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vtkUnstructuredToFoam in OpenFOAM

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Old   February 6, 2018, 03:54
Exclamation vtkUnstructuredToFoam in OpenFOAM
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Vishwesh Ravi Shrimali
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Hi

I have a question regarding the OpenFOAM pre-processing utility - vtkUnstructuredToFoam. Now, if I understand it correctly, this utility takes a vtk Unstructured file as input and then converts it into a Polymesh.

Now, I ran a simulation using OpenFOAM and then saved the data at a particular time step (t = 0.35) in vtm format using paraView. This vtm file had all the info, mesh, U, alpha.water, etc. Again, I opened the corresponding vtu file in ParaView and saved it in vtk format. This file had all the data: U, alpha.water, points, faces, etc.

Now if I run vtkUnstructuredToFoam utility. I only get the polymesh without the boundary conditions, U, alpha.water and other parameter. But if I check the log file:

Code:
/*---------------------------------------------------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox           |
|  \\    /   O peration     | Version:  3.0.x                                 |
|   \\  /    A nd           | Web:      www.OpenFOAM.org                      |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
Build  : 3.0.x                                                                 
Exec   : vtkUnstructuredToFoam data_vtk.vtk                                    
Date   : Feb 06 2018                                                           
Time   : 14:10:26                                                              
Host   : "cgscd000ggb3t92"                                                     
PID    : 4422                                                                  
Case   : /data/cfd_ext/Student_Interns_2017/vishwesh/damBreak/data             
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                                                                    

Header   : "# vtk DataFile Version 4.0"
Title    : "vtk output"                
dataType : "ASCII"                     
line:4 tag:DATASET                     
geomType : UNSTRUCTURED_GRID           
line:5 tag:POINTS                      
Reading 4746 numbers representing 4746 coordinates.
line:1589 tag:CELLS                                
Reading 2268 cells or faces.                       
line:3859 tag:CELL_TYPES                           
Read 2268 cells;0 faces.                           
line:6129 tag:CELL_DATA                            
line:6130 tag:SCALARS                              
Reading scalar p of type float from lookup table   
line:6385 tag:VECTORS                              
Reading vector U of type float                     
line:7143 tag:FIELD                                
dataName:FieldData                                 
numArrays:5                                        
Reading field alpha.water of 2268 tuples of rank 1 
Reading field epsilon of 2268 tuples of rank 1     
Reading field k of 2268 tuples of rank 1           
Reading field nut of 2268 tuples of rank 1         
Reading field p_rgh of 2268 tuples of rank 1       
line:8414 tag:POINT_DATA                           
line:8415 tag:SCALARS                              
Reading scalar p of type float from lookup table   
line:8945 tag:VECTORS                              
Reading vector U of type float                     
line:10529 tag:FIELD                               
dataName:FieldData                                 
numArrays:5                                        
Reading field alpha.water of 4746 tuples of rank 1 
Reading field epsilon of 4746 tuples of rank 1     
Reading field k of 4746 tuples of rank 1           
Reading field nut of 4746 tuples of rank 1         
Reading field p_rgh of 4746 tuples of rank 1       
Read points:4746 cellShapes:2268 faces:0 lines:0   

Cell fields:
Read 1 vectorField fields:
Size    Name              
----    ----              
2268    U                 

Read 6 scalarField fields:
Size    Name              
----    ----              
2268    nut               
2268    alpha.water       
2268    k                 
2268    p_rgh             
2268    p                 
2268    epsilon           



Point fields:
Read 1 vectorField fields:
Size    Name              
----    ----              
4746    U                 

Read 6 scalarField fields:
Size    Name              
----    ----              
4746    nut               
4746    alpha.water       
4746    k                 
4746    p_rgh             
4746    p                 
4746    epsilon           



Other fields:
--> FOAM Warning : 
    From function polyMesh::polyMesh(... construct from shapes...)
    in file meshes/polyMesh/polyMeshFromShapeMesh.C at line 625   
    Found 4744 undefined faces in mesh; adding to default patch.  
Writing mesh ...                                                  
End
Clearly the utility is able to detect the scalars and vectors present in the vtk file. Is it possible to save this data in separate files? Like a U file, an alpha.water file, etc.?

Thanks in advance for the help.
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Old   January 19, 2021, 09:05
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Hi Vishwesh, sorry to respond to a long-dead post, but did you have any luck with vtkUnstructuredToFoam? I have a similar problem, I'm trying to transfer field data into OF. The only other work-around I can think of would be to write a Python or bash script to read the field data and format it correctly for my OF boundary condition file.
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