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May 1, 2017, 21:25
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twoPhaseEulerSedFoam scour case diverges
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#1 |
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New Member
Lee
Join Date: May 2015
Location: AU
Posts: 2
Rep Power: 0  |
Hello,
Please pardon my ignorance, I am new to OpenFOAM. Could you please point me in the right direction? I'm trying to model 2D scour beneath a pipeline, under a steady current condition, using twoPhaseEulerSedFoam (link below) on OpenFOAM-2.1.1. Although it was developed using OpenFOAM-2.1.0, the example cases ran fine on OpenFOAM-2.1.1. https://github.com/csdms-contrib/twophaseeulersedfoam I hope that the attached "alpha0.jpg" and "Ub0.jpg" can give you a good overview of the initial conditions. The problem is that there are very large time step continuity errors (as shown below) 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 : twoPhaseEulerSedFoam
Date : May 02 2017
Time : 09:59:46
Host : "jylee4-VirtualBox"
PID : 19239
Case : /home/jylee4/OpenFOAM/jylee4-2.1.1/run/case2h
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 = 0
Reading g
Reading transportProperties
Calculating face flux field phia
Calculating face flux field phib
Reading field alpha
Reading field p
kEpsilonCoeffs
{
Cmu 0.09;
C1 1.44;
C2 1.92;
alphak 1;
alphaEps 0.76923;
}
wallFunctionCoeffs
{
kappa 0.41;
E 9.8;
}
Reading field k
Reading field epsilon
Calculating field nutb
Calculating field nuEffa
Calculating field nuEffb
Calculating field DDtUa and DDtUb
Calculating field g.h
Selecting dragModel for phase a: GidaspowErgunWenYu
Selecting dragModel for phase b: GidaspowErgunWenYu
dragPhase is a
Selecting viscosityModel Gidaspow
Selecting conductivityModel Gidaspow
Selecting radialModel CarnahanStarling
Selecting granularPressureModel Lun
Selecting frictionalStressModel SrivastavaSundaresan
Courant Number mean: 0.00137713 max: 0.0190682
Reading transportProperties for gradP
Initializing with specified pressure gradient:(46.9899 0 0)
PIMPLE: max iterations = 50
field p : relTol 0, tolerance 0.0001
field U : relTol 0, tolerance 0.0001
field alpha : relTol 0, tolerance 0.0001
Starting time loop
Turbulence suspension term is included
Courant Number mean: 0.00137713 max: 0.0190682
Max Ur Courant Number = 0.0190682
Interface Courant Number mean: 0.00137713 max: 0.0190682
deltaT = 1.19904e-05 < 0.0005
Time = 1.19904e-05
PIMPLE: iteration 1
DILUPBiCG: Solving for alpha, Initial residual = 1.49347e-07, Final residual = 3.21951e-25, No Iterations 3
Dispersed phase volume fraction = 0.182364 Min(alpha) = 0 Max(alpha) = 0.6
DILUPBiCG: Solving for alpha, Initial residual = 5.486e-10, Final residual = 6.01472e-21, No Iterations 2
Dispersed phase volume fraction = 0.182364 Min(alpha) = 0 Max(alpha) = 0.6
DILUPBiCG: Solving for Theta, Initial residual = 1, Final residual = 7.43123e-11, No Iterations 8
kinTheory: max(Theta) = 0.000137375 min(Theta) = 0
kinTheory: min(nua) = 0, max(nua) = 2.27681e+32
kinTheory: min(pa) = 0, max(pa) = 5.37874
Max gradPs =119910,Min gradPs =0
Max gradPf =573016,Min gradPf =0
swak4Foam: Allocating new repository for sampledGlobalVariables
GAMG: Solving for p, Initial residual = 1, Final residual = 6.44256e-10, No Iterations 161
GAMG: Solving for p, Initial residual = 0.0567147, Final residual = 5.77517e-10, No Iterations 73
time step continuity errors : sum local = 4.97447e-13, global = 3.86504e-14, cumulative = 3.86504e-14
DILUPBiCG: Solving for alpha, Initial residual = 1.64902e-06, Final residual = 8.65104e-25, No Iterations 4
Dispersed phase volume fraction = 0.182364 Min(alpha) = 0 Max(alpha) = 0.6
DILUPBiCG: Solving for alpha, Initial residual = 1.25664e-08, Final residual = 6.23708e-24, No Iterations 3
Dispersed phase volume fraction = 0.182364 Min(alpha) = 0 Max(alpha) = 0.6
GAMG: Solving for p, Initial residual = 0.0058589, Final residual = 8.81012e-10, No Iterations 119
GAMG: Solving for p, Initial residual = 0.794251, Final residual = 9.101e-10, No Iterations 89
time step continuity errors : sum local = 5.50086e-14, global = 1.83734e-15, cumulative = 4.04877e-14
DILUPBiCG: Solving for alpha, Initial residual = 1.61092e-06, Final residual = 7.69513e-22, No Iterations 13
Dispersed phase volume fraction = 0.182364 Min(alpha) = 0 Max(alpha) = 0.6
DILUPBiCG: Solving for alpha, Initial residual = 1.59849e-08, Final residual = 3.91697e-22, No Iterations 8
Dispersed phase volume fraction = 0.182364 Min(alpha) = 0 Max(alpha) = 0.6
PIMPLE: iteration 2
DILUPBiCG: Solving for alpha, Initial residual = 8.06833e-10, Final residual = 2.4574e-21, No Iterations 10
Dispersed phase volume fraction = 0.182364 Min(alpha) = 0 Max(alpha) = 0.6
DILUPBiCG: Solving for alpha, Initial residual = 4.38846e-10, Final residual = 4.53047e-22, No Iterations 10
Dispersed phase volume fraction = 0.182364 Min(alpha) = 0 Max(alpha) = 0.6
DILUPBiCG: Solving for Theta, Initial residual = 6.31348e-17, Final residual = 6.31348e-17, No Iterations 0
kinTheory: max(Theta) = 0.000137375 min(Theta) = 0
kinTheory: min(nua) = 0, max(nua) = 1.81897e+32
kinTheory: min(pa) = 0, max(pa) = 5.37874
Max gradPs =113411,Min gradPs =0
Max gradPf =541822,Min gradPf =0
GAMG: Solving for p, Initial residual = 1, Final residual = 6.25606e-10, No Iterations 70
GAMG: Solving for p, Initial residual = 0.000466378, Final residual = 8.81131e-10, No Iterations 52
time step continuity errors : sum local = 5.33473e+07, global = 1.91681e+06, cumulative = 1.91681e+06
DILUPBiCG: Solving for alpha, Initial residual = 3.45233e-08, Final residual = 3.45233e-08, No Iterations 1001
Dispersed phase volume fraction = 0.182515 Min(alpha) = 0 Max(alpha) = 0.6
DILUPBiCG: Solving for alpha, Initial residual = 3.45166e-08, Final residual = 1.00473e-07, No Iterations 1001
Dispersed phase volume fraction = 0.374457 Min(alpha) = 0 Max(alpha) = 0.634
GAMG: Solving for p, Initial residual = 0.999775, Final residual = 7.53284e-10, No Iterations 101
GAMG: Solving for p, Initial residual = 0.000436472, Final residual = 8.85226e-10, No Iterations 47
time step continuity errors : sum local = 2.54219e+11, global = -2.31365e+10, cumulative = -2.31345e+10
#0 Foam::error::printStack(Foam::Ostream&) in "/home/jylee4/OpenFOAM/OpenFOAM-2.1.1/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#1 Foam::sigFpe::sigHandler(int) in "/home/jylee4/OpenFOAM/OpenFOAM-2.1.1/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#2 in "/lib/x86_64-linux-gnu/libc.so.6"
#3 Foam::DILUPreconditioner::calcReciprocalD(Foam::Field<double>&, Foam::lduMatrix const&) in "/home/jylee4/OpenFOAM/OpenFOAM-2.1.1/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#4 Foam::DILUPreconditioner::DILUPreconditioner(Foam::lduMatrix::solver const&, Foam::dictionary const&) in "/home/jylee4/OpenFOAM/OpenFOAM-2.1.1/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#5 Foam::lduMatrix::preconditioner::addasymMatrixConstructorToTable<Foam::DILUPreconditioner>::New(Foam::lduMatrix::solver const&, Foam::dictionary const&) in "/home/jylee4/OpenFOAM/OpenFOAM-2.1.1/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#6 Foam::lduMatrix::preconditioner::New(Foam::lduMatrix::solver const&, Foam::dictionary const&) in "/home/jylee4/OpenFOAM/OpenFOAM-2.1.1/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#7 Foam::PBiCG::solve(Foam::Field<double>&, Foam::Field<double> const&, unsigned char) const in "/home/jylee4/OpenFOAM/OpenFOAM-2.1.1/platforms/linux64GccDPOpt/lib/libOpenFOAM.so"
#8 Foam::fvMatrix<double>::solve(Foam::dictionary const&) in "/home/jylee4/OpenFOAM/OpenFOAM-2.1.1/platforms/linux64GccDPOpt/lib/libfiniteVolume.so"
#9 Foam::fvMatrix<double>::solve() in "/home/jylee4/OpenFOAM/jylee4-2.1.1/platforms/linux64GccDPOpt/bin/twoPhaseEulerSedFoam"
#10
in "/home/jylee4/OpenFOAM/jylee4-2.1.1/platforms/linux64GccDPOpt/bin/twoPhaseEulerSedFoam"
#11 __libc_start_main in "/lib/x86_64-linux-gnu/libc.so.6"
#12
in "/home/jylee4/OpenFOAM/jylee4-2.1.1/platforms/linux64GccDPOpt/bin/twoPhaseEulerSedFoam"
Floating point exception (core dumped)
1. Copied the "Sumer1996" steady flow example case for twoPhaseEulerSedFoam, and replaced the mesh via fluent3DMeshToFoam (checkMesh.log provided below) checkMesh.log: 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 : checkMesh
Date : May 02 2017
Time : 09:14:18
Host : "jylee4-VirtualBox"
PID : 18757
Case : /home/jylee4/OpenFOAM/jylee4-2.1.1/run/case2h
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 polyMesh for time = 0
Time = 0
Mesh stats
points: 224000
internal points: 0
faces: 445612
internal faces: 221612
cells: 111204
boundary patches: 8
point zones: 0
face zones: 1
cell zones: 1
Overall number of cells of each type:
hexahedra: 111204
prisms: 0
wedges: 0
pyramids: 0
tet wedges: 0
tetrahedra: 0
polyhedra: 0
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
bed 448 898 ok (non-closed singly connected)
fluidin 149 300 ok (non-closed singly connected)
fluidout 149 300 ok (non-closed singly connected)
pipe 200 400 ok (non-closed singly connected)
sedin 99 200 ok (non-closed singly connected)
sedout 99 200 ok (non-closed singly connected)
symsides 222408 224000 ok (non-closed singly connected)
top 448 898 ok (non-closed singly connected)
Checking geometry...
Overall domain bounding box (-1 0 0) (1 0.33 0.005)
Mesh (non-empty, non-wedge) directions (1 1 0)
Mesh (non-empty) directions (1 1 0)
All edges aligned with or perpendicular to non-empty directions.
Boundary openness (3.79223e-21 8.50472e-18 1.63851e-15) OK.
Max cell openness = 2.89168e-16 OK.
Max aspect ratio = 20.0908 OK.
Minumum face area = 5.62712e-07. Maximum face area = 8.99651e-05. Face area magnitudes OK.
Min volume = 2.81356e-09. Max volume = 3.6539e-07. Total volume = 0.00329018. Cell volumes OK.
Mesh non-orthogonality Max: 44.0733 average: 10.1293
Non-orthogonality check OK.
Face pyramids OK.
Max skewness = 0.456248 OK.
Coupled point location match (average 0) OK.
Mesh OK.
End
0/Ub: 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 volVectorField;
object Ub; //fluid velocity
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [ 0 1 -1 0 0 0 0 ];
internalField uniform (0 0 0);
boundaryField
{
bed
{
type fixedValue;
value uniform (0 0 0);
}
fluidin
{
type groovyBC;
variables
(
"uf=0.043914724;" // friction velocity, m/s
"z0=3e-05;" // bed roughness length, m
"kappaa=0.40;" // von Karman's constant (Soulsby, 1997)
//"height=pos().y-0.1+z0;" // elevation - sediment box height; CAN'T BE 0
"height=sqrt(sqr(pos().y-0.1+z0));" // elevation - sediment box height; CAN'T BE 0
"velx=(uf/kappaa)*log(height/z0)*normal();"
);
valueExpression "-velx";
value uniform (0 0 0);
}
fluidout
{
//type zeroGradient;
type inletOutlet;
inletValue uniform (0 0 0); //no backflow
value uniform ( 0 0 0 ); //zero gradient for outflow
}
pipe
{
type fixedValue;
value uniform (0 0 0);
}
sedin
{
type zeroGradient;
//type fixedValue;
//value uniform (0 0 0);
}
sedout
{
//type zeroGradient;
type inletOutlet;
inletValue uniform (0 0 0); //no backflow
value uniform ( 0 0 0 ); //zero gradient for outflow
}
symsides
{
type empty;
}
top
{
type symmetryPlane;
//type slip;
//type pressureInletOutletVelocity;
//value uniform (0.982 0 0);
}
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
system/setFieldsDict: 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 "system";
object setFieldsDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
defaultFieldValues /* outside sediment box */
(
volScalarFieldValue alpha 0
);
regions
(
boxToCell
{
box ( -1 0 0 ) ( 1 0.1 0.005 ) ; // inside sediment box
fieldValues
(
volScalarFieldValue alpha 0.6 //6.107060e-01
);
}
);
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;
//root "~/OpenFOAM/jylee4-2.1.1/run";
//case "case2h";
//instance "system";
//local "";
class dictionary;
location "system";
object funkySetFieldsDict;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
expressions
(
initialVelProfile
{
field Ub; // field to initialise
condition "pos().y>0.1 && pos().y<0.33";
keepPatches true; //keep the boundary conditions that were set before
//expression "vector(1,0,0)*(0.043914724/0.4)*log((pos().y)/3e-05)";
expression "vector(1,0,0)*(0.043914724/0.4)*log((sqrt(sqr(pos().y-0.1+3e-05)))/3e-05)";
dimension [0 1 -1 0 0];
}
);
// ************************************************************************* //
Code:
setFields funkySetFields -time 0 twoPhaseEulerSedFoam 6. back to twoPhaseEulerSedFoam, I reduced the nOuterCorrectors in the PIMPLE loop to 1 (in fvSolution), and reduced the writeInterval to a value which is equal to deltaT (in controlDict), to visualise the output. With reference to the attached "p1.jpg" and "Ub1.jpg" files, it seems that there are very large pressure and velocity values at the outlet, or more specifically, at the interface between the fluid and sediment phase. However, I have no idea how to fix this. I've tried using zeroGradient and fixedValue for the outlet boundary for p, zeroGradient and inletOutlet for the outlet for Ua and Ub, but that didn't work. Please find the files here: https://www.dropbox.com/s/ka99wfmfnx...2h.tar.gz?dl=0 Many thanks for your patience and kind assistance. |
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October 16, 2017, 06:25
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#2 |
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New Member
Join Date: Nov 2016
Posts: 4
Rep Power: 9 |
hey,I'm doing some research on scour recently,do you solve your problem?
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November 10, 2017, 10:50
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#3 | |
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New Member
Tina Ebrahimi
Join Date: Oct 2017
Posts: 4
Rep Power: 8 |
Quote:
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November 12, 2017, 12:32
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#4 |
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Member
Declan
Join Date: Oct 2016
Location: Ireland
Posts: 40
Rep Power: 9 |
Try checking out scourFoam
Erosion/sediment transport with OpenFOAM: Which model to use? Or a Larangian solver depending on the scale of your problem |
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| Tags |
| twophaseeulersedfoam |
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