver: Solving for omega, Initial residual = 0.076197, Final residual = 0.0013213, No Iterations 1
smoothSolver: Solving for k, Initial residual = 0.0370577, Final residual = 0.000367212, No Iterations 1
ExecutionTime = 206.58 s ClockTime = 207 s
forceCoeffs forces write:
Cm = -374.837
Cd = 5347.9
Cl = 670.105
Cl(f) = -39.7839
Cl(r) = 709.889
Time = 5
smoothSolver: Solving for Ux, Initial residual = 0.599135, Final residual = 0.0538314, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 0.641251, Final residual = 0.05281, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 0.591677, Final residual = 0.0467585, No Iterations 1
GAMG: Solving for p, Initial residual = 0.0677127, Final residual = 0.00567401, No Iterations 13
time step continuity errors : sum local = 41.1121, global = -4.97447, cumulative = -7.17269
smoothSolver: Solving for omega, Initial residual = 0.0675145, Final residual = 0.00111715, No Iterations 1
smoothSolver: Solving for k, Initial residual = 0.0337135, Final residual = 0.000382671, No Iterations 1
ExecutionTime = 253.04 s ClockTime = 253 s
forceCoeffs forces write:
Cm = -8352.88
Cd = -17220.7
Cl = 11998.4
Cl(f) = -2353.7
Cl(r) = 14352.1
Time = 6
smoothSolver: Solving for Ux, Initial residual = 0.689606, Final residual = 0.0548645, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 0.702136, Final residual = 0.064385, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 0.691323, Final residual = 0.0648999, No Iterations 1
GAMG: Solving for p, Initial residual = 0.0115375, Final residual = 0.00112664, No Iterations 165
time step continuity errors : sum local = 1635.2, global = 193.916, cumulative = 186.743
smoothSolver: Solving for omega, Initial residual = 0.124886, Final residual = 0.00154642, No Iterations 1
smoothSolver: Solving for k, Initial residual = 0.0480225, Final residual = 0.000597913, No Iterations 1
ExecutionTime = 528.78 s ClockTime = 529 s
forceCoeffs forces write:
Cm = 5.34103e+06
Cd = -2.49835e+06
Cl = -1.2117e+07
Cl(f) = -717471
Cl(r) = -1.13995e+07
Time = 7
smoothSolver: Solving for Ux, Initial residual = 0.677576, Final residual = 0.025612, No Iterations 1
smoothSolver: Solving for Uy, Initial residual = 0.691005, Final residual = 0.0299412, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 0.662216, Final residual = 0.0543164, No Iterations 1
GAMG: Solving for p, Initial residual = 0.00381449, Final residual = 0.00746159, No Iterations 1000
time step continuity errors : sum local = 674286, global = -550585, cumulative = -550398
smoothSolver: Solving for omega, Initial residual = 0.0188267, Final residual = 0.000330376, No Iterations 1
smoothSolver: Solving for k, Initial residual = 0.0507805, Final residual = 0.000431565, No Iterations 1
ExecutionTime = 2062.05 s ClockTime = 2064 s
forceCoeffs forces write:
Cm = -2.28456e+10
Cd = 7.07455e+10
Cl = 7.99311e+10
Cl(f) = 1.712e+10
Cl(r) = 6.28112e+10
Time = 8
smoothSolver: Solving for Ux, Initial residual = 0.666421, Final residual = 0.0453112, No Iterations 6
smoothSolver: Solving for Uy, Initial residual = 0.695728, Final residual = 0.0554333, No Iterations 3
smoothSolver: Solving for Uz, Initial residual = 0.653737, Final residual = 0.0285133, No Iterations 5
GAMG: Solving for p, Initial residual = 0.424611, Final residual = 0.0419241, No Iterations 236
time step continuity errors : sum local = 3.19872e+07, global = 2.92964e+07, cumulative = 2.8746e+07
smoothSolver: Solving for omega, Initial residual = 0.122421, Final residual = 0.00140935, No Iterations 1
smoothSolver: Solving for k, Initial residual = 0.0480735, Final residual = 0.000354375, No Iterations 1
ExecutionTime = 2449.07 s ClockTime = 2452 s
forceCoeffs forces write:
Cm = 2.90902e+15
Cd = 5.00479e+15
Cl = -4.29443e+15
Cl(f) = 7.61808e+14
Cl(r) = -5.05624e+15
Time = 9
smoothSolver: Solving for Ux, Initial residual = 0.682372, Final residual = 0.0414407, No Iterations 3
smoothSolver: Solving for Uy, Initial residual = 0.685099, Final residual = 0.0431815, No Iterations 2
smoothSolver: Solving for Uz, Initial residual = 0.686867, Final residual = 0.0604966, No Iterations 2
GAMG: Solving for p, Initial residual = 0.574339, Final residual = 2.82489, No Iterations 1000
time step continuity errors : sum local = 3.73545e+13, global = -3.6676e+13, cumulative = -3.6676e+13
smoothSolver: Solving for omega, Initial residual = 0.00145352, Final residual = 1.949e-05, No Iterations 1
smoothSolver: Solving for k, Initial residual = 0.0410455, Final residual = 0.000270812, No Iterations 1
ExecutionTime = 3986.59 s ClockTime = 3991 s
forceCoeffs forces write:
Cm = 1.44699e+21
Cd = 2.31148e+21
Cl = -2.2355e+21
Cl(f) = 3.2924e+20
Cl(r) = -2.56474e+21
Time = 10
smoothSolver: Solving for Ux, Initial residual = 0.56782, Final residual = 0.0167332, No Iterations 2
smoothSolver: Solving for Uy, Initial residual = 0.61319, Final residual = 0.0588445, No Iterations 1
smoothSolver: Solving for Uz, Initial residual = 0.549356, Final residual = 0.0526533, No Iterations 1
GAMG: Solving for p, Initial residual = 0.97733, Final residual = 0.0958427, No Iterations 13
time step continuity errors : sum local = 3.74547e+12, global = -2.75918e+11, cumulative = -3.69519e+13
smoothSolver: Solving for omega, Initial residual = 0.00314259, Final residual = 5.58918e-05, No Iterations 1
smoothSolver: Solving for k, Initial residual = 0.0131684, Final residual = 0.000191094, No Iterations 1
ExecutionTime = 4033.9 s ClockTime = 4038 s
forceCoeffs forces write:
Cm = 4.98589e+26
Cd = 8.00075e+26
Cl = -7.70819e+26
Cl(f) = 1.1318e+26
Cl(r) = -8.83999e+26
checkMesh
Code:
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 4.1 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 4.1
Exec : checkMesh
Date : Jan 17 2018
Time : 18:05:41
Host : "node1"
PID : 23705
Case : /home/dorian/OpenFOAM/dorian-4.1/run/opti_CFD
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time
Create polyMesh for time = 0
Time = 0
Mesh stats
points: 6372893
faces: 16961350
internal faces: 16506757
cells: 5339871
faces per cell: 6.26759
boundary patches: 4
point zones: 0
face zones: 0
cell zones: 0
Overall number of cells of each type:
hexahedra: 4201176
prisms: 52186
wedges: 0
pyramids: 0
tet wedges: 2
tetrahedra: 0
polyhedra: 1086507
Breakdown of polyhedra by number of faces:
faces number of cells
4 91219
5 51893
6 79622
7 495583
8 198702
9 94900
10 1585
11 306
12 41478
15 31217
18 2
Checking topology...
Boundary definition OK.
Cell to face addressing OK.
Point usage OK.
Upper triangular ordering OK.
Face vertices OK.
Number of regions: 1 (OK).
Checking patch topology for multiply connected surfaces...
Patch Faces Points Surface topology
box 7200 7296 ok (non-closed singly connected)
inlet 560 609 ok (non-closed singly connected)
outlet 560 609 ok (non-closed singly connected)
wing 446273 537464 ok (closed singly connected)
Checking geometry...
Overall domain bounding box (-5 -2.60002 -2) (10 3.00002 2)
Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
Mesh has 3 solution (non-empty) directions (1 1 1)
Boundary openness (4.16873e-16 -7.5958e-16 7.66195e-15) OK.
Max cell openness = 1.18722e-15 OK.
Max aspect ratio = 26.1576 OK.
Minimum face area = 5.11162e-08. Maximum face area = 0.040077. Face area magnitudes OK.
Min volume = 3.57011e-11. Max volume = 0.00801562. Total volume = 335.914. Cell volumes OK.
Mesh non-orthogonality Max: 64.8844 average: 9.43194
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 3.01112 OK.
Coupled point location match (average 0) OK.
Mesh OK.
End
k
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 4.1 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object k;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
kInlet 38.11; // approx k = 1.5*(I*U)^2 ; I = 0.1
dimensions [0 2 -2 0 0 0 0];
internalField uniform $kInlet;
boundaryField
{
inlet
{
type fixedValue;
value uniform $kInlet;
}
outlet
{
type inletOutlet;
inletValue uniform $kInlet;
value uniform $kInlet;
}
wing
{
type kqRWallFunction;
value uniform $kInlet;
}
box
{
type zeroGradient;
}
}
// ************************************************************************* //
Does anyone have an hint or solution about this issue?
Thank you ! |
