[sihaqqi]

Greetings, I am following Tobias' exhaust manifold tutorial. When I combine all STLs into regionSTL, I cannot achieve water tight STL. In Salome, I had reached solid and meshed it according to the parameters in the video. Also, while performing snappyHexMesh, I get the error as below:

I understand that this is due to some curly bracket missing in snappyHexMeshDict but despite my numerous efforts I could not find where the error is. I have attached my Dict for anyone who can have a quick review and please guide me on this. I shall be very grateful.

--> FOAM FATAL IO ERROR:
keyword castellatedMeshControls is undefined in dictionary "/home/imad/cad/system/snappyHexMeshDict"

file: /home/imad/cad/system/snappyHexMeshDict from line 19 to line 293.

From function const Foam::dictionary& Foam::dictionary::subDict(const Foam::word&) const
in file db/dictionary/dictionary.C at line 943.

FOAM exiting

[sihaqqi]

All, I resolved the error I earlier posted but this new one has popped up and I cannot resolve it. I do not have the word mode at all in my Dict attached.

--> FOAM FATAL IO ERROR:
keyword mode is undefined in dictionary "/home/imad/cad/system/snappyHexMeshDict/castellatedMeshControls/refinementRegions/regionSTL.stl"

file: /home/imad/cad/system/snappyHexMeshDict/castellatedMeshControls/refinementRegions/regionSTL.stl from line 68 to line 82.

From function const Foam::entry& Foam::dictionary::lookupEntry(const Foam::word&, bool, bool) const
in file db/dictionary/dictionary.C at line 802.

FOAM exiting

Shall be grateful for help in resolution of this error.

[Yann]

Hi !

This error tells you exactly where the problem is:

--> FOAM FATAL IO ERROR: 
keyword mode is undefined in dictionary  "/home/imad/cad/system/snappyHexMeshDict/castellatedMeshControls/refinementRegions/regionSTL.stl"

 file: /home/imad/cad/system/snappyHexMeshDict/castellatedMeshControls/refinementRegions/regionSTL.stl from line 68 to line 82.

The "mode" parameter is missing in the refinementRegions section of your snappyHexMeshDict, line 68 to 82.

Have a look at any tutorial using snappyHexMesh, for instance the motorbike tutorial, and you will find the proper syntax to define refinementRegions:

     refinementRegions
    {
        refinementBox
        {
            mode inside;
            levels ((1E15 4));
        }
    }

The documentation will also help you to choose which mode you need to use for your case: https://cfd.direct/openfoam/user-gui...27-2020005.4.5

Cheers,
Yann

[sihaqqi]

Thanks Yann,
Just for information as I am not fluent in C++, what does double parenthesis mean in levels ((1E15 4)).

[Yann]

This is not C++ specific, this is just the syntax used by OpenFOAM. there are a double parenthesis because you can specify several distances and refinement levels, as you can see in the documentation:

sphere1 
    {                             // refinement level 5 within 1.0 m 
        mode distance;            // refinement level 3 within 2.0 m 
        levels ((1.0 5) (2.0 3)); // levels must be ordered nearest first 
    }