[KotRainer11]

Dear Foamers,

I want to simulate a simple compressor where a piston is compressing a fluid and transporting it into a channel. Since this is nearly the same as in a two-stroke engine, I used the engineTopoChangerMesh simpleTwoStroke. At first, I want to simulate a simple 2D case. Please see the initial Setup at top bottom center in the figure -180.png attached.
My engineGeometry file looks as follows:

 
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | foam-extend: Open Source CFD                    |
|  \\    /   O peration     | Version:     4.0                                |
|   \\  /    A nd           | Web:         http://www.foam-extend.org         |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       dictionary;
    location    "constant";
    object      engineGeometry;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
//engineMesh     layered;
engineTopoChangerMesh      simpleTwoStroke;
//engineTopoChangerMesh      layerAR;

conRodLength    conRodLength [ 0 1 0 0 0 0 0 ] 0.35;
bore            bore [ 0 1 0 0 0 0 0 ] 0.5;
stroke          stroke [ 0 1 0 0 0 0 0 ] 0.15;
clearance       clearance [ 0 1 0 0 0 0 0 ] 0.002;
rpm             rpm [ 0 0 -1 0 0 0 0 ] 735;
cylinderHead cylinderHead;
piston
{
 patch piston;
 coordinateSystem
 {
  origin (0 0 0);
  coordinateRotation
  {
   type axes;
   e1 (1 0 0);
   e2 (0 1 0);
   e3 (0 0 1);
  }
  
 }
 minLayer 0.0005;
 maxLayer 0.002;
}
deformAngle 38;
delta  0.001;
offSet  0.002;
checkMesh on;
scavInCylPatch liner;
scavInPortPatch scavenging;
scavPortsTol 1e-3;
coordinateSystem
    {
        type            cartesian;
        origin          (0 0 0);
        axis            (0 0 1);
        direction       (0 1 0);
    }
}
// ************************************************************************* //

When I start moving the mesh with moveDyMEngineMesh, I get the follwing Output for the first two time steps:

 
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | foam-extend: Open Source CFD                    |
|  \\    /   O peration     | Version:     4.0                                |
|   \\  /    A nd           | Web:         http://www.foam-extend.org         |
|    \\/     M anipulation  | For copyright notice see file Copyright         |
\*---------------------------------------------------------------------------*/
Build    : 4.0-64ca3820ca97
Exec     : moveDyMEngineMesh
Date     : Apr 20 2017
Time     : 10:14:19
Host     : up720
PID      : 2610
CtrlDict : "/home/nordent/foam/nordent-4.0/run/ameria_2d_valve/system/controlDict"
Case     : /home/nordent/foam/nordent-4.0/run/ameria_2d_valve
nProcs   : 1
SigFpe   : Enabling floating point exception trapping (FOAM_SIGFPE).
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create engine time
Create mesh
Selecting engineTopoChangerMesh simpleTwoStroke
checkAndCalculate()
piston
cylinderHead
liner
valve
scavenging
outlet
front
back
deckHeight: 0.152
piston position: 0
Time = -180
Adding zones to the engine mesh
Adding face zone for piston layer addition/removal
Number of head points = 502
Number of cells in the moving region: 38000
Adding 2 point, 4 face zones and 1 cell zones
Adding 2 topology modifiers
piston face index = 0
virtualPistonPosition = 0.002
piston position = 0
Time = -179.5
Sliding interfaces decoupled
Executing layer action
virtualPistonPosition = 0.00200224, deckHeight = 0.152, pistonPosition = 0
Piston layering mode
Coupling sliding interfaces
Sliding interfaces coupled: 1
volume continuity errors : volume = 0.00162, old volume = 0.00162, max error = 2.77933e-14, sum local = 2.50461e-19, global = 6.25311e-21
Mesh Courant Number mean: 0.00137621 max: 0.00448766
    Point usage OK.
    Upper triangular ordering OK.
    Topological cell zip-up check OK.
    Face vertices OK.
    Face-face connectivity OK.
    Mesh topology OK.
    Boundary openness (-4.24201e-18 1.64967e-15 -3.01046e-18) Threshold = 1e-06 OK.
    Max cell openness = 1.05879e-16 OK.
    Max aspect ratio = 20.0449 OK.
    Minumum face area = 1e-06. Maximum face area = 4e-05.  Face area magnitudes OK.
    Min volume = 2e-08. Max volume = 4e-08.  Total volume = 0.00162.  Cell volumes OK.
    Mesh non-orthogonality Max: 0.128562 average: 0.00225346 Threshold = 70
    Non-orthogonality check OK.
    Face pyramids OK.
    Max skewness = 0.00224382 OK.
    Mesh geometry OK.
Mesh OK.
ExecutionTime = 1.24 s  ClockTime = 1 s
Time = -179
Decoupling sliding interfaces
sliding interfaces successfully decoupled!!!
Executing layer action
virtualPistonPosition = 0.00200898, deckHeight = 0.152, pistonPosition = 2.24383e-06
Piston layering mode
Coupling sliding interfaces
Sliding interfaces coupled: 1
volume continuity errors : volume = 0.00162, old volume = 0.00162, max error = 1.86943e-14, sum local = 3.05258e-19, global = 2.81601e-23
Mesh Courant Number mean: 0.00412862 max: 0.0134629
    Point usage OK.
    Upper triangular ordering OK.
    Topological cell zip-up check OK.
    Face vertices OK.
    Face-face connectivity OK.
    Mesh topology OK.
    Boundary openness (-4.24201e-18 1.64967e-15 -3.01046e-18) Threshold = 1e-06 OK.
    Max cell openness = 1.05879e-16 OK.
    Max aspect ratio = 20.1795 OK.
    Minumum face area = 1e-06. Maximum face area = 4e-05.  Face area magnitudes OK.
    Min volume = 2e-08. Max volume = 4e-08.  Total volume = 0.00162.  Cell volumes OK.
    Mesh non-orthogonality Max: 0.514232 average: 0.00901361 Threshold = 70
    Non-orthogonality check OK.
    Face pyramids OK.
    Max skewness = 0.00897456 OK.
    Mesh geometry OK.
Mesh OK.
ExecutionTime = 2.64 s  ClockTime = 3 s

Unfortunately, no layer addition/removal is happening and the whole compressor cylinder domain is moving.The attached Picture 0.png Shows the mesh at the end of the simulation (TDC). I do not know why this is happening. Could you please support me with my case setup? Please let me know if further Information is required.

Thanks in advance.