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Old   October 27, 2022, 19:00
Default Problem with blockMesh
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Yoshi Yagi
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Hi All,

I am totally new to the world of openFoam and I have been trying to follow along with this tutorial:

In particular, I am stuck on step 4 in which the tutorial asks me to run "blockMesh." My problem is that I am running into fatal errors when I run "blockMesh" in the terminal. I am using Ubuntu 22 and OpenFOAM 10.

I have tried running blockMesh from different directories within the precursor folder, but always end up with some Fatal Error.

These are the errors I am getting:

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

Not deleting polyMesh directory
because it contains blockMeshDict
Reading "blockMeshDict"

Cannot find file "system/blockMeshDict"

From function int main(int, char**)
in file blockMesh.C at line 159.

FOAM exiting
************************************************** ***********************************

Upon looking at the "/home/yoshiyagi/eddylicious/tutorials/channel_flow_lund_rescaling/precursor/system" folder, I indeed cannot find the file "blockMeshDict"

However, I do see a file named "blockMeshDict" in /home/yoshiyagi/eddylicious/tutorials/channel_flow_lund_rescaling/precursor/constant/polyMesh.

These are the files in the polyMesh folder:

blockMeshDict blockMeshDict.template

I tried running "blockMesh" wtihin the above directory, but got another error:

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time

cannot find file "/home/yoshiyagi/eddylicious/tutorials/channel_flow_lund_rescaling/precursor/constant/polyMesh/system/controlDict"

From function virtual Foam::autoPtr<Foam::ISstream> Foam::fileOperations::uncollatedFileOperation::rea dStream(Foam::regIOobject&, const Foam::fileName&, const Foam::word&, bool) const
in file global/fileOperations/uncollatedFileOperation/uncollatedFileOperation.C at line 539.

FOAM exiting
************************************************** ***************

I am at a loss in this tutorial as I think I have tried running blockMesh in other directories, but always get an error. Perhaps this issue is due to my inexperience with openFOAM and that I do not have the right environment or I am not calling blockMesh properly?

Any help would be greatly appreciated. I also wanted to add that I also tried running the above commands using "sudo."
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Old   October 27, 2022, 19:20
Default Update: I got blockMesh to run, but I am not sure if what I did was okay.
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Yoshi Yagi
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I got blockMesh to run, but I am not sure if what I did was the right thing to do. I noticed that my errors were related to the directory "system/blockMeshDict".

So, what I did was copy the "system" folder to within the "/home/yoshiyagi/eddylicious/tutorial/channel_flow_lund_rescaling/precursor/constant/polyMesh". I did this because the "controlDict" file was within the "system" folder, but the "system" folder was not located in the same directory as "blockMeshDict".

I also had to copy "blockMeshDict" into the copied "system" folder. This is what my directory and its contents looks like now:

************************************************** ***********

This is where I ran blockMesh and it worked.

This is where I added the files blockMeshDict

the contents are:

blockMeshDict decomposeParDict fvOptions fvSolution
controlDict decomposeParDict~ fvSchemes sampleDict

************************************************** *********************************

blockMesh now works, but could someone confirm if this was the right method to getting blockMesh to work?
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Old   November 7, 2022, 06:49
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That is correct. Your case needs to have three folder: 0, constant and system. If these are not present, an error is produced. Within the different folders, you place your dictionaries.

It seems you're quite new to this, so I'd recommend you to watch some videos on youtube, e.g.
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