[snappyHexMesh] SnappyHexMesh error: "expected but found" ... "readSTLASCII.L"

Rovs · December 5, 2014, 05:33

Hi there!
I'm tryng to meshing a cone-cylinder geometry using snappyhexmesh.
Something goes wrong.
I use blockMesh for the background mesh,and then snappy.

Code:

--> FOAM FATAL ERROR: 
while error on line 1
    expected  but found '��n?%��ff@�s�=I��<33�>;�=���<ff@�G�=�X=°s?+ۜ�33�>;�=���<33�>'

    From function triSurface::readSTLASCII(const fileName& STLfileName)
    in file triSurface/interfaces/STL/readSTLASCII.L at line 362.

FOAM exiting

I do .stl file with solidworks.
paraview can open it. What i have to do?

Thanks a lot.

chegdan · December 5, 2014, 13:35

Just for fun, try taking your STL and run something like:

Code:

surfaceMeshConvert input.stl someNameForOutput.stl

(substitute the correct names of course) to see if you can convert the file. I see this error when the "ASCII" stl is not really an ASCII file but a binary file. This utility will take your file, convert, and output a true ASCII file....in theory.

Rovs · December 6, 2014, 13:16

Thanks for your reply!

It seemed to work, snappyhexmesh goes ,but with CheckMesh i noticed that my new Surface has 0 cells...how could it happen?

Code:

/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  2.3.0                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 2.3.0-f5222ca19ce6
Exec   : checkMesh
Date   : Dec 06 2014
Time   : 18:13:31
Host   : "federico-S551LB"
PID    : 3186
Case   : /home/federico/Documenti/skyward/CFD/SnappyHexMesh
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 = 1

Time = 1

Mesh stats
    points:           1307851
    faces:            3851136
    internal faces:   3779712
    cells:            1271808
    faces per cell:   6
    boundary patches: 7
    point zones:      0
    face zones:       0
    cell zones:       0

Overall number of cells of each type:
    hexahedra:     1271808
    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                  
    outlet              9216     9409     ok (non-closed singly connected)  
    inlet               9216     9409     ok (non-closed singly connected)  
    bottom              13248    13483    ok (non-closed singly connected)  
    top                 13248    13483    ok (non-closed singly connected)  
    front               13248    13483    ok (non-closed singly connected)  
    back                13248    13483    ok (non-closed singly connected)  
    rocket              0        0        ok (empty)                        

Checking geometry...
    Overall domain bounding box (-900 -150 -150) (900 150 150)
    Mesh (non-empty, non-wedge) directions (1 1 1)
    Mesh (non-empty) directions (1 1 1)
    Boundary openness (0 -8.74514e-18 8.74514e-18) OK.
    Max cell openness = 1.89478e-16 OK.
    Max aspect ratio = 4.17408 OK.
    Minimum face area = 9.76562. Maximum face area = 40.7625.  Face area magnitudes OK.
    Min volume = 127.373. Max volume = 127.383.  Total volume = 1.62e+08.  Cell volumes OK.
    Mesh non-orthogonality Max: 0 average: 0
    Non-orthogonality check OK.
    Face pyramids OK.
    Max skewness = 6.97305e-14 OK.
    Coupled point location match (average 0) OK.

Mesh OK.

Time = 2

Mesh stats
    points:           1307851
    faces:            3851136
    internal faces:   3779712
    cells:            1271808
    faces per cell:   6
    boundary patches: 7
    point zones:      0
    face zones:       0
    cell zones:       0

Overall number of cells of each type:
    hexahedra:     1271808
    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                  
    outlet              9216     9409     ok (non-closed singly connected)  
    inlet               9216     9409     ok (non-closed singly connected)  
    bottom              13248    13483    ok (non-closed singly connected)  
    top                 13248    13483    ok (non-closed singly connected)  
    front               13248    13483    ok (non-closed singly connected)  
    back                13248    13483    ok (non-closed singly connected)  
    rocket              0        0        ok (empty)                        

Checking geometry...
    Overall domain bounding box (-900 -150 -150) (900 150 150)
    Mesh (non-empty, non-wedge) directions (1 1 1)
    Mesh (non-empty) directions (1 1 1)
    Boundary openness (0 -8.74514e-18 8.74514e-18) OK.
    Max cell openness = 1.89478e-16 OK.
    Max aspect ratio = 4.17408 OK.
    Minimum face area = 9.76562. Maximum face area = 40.7625.  Face area magnitudes OK.
    Min volume = 127.373. Max volume = 127.383.  Total volume = 1.62e+08.  Cell volumes OK.
    Mesh non-orthogonality Max: 0 average: 0
    Non-orthogonality check OK.
    Face pyramids OK.
    Max skewness = 6.97305e-14 OK.
    Coupled point location match (average 0) OK.

Mesh OK.

Time = 3

Mesh stats
    points:           1307851
    faces:            3851136
    internal faces:   3779712
    cells:            1271808
    faces per cell:   6
    boundary patches: 7
    point zones:      0
    face zones:       0
    cell zones:       0

Overall number of cells of each type:
    hexahedra:     1271808
    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                  
    outlet              9216     9409     ok (non-closed singly connected)  
    inlet               9216     9409     ok (non-closed singly connected)  
    bottom              13248    13483    ok (non-closed singly connected)  
    top                 13248    13483    ok (non-closed singly connected)  
    front               13248    13483    ok (non-closed singly connected)  
    back                13248    13483    ok (non-closed singly connected)  
    rocket              0        0        ok (empty)                        

Checking geometry...
    Overall domain bounding box (-900 -150 -150) (900 150 150)
    Mesh (non-empty, non-wedge) directions (1 1 1)
    Mesh (non-empty) directions (1 1 1)
    Boundary openness (0 -8.74514e-18 8.74514e-18) OK.
    Max cell openness = 1.89478e-16 OK.
    Max aspect ratio = 4.17408 OK.
    Minimum face area = 9.76562. Maximum face area = 40.7625.  Face area magnitudes OK.
    Min volume = 127.373. Max volume = 127.383.  Total volume = 1.62e+08.  Cell volumes OK.
    Mesh non-orthogonality Max: 0 average: 0
    Non-orthogonality check OK.
    Face pyramids OK.
    Max skewness = 6.97305e-14 OK.
    Coupled point location match (average 0) OK.

Mesh OK.

End

jhoepken · December 8, 2014, 06:13

This happens because binary STLs seem not to be that compatible to snappy & Co. So always use the ascii version of it. You can also convert them via paraview (save data).

Rovs · December 8, 2014, 06:32

Thanks for your reply.

I saved data with paraview, but the problem still exist.
My surface has 0 cells.

December 5, 2014, 05:33	SnappyHexMesh error: "expected but found" ... "readSTLASCII.L"	#1
Rovs New Member federico rovere Join Date: May 2013 Posts: 11 Rep Power: 13	Hi there! I'm tryng to meshing a cone-cylinder geometry using snappyhexmesh. Something goes wrong. I use blockMesh for the background mesh,and then snappy. Code: --> FOAM FATAL ERROR: while error on line 1 expected but found '��n?%��ff@�s�=I��<33�>;�=��<ff@�G�=�X=°s?+ۜ�33�>;�=��<33�>' From function triSurface::readSTLASCII(const fileName& STLfileName) in file triSurface/interfaces/STL/readSTLASCII.L at line 362. FOAM exiting I do .stl file with solidworks. paraview can open it. What i have to do? Thanks a lot.

December 5, 2014, 13:35		#2
chegdan Senior Member Daniel P. Combest Join Date: Mar 2009 Location: St. Louis, USA Posts: 621 Rep Power: 0	Just for fun, try taking your STL and run something like: Code: surfaceMeshConvert input.stl someNameForOutput.stl (substitute the correct names of course) to see if you can convert the file. I see this error when the "ASCII" stl is not really an ASCII file but a binary file. This utility will take your file, convert, and output a true ASCII file....in theory. saidc. likes this.

December 8, 2014, 06:13		#4
jhoepken Senior Member Jens Höpken Join Date: Apr 2009 Location: Duisburg, Germany Posts: 159 Rep Power: 17	This happens because binary STLs seem not to be that compatible to snappy & Co. So always use the ascii version of it. You can also convert them via paraview (save data). saidc. likes this. __________________ Blog: sourceflux.de/blog "The OpenFOAM Technology Primer": sourceflux.de/book Twitter: @sourceflux_de Interested in courses on OpenFOAM?

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December 8, 2014, 06:32		#5
Rovs New Member federico rovere Join Date: May 2013 Posts: 11 Rep Power: 13	Thanks for your reply. I saved data with paraview, but the problem still exist. My surface has 0 cells.