[Ruonin]

Hi folks,

it has been a while since I've posted in the forum.

I'm trying to simulate a mixer tank using pimpleDyMFoam and I've seen most of the tutorials and posts here in the forum.

So I created my mesh in HELYX-OS using 3 stl files (reactor, baffle and impeller) and an additional cylinder for the rotating area around the impeller for the AMI interface.

So my workflow was:
1) create the background blockMesh in HELYX-OS
2) defined the geometry by importing the STL files taking notice of m vs mm question
3) defined the refinement in the surfaces and the cellzone for AMI as a boundary type
4) created the mesh

Here is wheere I have some doubts:
1) how many cellzones do I need to define? one for the moving part (rotor) and another for the stator?
2) I'm getting the "two regions" output from the checkMesh

********************
*    Check Mesh    *
********************
Case         : /home/hovione/OpenFOAM/hovione-2.4.0/run/AIChE2016/poc_R190/AMI/AIChE_2
Procs        : -1
Log          : /home/hovione/OpenFOAM/hovione-2.4.0/run/AIChE2016/poc_R190/AMI/AIChE_2/log/checkMesh.log
Env          : /home/hovione/OpenFOAM/OpenFOAM-2.4.0/etc/bashrc
Vendor       : /home/hovione/OpenFOAM
Paraview     : 
MachineFile  : 
Solver       : pimpleFoam
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.4.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 2.4.0-dcea1e13ff76
Exec   : checkMesh -case /home/hovione/OpenFOAM/hovione-2.4.0/run/AIChE2016/poc_R190/AMI/AIChE_2
Date   : Oct 25 2016
Time   : 09:05:19
Host   : "linux-g3o0.site"
PID    : 4533
Case   : /home/hovione/OpenFOAM/hovione-2.4.0/run/AIChE2016/poc_R190/AMI/AIChE_2
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:           126652
    faces:            303702
    internal faces:   266178
    cells:            89184
    faces per cell:   6.389935414
    boundary patches: 10
    point zones:      0
    face zones:       1
    cell zones:       1

Overall number of cells of each type:
    hexahedra:     61136
    prisms:        10663
    wedges:        0
    pyramids:      0
    tet wedges:    79
    tetrahedra:    0
    polyhedra:     17306
    Breakdown of polyhedra by number of faces:
        faces   number of cells
            4   1241
            5   957
            6   4092
            7   12
            8   8
            9   6434
           12   3846
           15   654
           18   62

Checking topology...
    Boundary definition OK.
    Cell to face addressing OK.
    Point usage OK.
    Upper triangular ordering OK.
    Face vertices OK.
   *Number of regions: 2
    The mesh has multiple regions which are not connected by any face.
  <<Writing region information to "0/cellToRegion"
  <<Writing region 0 with 57984 cells to cellSet region0
  <<Writing region 1 with 31200 cells to cellSet region1

Checking patch topology for multiply connected surfaces...
                   Patch    Faces   Points                  Surface topology
                  ffminx        0        0                        ok (empty)
                  ffmaxx        0        0                        ok (empty)
                  ffminy        0        0                        ok (empty)
                  ffmaxy        0        0                        ok (empty)
                  ffminz        0        0                        ok (empty)
                  ffmaxz      844     1040  ok (non-closed singly connected)
                 Reactor    17185    18281  ok (non-closed singly connected)
                Agitator     7247     7595  ok (non-closed singly connected)
                     AMI     5938     6031  ok (non-closed singly connected)
               AMI_slave     6310     6401  ok (non-closed singly connected)

Checking geometry...
    Overall domain bounding box (6.393430229e-05 0.001866637429 9.999999717e-10) (1.795940031 1.798140659 2)
    Mesh (non-empty, non-wedge) directions (1 1 1)
    Mesh (non-empty) directions (1 1 1)
    Boundary openness (-4.840269461e-17 -3.975040531e-17 3.313722939e-16) OK.
    Max cell openness = 3.766544567e-16 OK.
    Max aspect ratio = 11.27845022 OK.
    Minimum face area = 5.594777722e-06. Maximum face area = 0.01202032546.  Face area magnitudes OK.
    Min volume = 1.611536845e-07. Max volume = 0.001175917955.  Total volume = 4.656677265.  Cell volumes OK.
    Mesh non-orthogonality Max: 57.88898134 average: 14.58797732
    Non-orthogonality check OK.
    Face pyramids OK.
    Max skewness = 3.402232717 OK.
    Coupled point location match (average 0) OK.

Mesh OK.

End

Can anyone provided some insight into this?

Best Regards,
RC

[Ruonin]

Dare to bump!