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December 13, 2018, 08:47
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Water pump setup OF4.1
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#1 |
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New Member
Christian Wolf
Join Date: Mar 2009
Posts: 27
Rep Power: 17  |
Hello!
(0) I am running into problems, simulating a water pump in simpleFoam and MRF approach. My goals is: After finishing the steady-state run, to continue transient run with pimpleDyMFoam with rigid body motion of rotor. At the moment, I do not get a reasonable result with simpleFoam. (1) My approach: (1a) The rotor is meshed with ICEM/Hexa. A periodic segment is copy and pasted in order to get a 360deg rotor mesh. Even meshing with Hexa, the mesh quality is not very good, as the blades have strong curvature. (1b) The volute and outlet piping is meshed with StarCCM+ Trimmed cells. (1c) The water inlet piping consists out of 2 pipings. Both are meshed in ICEM/Hexa. The interface between both piping is vertex conformal. (1d) I use cyclicAMI interface for connection at inlet piping/rotor and rotor/volute. (2) Settings: (2a) To connect the vertex conformal meshes of (1c), I used Code:
stitchMesh -perfect Interface-14 Interface-15 (2b) cellZone_1 represents rotor mesh. (3) CheckMesh shows: Code:
checkMesh -time 1 -allTopology
Create time
Create polyMesh for time = 1
Enabling all (cell, face, edge, point) topology checks.
Time = 1
Mesh stats
points: 4304866
faces: 12601483
internal faces: 12269440
cells: 4143883
faces per cell: 6.00184
boundary patches: 17
point zones: 0
face zones: 1
cell zones: 4
Overall number of cells of each type:
hexahedra: 3960110
prisms: 97026
wedges: 7534
pyramids: 152
tet wedges: 21
tetrahedra: 11036
polyhedra: 68004
Breakdown of polyhedra by number of faces:
faces number of cells
4 7
5 166
6 8899
7 36734
8 4987
9 9555
10 624
11 129
12 4431
13 119
14 26
15 2314
16 13
Checking topology...
Boundary definition OK.
Cell to face addressing OK.
Point usage OK.
<<Found 18 neighbouring cells with multiple inbetween faces.
Upper triangular ordering OK.
<<Writing 36 unordered faces to set upperTriangularFace
Face vertices OK.
Topological cell zip-up check OK.
<<Number of duplicate (not baffle) faces found: 9. This might indicate a problem.
<<Number of faces with non-consecutive shared points: 27. This might indicate a problem.
<<Writing 54 faces with non-standard edge connectivity to set edgeFaces
*Number of regions: 3
The mesh has multiple regions which are not connected by any face.
<<Writing region information to "1/cellToRegion"
<<Writing region 0 (fully disconnected) with 3290580 cells to cellSet region0
<<Writing region 1 (fully disconnected) with 108360 cells to cellSet region1
<<Writing region 2 (fully disconnected) with 744943 cells to cellSet region2
Checking patch topology for multiply connected surfaces...
Patch Faces Points Surface topology
IF-ROTOR-STATOR 25560 25920 ok (non-closed singly connected)
HUB 35100 36061 ok (non-closed singly connected)
BLADE-FRONT 7110 7824 ok (non-closed singly connected)
BLADE 54870 56160 ok (non-closed singly connected)
SHROUD 51660 52020 ok (non-closed singly connected)
IF-BC-IN 29880 30061 ok (non-closed singly connected)
TIP 6300 6816 ok (non-closed singly connected)
Interface-14 0 0 ok (empty)
EXTRUSION-inlet-layer 60 120 ok (non-closed singly connected)
FLUID-INLET-LAYER 765 796 ok (non-closed singly connected)
Interface-15 0 0 ok (empty)
TRM_SRF 5580 5640 ok (non-closed singly connected)
EXTRUSION 2340 2400 ok (non-closed singly connected)
IF-U-PUMP 1185 1216 ok (non-closed singly connected)
Wall 97902 89775 ok (non-closed singly connected)
Volute_Mixing_Interface 12410 13142 ok (non-closed singly connected)
Outlet 1321 1401 ok (non-closed singly connected)
Checking geometry...
Overall domain bounding box (-0.667384 -0.526093 -2.77437) (0.622538 0.540912 -2.17567)
Mesh has 3 geometric (non-empty/wedge) directions (1 1 1)
Mesh has 3 solution (non-empty) directions (1 1 1)
Boundary openness (-7.86524e-17 -9.76514e-17 5.06224e-17) OK.
Max cell openness = 8.43072e-16 OK.
Max aspect ratio = 21.7438 OK.
Minimum face area = 1.5237e-09. Maximum face area = 0.000165698. Face area magnitudes OK.
Min volume = 3.0602e-13. Max volume = 1.33109e-06. Total volume = 0.0405201. Cell volumes OK.
Mesh non-orthogonality Max: 84.4003 average: 37.6213
*Number of severely non-orthogonal (> 70 degrees) faces: 462293.
Non-orthogonality check OK.
<<Writing 462293 non-orthogonal faces to set nonOrthoFaces
Face pyramids OK.
Max skewness = 3.74722 OK.
Coupled point location match (average 0) OK.
Mesh OK.
End
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 polyBoundaryMesh;
location "1/polyMesh";
object boundary;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
17
(
IF-ROTOR-STATOR
{
type cyclicAMI;
inGroups 1(cyclicAMI);
nFaces 25560;
startFace 12269440;
matchTolerance 0.001;
transform noOrdering;
neighbourPatch Volute_Mixing_Interface;
}
HUB
{
type wall;
inGroups 1(wall);
nFaces 35100;
startFace 12295000;
}
BLADE-FRONT
{
type wall;
inGroups 1(wall);
nFaces 7110;
startFace 12330100;
}
BLADE
{
type wall;
inGroups 1(wall);
nFaces 54870;
startFace 12337210;
}
SHROUD
{
type wall;
inGroups 1(wall);
nFaces 51660;
startFace 12392080;
}
IF-BC-IN
{
type cyclicAMI;
inGroups 1(cyclicAMI);
nFaces 29880;
startFace 12443740;
matchTolerance 0.001;
transform noOrdering;
neighbourPatch IF-U-PUMP;
}
TIP
{
type wall;
inGroups 1(wall);
nFaces 6300;
startFace 12473620;
}
Interface-14
{
type wall;
inGroups 1(wall);
nFaces 0;
startFace 12479920;
}
EXTRUSION-inlet-layer
{
type wall;
inGroups 1(wall);
nFaces 60;
startFace 12479920;
}
FLUID-INLET-LAYER
{
type patch;
nFaces 765;
startFace 12479980;
}
Interface-15
{
type wall;
inGroups 1(wall);
nFaces 0;
startFace 12480745;
}
TRM_SRF
{
type wall;
inGroups 1(wall);
nFaces 5580;
startFace 12480745;
}
EXTRUSION
{
type wall;
inGroups 1(wall);
nFaces 2340;
startFace 12486325;
}
IF-U-PUMP
{
type cyclicAMI;
inGroups 1(cyclicAMI);
nFaces 1185;
startFace 12488665;
matchTolerance 0.001;
transform noOrdering;
neighbourPatch IF-BC-IN;
}
Wall
{
type wall;
inGroups 1(wall);
nFaces 97902;
startFace 12489850;
}
Volute_Mixing_Interface
{
type cyclicAMI;
inGroups 1(cyclicAMI);
nFaces 12410;
startFace 12587752;
matchTolerance 0.001;
transform noOrdering;
neighbourPatch IF-ROTOR-STATOR;
}
Outlet
{
type patch;
nFaces 1321;
startFace 12600162;
}
)
(5) My choice of boundary conditions: (5a) ./1/U Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.0.x |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volVectorField;
location "0";
object U;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 1 -1 0 0 0 0];
internalField uniform (0 0.1 0);
boundaryField
{
IF-ROTOR-STATOR
{
type cyclicAMI;
}
Interface-14
{
type zeroGradient;
}
IF-BC-IN
{
type cyclicAMI;
}
Interface-15
{
type zeroGradient;
}
EXTRUSION-inlet-layer
{
type fixedValue;
value uniform (0 0 0);
}
HUB
{
type fixedValue;
value uniform (0 0 0);
}
BLADE-FRONT
{
type fixedValue;
value uniform (0 0 0);
}
BLADE
{
type fixedValue;
value uniform (0 0 0);
}
TIP
{
type fixedValue;
value uniform (0 0 0);
}
FLUID-INLET-LAYER
{
type fixedValue;
value uniform (0 0.7878 0);
// type flowRateInletVelocity;
// flowRate 0.0138;
// value uniform (0 0.7878 0);
}
SHROUD
{
type fixedValue;
value uniform (0 0 0);
}
TRM_SRF
{
type fixedValue;
value uniform (0 0 0);
}
EXTRUSION
{
type fixedValue;
value uniform (0 0 0);
}
Wall
{
type fixedValue;
value uniform (0 0 0);
}
IF-U-PUMP
{
type cyclicAMI;
}
Outlet
{
type zeroGradient;
// type pressureInletOutletVelocity;
// value $internalField;
}
Volute_Mixing_Interface
{
type cyclicAMI;
}
}
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.0.0 |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
object p;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 2 -2 0 0 0 0];
internalField uniform 700;
boundaryField
{
FLUID-INLET-LAYER
{
// type fixedValue;
// value uniform 0;
type zeroGradient;
}
IF-ROTOR-STATOR
{
type cyclicAMI;
}
Interface-14
{
type zeroGradient;
}
IF-BC-IN
{
type cyclicAMI;
}
Interface-15
{
type zeroGradient;
}
EXTRUSION-inlet-layer
{
type zeroGradient;
}
HUB
{
type zeroGradient;
}
BLADE-FRONT
{
type zeroGradient;
}
BLADE
{
type zeroGradient;
}
TIP
{
type zeroGradient;
}
SHROUD
{
type zeroGradient;
}
TRM_SRF
{
type zeroGradient;
}
EXTRUSION
{
type zeroGradient;
}
Wall
{
type zeroGradient;
}
IF-U-PUMP
{
type cyclicAMI;
}
Outlet
{
// type zeroGradient;
type fixedValue;
value $internalField;
}
Volute_Mixing_Interface
{
type cyclicAMI;
}
}
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.0.0 |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
location "0";
object k;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 2 -2 0 0 0 0];
internalField uniform 1;
boundaryField
{
FLUID-INLET-LAYER
{
// type fixedValue;
// value uniform 3.103e-03;
type turbulentIntensityKineticEnergyInlet;
intensity 0.05;
value $internalField;
}
IF-ROTOR-STATOR
{
type cyclicAMI;
value $internalField;
}
Interface-14
{
type kqRWallFunction;
value $internalField;
}
IF-BC-IN
{
type cyclicAMI;
value $internalField;
}
Interface-15
{
type kqRWallFunction;
value uniform 1;
}
EXTRUSION-inlet-layer
{
type kqRWallFunction;
value $internalField;
}
HUB
{
type kqRWallFunction;
value $internalField;
}
BLADE-FRONT
{
type kqRWallFunction;
value $internalField;
}
BLADE
{
type kqRWallFunction;
value $internalField;
}
TIP
{
type kqRWallFunction;
value $internalField;
}
SHROUD
{
type kqRWallFunction;
value $internalField;
}
TRM_SRF
{
type kqRWallFunction;
value $internalField;
}
EXTRUSION
{
type kqRWallFunction;
value $internalField;
}
Wall
{
type kqRWallFunction;
value $internalField;
}
IF-U-PUMP
{
type cyclicAMI;
value $internalField;
}
Outlet
{
type zeroGradient;
// value uniform 1;
// type inletOutlet;
// inletValue $internalField;
// value $internalField;
}
Volute_Mixing_Interface
{
type cyclicAMI;
value $internalField;
}
}
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December 13, 2018, 09:02
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#2 |
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New Member
Christian Wolf
Join Date: Mar 2009
Posts: 27
Rep Power: 17 |
CONTINUED......
(5d) ./1/epsilon Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.0.0 |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
location "0";
object epsilon;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 2 -3 0 0 0 0];
internalField uniform 10;
boundaryField
{
FLUID-INLET-LAYER
{
// type fixedValue;
// value uniform 3.79e-03;
type turbulentMixingLengthDissipationRateInlet;
mixingLength 0.005;
value $internalField;
}
IF-ROTOR-STATOR
{
type cyclicAMI;
// value uniform 200;
}
Interface-14
{
type epsilonWallFunction;
value uniform 200;
}
IF-BC-IN
{
type cyclicAMI;
// value uniform 200;
}
Interface-15
{
type epsilonWallFunction;
value $internalField;
}
EXTRUSION-inlet-layer
{
type epsilonWallFunction;
value $internalField;
}
HUB
{
type epsilonWallFunction;
value $internalField;
}
BLADE-FRONT
{
type epsilonWallFunction;
value $internalField;
}
BLADE
{
type epsilonWallFunction;
value $internalField;
}
TIP
{
type epsilonWallFunction;
value $internalField;
}
SHROUD
{
type epsilonWallFunction;
value $internalField;
}
TRM_SRF
{
type epsilonWallFunction;
value $internalField;
}
EXTRUSION
{
type epsilonWallFunction;
value $internalField;
}
Wall
{
type epsilonWallFunction;
value $internalField;
}
IF-U-PUMP
{
type cyclicAMI;
// value uniform 200;
}
Outlet
{
type zeroGradient;
// value uniform 200;
// type inletOutlet;
// inletValue $internalField;
// value $internalField;
}
Volute_Mixing_Interface
{
type cyclicAMI;
// value uniform 200;
}
}
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.0.0 |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class volScalarField;
location "0";
object nut;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
dimensions [0 2 -1 0 0 0 0];
internalField uniform 0.1;
boundaryField
{
FLUID-INLET-LAYER
{
type calculated;
value uniform 0;
}
IF-ROTOR-STATOR
{
type cyclicAMI;
value uniform 0;
}
Interface-14
{
type nutkWallFunction;
value uniform 0;
}
IF-BC-IN
{
type cyclicAMI;
value uniform 0;
}
Interface-15
{
type nutkWallFunction;
value uniform 0;
}
EXTRUSION-inlet-layer
{
type nutkWallFunction;
value $internalField;
}
HUB
{
type nutkWallFunction;
value $internalField;
}
BLADE-FRONT
{
type nutkWallFunction;
value $internalField;
}
BLADE
{
type nutkWallFunction;
value $internalField;
}
TIP
{
type nutkWallFunction;
value $internalField;
}
SHROUD
{
type nutkWallFunction;
value $internalField;
}
TRM_SRF
{
type nutkWallFunction;
value $internalField;
}
EXTRUSION
{
type nutkWallFunction;
value $internalField;
}
Wall
{
type nutkWallFunction;
value $internalField;
}
IF-U-PUMP
{
type cyclicAMI;
value uniform 0;
}
Outlet
{
type calculated;
value uniform 0;
}
Volute_Mixing_Interface
{
type cyclicAMI;
value uniform 0;
}
}
(6a) ./system/fvSchemes Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.0.0 |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object fvSchemes;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
ddtSchemes
{
default steadyState;
}
gradSchemes
{
default Gauss linear;
grad(p) Gauss linear;
grad(U) Gauss linear; //skewLinear;
}
divSchemes
{
// default Gauss linear;
default Gauss linear skewLinear;
// default none;
div(phi,U) bounded Gauss upwind;
// div(phi,U) Gauss vanLeerV 0 500;
// div(phi,k) Gauss limitedLinear 1;
div(phi,k) bounded Gauss upwind;
div(phi,epsilon) bounded Gauss upwind;
div((nuEff*dev(T(grad(U))))) Gauss linear;
// div((nuEff*dev(T(grad(U))))) Gauss linear;
}
laplacianSchemes
{
// default none;
// laplacian(nuEff,U) Gauss linear corrected;
// laplacian((1|A(U)),p) Gauss linear corrected;
// laplacian(DkEff,k) Gauss upwind phi uncorrected;
// laplacian(DkEff,k) Gauss linear corrected;
// laplacian(DepsilonEff,epsilon) Gauss upwind phi uncorrected;
// laplacian(DepsilonEff,epsilon) Gauss linear corrected;
// laplacian(1,p) Gauss linear corrected;
default Gauss linear limited .2;
//default Gauss linear corrected;
}
interpolationSchemes
{
default linear;
interpolate(U) linear;
}
snGradSchemes
{
default corrected;
}
fluxRequired
{
default no;
p ;
}
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 2.0.0 |
| \\ / A nd | Web: www.OpenFOAM.com |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
FoamFile
{
version 2.0;
format ascii;
class dictionary;
location "system";
object fvSolution;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
solvers
{
p
{
solver GAMG;
tolerance 1e-08;
relTol 0.05;
// nPreSweeps 0;
// nPostSweeps 2;
smoother GaussSeidel;
cacheAgglomeration true;
nCellsInCoarsestLevel 20;
agglomerator faceAreaPair;
mergeLevels 1;
}
U
{
solver smoothSolver;
smoother GaussSeidel;
nSweeps 2;
tolerance 1e-07;
relTol 0.1;
}
k
{
solver smoothSolver;
smoother GaussSeidel;
nSweeps 2;
tolerance 1e-07;
relTol 0.1;
}
epsilon
{
solver smoothSolver;
smoother GaussSeidel;
nSweeps 2;
tolerance 1e-07;
relTol 0.1;
}
Phi
{
solver GAMG;
smoother DIC;
tolerance 1e-06;
relTol 0.01;
}
}
SIMPLE
{
nNonOrthogonalCorrectors 3;
pRefCell 1000; //1000;
pRefValue 0; //0;
residualControl
{
p 1e-7;
U 1e-7;
// nuTilda 1e-5;
}
}
potentialFlow
{
nNonOrthogonalCorrectors 3;
}
relaxationFactors
{
p 0.3;
U 0.7;
k 0.3;
epsilon 0.3;
}
(7a) The simulation is not diverging, but the results are not matching with measurement data. From paraFoam I see, that there is backflow at the outlet boundary. That is not physical. No need to mention, that pressure raise is not correct. See attached figures. (7b) Output of Log-file at t=4000. Code:
Time = 4000
smoothSolver: Solving for Ux, Initial residual = 6.49334e-05, Final residual = 5.48804e-06, No Iterations 4
smoothSolver: Solving for Uy, Initial residual = 7.65739e-05, Final residual = 6.41807e-06, No Iterations 4
smoothSolver: Solving for Uz, Initial residual = 0.000245207, Final residual = 2.17271e-05, No Iterations 4
GAMG: Solving for p, Initial residual = 0.000497367, Final residual = 1.78079e-05, No Iterations 2
GAMG: Solving for p, Initial residual = 9.74022e-05, Final residual = 2.70978e-06, No Iterations 3
GAMG: Solving for p, Initial residual = 2.75499e-05, Final residual = 1.34238e-06, No Iterations 2
GAMG: Solving for p, Initial residual = 7.57486e-06, Final residual = 2.79618e-07, No Iterations 6
time step continuity errors : sum local = 5.83355e-05, global = 2.4735e-05, cumulative = -0.0134445
smoothSolver: Solving for epsilon, Initial residual = 0.000195813, Final residual = 4.18956e-06, No Iterations 2
smoothSolver: Solving for k, Initial residual = 0.000190456, Final residual = 5.48109e-06, No Iterations 2
ExecutionTime = 17569.4 s ClockTime = 17654 s
fieldValueDelta pressureDifferencePatch write:
subtract(p) = -736.583
surfaceRegion outlet_avg_p write:
areaAverage(Outlet) of p = 700
surfaceRegion outlet_avg_ptot write:
areaAverage(Outlet) of total(p) = 700.748
surfaceRegion inlet_avg_p write:
areaAverage(FLUID-INLET-LAYER) of p = -36.5828
surfaceRegion inlet_avg_ptot write:
areaAverage(FLUID-INLET-LAYER) of total(p) = -36.2725
Code:
SIMPLE: convergence criteria
field p tolerance 1e-07
field U tolerance 1e-07
Reading field p
Reading field U
Reading/calculating face flux field phi
AMI: Creating addressing and weights between 25560 source faces and 12410 target faces
AMI: Patch source sum(weights) min/max/average = 0.521354, 1.00613, 0.993977
AMI: Patch target sum(weights) min/max/average = 0.869753, 1.05489, 1.00455
AMI: Creating addressing and weights between 29880 source faces and 1185 target faces
AMI: Patch source sum(weights) min/max/average = 0.505227, 1, 0.996083
AMI: Patch target sum(weights) min/max/average = 1, 1, 1
Thanks and regards. |
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December 17, 2018, 04:01
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#3 |
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New Member
Christian Wolf
Join Date: Mar 2009
Posts: 27
Rep Power: 17 |
Oh, no one has an idea? Do I have to provide more information?
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December 17, 2018, 05:41
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#4 |
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Member
ssa
Join Date: Sep 2018
Posts: 93
Rep Power: 7 |
if backflow is the problem, try using inletoutlet boundary condition for outlet. I don't know about AMI.
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December 17, 2018, 05:57
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#5 |
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New Member
Christian Wolf
Join Date: Mar 2009
Posts: 27
Rep Power: 17 |
Thanks for your reply! Can you please be more precise? Where do I have to define the inletOutlet boundary? In file ./0/U and/or ./0/p? What about k and epsilon?
Regards |
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December 17, 2018, 06:29
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#6 |
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Member
ssa
Join Date: Sep 2018
Posts: 93
Rep Power: 7 |
for U, K and epsilon use inletOutlet for outlet patch.
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December 19, 2018, 02:12
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#7 |
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New Member
Christian Wolf
Join Date: Mar 2009
Posts: 27
Rep Power: 17 |
Hello!
I tried with inletOutlet boundary condition as mentioned above. Still, the result is unphysical. Fluid flows into the domain at outlet boundary. I wonder, why the simulation does not diverge, as mass cannot be balanced (conservation of mass). I am not sure, if the use of cyclicAMI interface is correct. I simulate a steady-state, MRF water pump. In order to connect rotor and stator domain, I use the cyclicAMI interface. Is this interface only working with rigid body motion? Is the interface appropriate to connect unconformal (vertices) meshes? |
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| Tags |
| cyclicami, mrf, simplefoam |
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