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[snappyHexMesh] SnappyHexMesh "Cannot open etc file"

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Old   December 4, 2018, 14:34
Unhappy SnappyHexMesh "Cannot open etc file"
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Hank Beck
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Hello, I'm a newbie to OpenFOAM who's been trying to set up a case using SnappyHexMesh on a set of STL files to try and simulate flow through a troublesome pipe system.
Originally, I attempted to modify the motorbike tutorial included with my installation, but every time I attempted to run SnappyHexMesh an error of the following form appeared:

--> FOAM FATAL IO ERROR:
Cannot open etc file "caseDicts/meshQualityDict" while reading dictionary "/home/htbeck/OpenFOAM/OpenFOAM-v1806/projects/fillingOfTank/mesh/system/snappyHexMeshDict.meshQualityControls"

After much tweaking to try and correct any issues with my dictionary files, I attempted to run the unmodified tutorial case and received the same error. Finding no answers on Google, I decided to try a different functional SnappyHexMesh case that was known to work. I downloaded the files for the "Filling of Tank" tutorial created by József Nagy and attempted to follow along with his Multiphase video series. https://www.youtube.com/watch?v=c23j...gbFRbm&index=2

Unfortunately, I ran into the same error when attempting to run SnappyHexMesh. The background mesh created by BlockMesh was created with no issues.

Is this issue a bug or beginner's mistake I keep repeating? I haven't found anyone that seems to have experienced the same error for every case they attempt.

If it matters, my dictionary headers all say I'm using version 6 while my folders say v1806. I'm running OpenFOAM on an Ubuntu bash in Windows 10.

Any advice or insight is greatly appreciated.
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Old   December 4, 2018, 18:17
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Bruno Santos
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Quick answers:
  1. Check which version of OpenFOAM you are using by running this command:
    Code:
    blockMesh -help
    If you are using OpenFOAM 6, then it will tell you something like this:
    Code:
    Using: OpenFOAM-6 (see www.OpenFOAM.org)
    Build: 6-00e347c45aa3
  2. This error:
    Code:
    Cannot open etc file "caseDicts/meshQualityDict"
    depends on what's written inside the block "meshQualityControls" in the file "snappyHexMeshDict".
  3. When in doubt for searching for working cases, you should look into the tutorials folder of the version you are using. You can usually find them by running these commands:
    Code:
    cd $FOAM_TUTORIALS
    ls -l
    find . -name snappyHexMeshDict
    1. Change to the "tutorials" folder, which only works if the OpenFOAM shell environment is activated.
    2. List files and folders in the current folder, including details about them.
    3. Find all files named "snappyHexMeshDict" in the current folder "."
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Old   December 4, 2018, 19:52
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Hank Beck
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Thank you for the tips. I actually ended up clearing out my ubuntu bash and doing a fresh install. Since doing this the included tutorial cases seem to be successfully running.

I'll make sure to look closer at how my meshQualityControls in SnappyHexMeshDict differ from the tutorial cases going forward. Hopefully this fresh installation works though.

Thanks again.
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Old   March 6, 2019, 14:25
Unhappy Same issue
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Eric Murphy
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Hi was wondering if this problem was ever closed out, and the source of the error found. I am having the same problem as the OP on Josef Nagy's multiphase tutorial (OpenFOAM-6 Build: 6-6257b17a4cf8).

When the #includeEtc "caseDicts/meshQualityDict" on line 21 is commented out of meshQualityDict, snappy seems to run fine until it comes time to check the final mesh and plenty of keywords remained undefined e.g. maxNonOrtho.

Is this caseDicts/meshQualityDict supposed to be an additional file that doesn't even exist?
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Old   March 6, 2019, 14:43
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Eric Murphy
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Found the solution online. I will repost the solution here, since I could not readily find it via google search.

Line 21 in meshQualityDict must be changed from

#includeEtc "caseDicts/meshQualityDict"

to

#includeEtc "caseDicts/mesh/generation/meshQualityDict"

due to changes in the etc folder structure in version 6.

Last edited by EMurphy; March 6, 2019 at 14:44. Reason: Grammar corrections/conciseness
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