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[cfMesh] Mesh not "snapped" correctly at thin trailing edge and symmetry plane

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Old   October 22, 2021, 00:44
Question Mesh not "snapped" correctly at thin trailing edge and symmetry plane
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Supakorn Suttiruang
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Hi,


I'm having issues with cfMesh and the region near the thin trailing edge which is adjacent to the symmetry plane. I'm meshing a flying wing with very thin root trailing edge and even thinner tip trailing edge. The geometry was defined by the FMS surface mesh file.


The tip trailing edge "snaps" and define the feature correctly; however, the root trailing edge adjacent to the symmetry plane does not (even with refined surface mesh). The picture of the resulting mesh and the surface mesh (FMS) file at the problematic region is in the attachments. The tip trailing edge mesh and surface are attached as well.



The content of my meshDict file is as follows:
Code:
/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                |
| \\      /  F ield         | cfMesh: A library for mesh generation          |
|  \\    /   O peration     |                                                |
|   \\  /    A nd           | Author: Franjo Juretic                         |
|    \\/     M anipulation  | E-mail: franjo.juretic@c-fields.com            |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version   2.0;
    format    ascii;
    class     dictionary;
    location  "system";
    object    meshDict;
}

// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //

surfaceFile "Vetal.fms";

maxCellSize 2; //[m]
// minCellSize 2; //[m]
boundaryCellSize 0.5; //[m]

// objectRefinements
// {
//     mainBox
//     {
//         type box;
//         cellSize    3e-2;   //[m]
//         centre   (2.95 0 0);   //[m]
//         lengthX         6;   //[m]
//         lengthY         2;     //[m]
//         lengthZ         0.4;     //[m]
//     }
// }

localRefinement
{
    wing.main
    {
        additionalRefinementLevels 11;
        refinementThickness  1e-2; //[m]
    }
    wing.wingtip
    {
        additionalRefinementLevels 11;
        refinementThickness  1e-2; //[m]
    }
    wing.te
    {
        additionalRefinementLevels 12;
        refinementThickness  5e-4; //[m]
    }
}

// edgeMeshRefinement
// {
//     wing
//     {
//         edgeFile "Vetal_FlatTE_Half.vtk";
//         additionalRefinementLevels 14;
//         // refinementThickness 1e-3;
//     }
// }

// boundaryLayers
// {

//     patchBoundaryLayers
//     {
//         wing.*
//         {
//              nLayers    15;
//              thicknessRatio     1.05;
//              allowDiscontinuity 1;
//              // maxFirstLayerThickness 2e-5;
//         }
//     }

//     optimiseLayer 1;

//     optimisationParameters
//     {
//         nSmoothNormals             5;
//         relThicknessTol         0.4;
//         featureSizeFactor         0.8;
//         reCalculateNormals         1; 
//         maxNumIterations         5;
//     }

// }

renameBoundary
{
    defaultType     wall;

    newPatchNames
    {
        "farfield"
        {
            newName farfield;
            type    patch;
        }

    }
}

// ************************************************************************* //
My meshDict file only defines localRefinement patches, as you can see above.
Attached Images
File Type: jpg root_te_mesh.jpg (116.1 KB, 11 views)
File Type: jpg root_te_surface.jpg (180.6 KB, 12 views)
File Type: jpg tip_te_mesh.jpg (53.6 KB, 13 views)
File Type: jpg tip_te_surface.jpg (72.6 KB, 11 views)
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