[snappyHexMesh] Nothing in Paraview!

A340 · May 23, 2012, 06:25

Hey everyone,

i'm just in the middle of building a new case through combining a few case directories (i.e.majority of simpleFoam/airfoil2d and abit of snappyhexmesh/motorBike) and after performing all adjustments (updating file name)and meshing (blockMesh + snappyhexmesh) with no error, nothing seems to be appearing in Paraview. The mesh parts have the basic patches + 1 new model patch and that is all. In the Paraview, only a retangular box has appeared.

Please help me out! I have googled all over for hours and found nothing

Thanks guys

wyldckat · May 23, 2012, 06:58

Greetings Stevie and welcome to the forum!

Have you checked if the mesh even exists?

Code:

checkMesh

Additionally, have you done any of the tutorials to confirm if you have a working installation?

Best regards,
Bruno

A340 · May 23, 2012, 07:04

yea i've done the icoFoam cavity and snappyhexmesh/motorBike exercises and they both worked. And yes I did do the "checkmesh" between running blockMesh and snappyhexmesh. but nothing seems to be coming up on Paraview

wyldckat · May 23, 2012, 07:17

What about checkMesh after snappy?

A340 · May 23, 2012, 07:31

yea tried that as well. Earlier snappy was giving me an error saying - does not seem to have 8 points of equal or lower level cellPoints...etc. After changing refinement level from (5 6) to (2 5) sort of got rid of that error. And now everything is fine but nothing is coming up on Paraview. what is generally the cause when a certain mesh isn't appearing on Paraview? The blockMesh seems to be there, but not the snappy. Do you think maybe its the properties of the snappy file i have to change?

anon_a · May 23, 2012, 07:34

Just to be sure: Have you moved in the last time step in paraFoam?
Or did you use -overwrite?

EDIT: Also, which representation style is active? When I load a mesh with many cells, the "Outline" is activated by default instead of "Surface".

EDIT2: If none of these is the solution, could you upload a screenshot of your paraview screen containing the rectangle? It must also contain the visualization details on the left, off course.

A340 · May 23, 2012, 07:41

yep i clicked the forward time step to the last time step. And yea tried changing the outline, wireframe, surface and everything. Nothing seems to be appearing

wyldckat · May 23, 2012, 07:59

Which OpenFOAM are you suing?
Which ParaView version are you using?
And are they 32 or 64bit?
How many cells/points does your mesh have?
Try running paraFoam like this:
Code:
```
paraFoam -builtin
```

A340 · May 23, 2012, 08:05

OpenFoam 2.1.0
Paraview 3.12.0
64 bit
Not sure how to check the number of cell/points

wyldckat · May 23, 2012, 08:48

Quote:

Originally Posted by A340

OpenFoam 2.1.0
Paraview 3.12.0
64 bit
Not sure how to check the number of cell/points

checkMesh reports that info

A340 · May 23, 2012, 08:57

I don't know whats gone wrong, the checkmesh is giving me an error. (see attachment). This is after running snappyhexmesh

lovecraft22 · May 23, 2012, 11:20

You should probably post the error, not a screenshot of it… I cannot read anything…

wyldckat · May 23, 2012, 15:24

Quote:

Originally Posted by lovecraft22

You should probably post the error, not a screenshot of it… I cannot read anything…

Indeed... I could make out some of the issues, but there is insufficient information. I believe that 1.5 million cells are reported by snappyHexMesh at the last step, which should put aside a problem with insufficient memory.

Quote:

Originally Posted by A340

I don't know whats gone wrong, the checkmesh is giving me an error. (see attachment). This is after running snappyhexmesh

Apparently there is at least one problem. Like lovecraft22 said, please post the whole output by checkMesh:

Code:

checkMesh > log.checkMesh
tar -cjf log.checkMesh.tar.gz log.checkMesh

The last command line is only if the log file is too big... in which case, attach the file "log.checkMesh.tar.gz".

As for the error message, it looks like something is going wrong in the folder paths, since it tried to create the folder "1/sets" without success. Are you by any chance running snappyHexMesh in parallel?

Best regards,
Bruno

Doug68 · June 9, 2012, 07:09

I've managed to do this a few times in a few different ways, I'd check the following:

1. Open the mesh in Paraview then open the stl file to make sure the stl file is the correct scale and in the correct position to fit in your blockmesh range.

2. Have a look at the section in the snappyhexmesh log file similar to below:

Read mesh in = 1.716 s

Overall mesh bounding box : (0 -4 0) (20 4 4)
Relative tolerance : 1e-006
Absolute matching distance : 2.19089e-005

Reading refinement surfaces.
Read refinement surfaces in = 10.677 s

if the time numbers are zero or close to it then the stl file has not been found.

May 23, 2012, 06:25	Nothing in Paraview!	#1
A340 New Member Stevie Join Date: May 2012 Posts: 6 Rep Power: 13	Hey everyone, i'm just in the middle of building a new case through combining a few case directories (i.e.majority of simpleFoam/airfoil2d and abit of snappyhexmesh/motorBike) and after performing all adjustments (updating file name)and meshing (blockMesh + snappyhexmesh) with no error, nothing seems to be appearing in Paraview. The mesh parts have the basic patches + 1 new model patch and that is all. In the Paraview, only a retangular box has appeared. Please help me out! I have googled all over for hours and found nothing Thanks guys

May 23, 2012, 06:58		#2
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,975 Blog Entries: 45 Rep Power: 128	Greetings Stevie and welcome to the forum! Have you checked if the mesh even exists? Code: checkMesh Additionally, have you done any of the tutorials to confirm if you have a working installation? Best regards, Bruno __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

May 23, 2012, 07:17		#4
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,975 Blog Entries: 45 Rep Power: 128	What about checkMesh after snappy? __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

May 23, 2012, 07:59		#8
wyldckat Retired Super Moderator Bruno Santos Join Date: Mar 2009 Location: Lisbon, Portugal Posts: 10,975 Blog Entries: 45 Rep Power: 128	Which OpenFOAM are you suing? Which ParaView version are you using? And are they 32 or 64bit? How many cells/points does your mesh have? Try running paraFoam like this: Code: paraFoam -builtin __________________ OpenFOAM: FAQ \| Getting started Forum: How to get help, to post code/output and forum guide Read this before sending me PM

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May 23, 2012, 07:04		#3
A340 New Member Stevie Join Date: May 2012 Posts: 6 Rep Power: 13	yea i've done the icoFoam cavity and snappyhexmesh/motorBike exercises and they both worked. And yes I did do the "checkmesh" between running blockMesh and snappyhexmesh. but nothing seems to be coming up on Paraview

May 23, 2012, 07:31		#5
A340 New Member Stevie Join Date: May 2012 Posts: 6 Rep Power: 13	yea tried that as well. Earlier snappy was giving me an error saying - does not seem to have 8 points of equal or lower level cellPoints...etc. After changing refinement level from (5 6) to (2 5) sort of got rid of that error. And now everything is fine but nothing is coming up on Paraview. what is generally the cause when a certain mesh isn't appearing on Paraview? The blockMesh seems to be there, but not the snappy. Do you think maybe its the properties of the snappy file i have to change?

May 23, 2012, 07:34		#6
anon_a Disabled Join Date: Mar 2011 Posts: 174 Rep Power: 15	Just to be sure: Have you moved in the last time step in paraFoam? Or did you use -overwrite? EDIT: Also, which representation style is active? When I load a mesh with many cells, the "Outline" is activated by default instead of "Surface". EDIT2: If none of these is the solution, could you upload a screenshot of your paraview screen containing the rectangle? It must also contain the visualization details on the left, off course.

May 23, 2012, 07:41		#7
A340 New Member Stevie Join Date: May 2012 Posts: 6 Rep Power: 13	yep i clicked the forward time step to the last time step. And yea tried changing the outline, wireframe, surface and everything. Nothing seems to be appearing

May 23, 2012, 08:05		#9
A340 New Member Stevie Join Date: May 2012 Posts: 6 Rep Power: 13	OpenFoam 2.1.0 Paraview 3.12.0 64 bit Not sure how to check the number of cell/points

May 23, 2012, 11:20		#12
lovecraft22 Senior Member lore Join Date: Mar 2010 Location: Italy Posts: 460 Rep Power: 18	You should probably post the error, not a screenshot of it… I cannot read anything…

June 9, 2012, 07:09		#14
Doug68 Member Join Date: Nov 2010 Posts: 62 Rep Power: 15	I've managed to do this a few times in a few different ways, I'd check the following: 1. Open the mesh in Paraview then open the stl file to make sure the stl file is the correct scale and in the correct position to fit in your blockmesh range. 2. Have a look at the section in the snappyhexmesh log file similar to below: Read mesh in = 1.716 s Overall mesh bounding box : (0 -4 0) (20 4 4) Relative tolerance : 1e-006 Absolute matching distance : 2.19089e-005 Reading refinement surfaces. Read refinement surfaces in = 10.677 s if the time numbers are zero or close to it then the stl file has not been found.