[RemyCavecchia]

Hi,

I'm currently trying to switch from sHM to cfMesh for my case study and I was wondering if there is a way to set multilevels refinement as you can do it in sHM.

For my case study, I'm trying to mesh around a "foil" which is randomly generated and for this purpose I can't be satisfied with using only objectsRefinement and I want to use localRefinement close to my item surface.

I achieve this with no problems but I'm used to set multilevels refinement according to different surface distance in sHM and I can't find a way to do the same thing here.

Here is my first attempt with only one level:

/*--------------------------------*- 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 "airfoil.fms";

minCellSize 0.125;

maxCellSize 0.125; 

boundaryCellSize 0.125;

localRefinement
{
	"airfoil"
	{
	cellSize 7.8125e-3;
	refinementThickness 0.05;
	}
}

objectRefinements
{
	box1
	{
	type		box;
	cellSize	0.03125;
	centre		(1 0 0.005);
	lengthX 	3;
	lengthY		1.2;
	lengthZ 	0.01;
	}

	box2
	{
	type		box;
	cellSize	0.0625;
	centre		(2.7 0 0.005);
	lengthX		6.6;
	lengthY		1.4;
	lengthZ		0.01;
	}

	box3
	{
	type 		box;
	cellSize	0.125;
	centre		(11 0 0.005);
	lengthX		10;
	lengthY		1.4;
	lengthZ		0.01;
	}
}

boundaryLayers
{
//    nLayers 3;

//    thicknessRatio 1.2;

//    maxFirstLayerThickness 0.5;

    patchBoundaryLayers
    {
        "airfoil"
        {
            nLayers           10;

            thicknessRatio    1.2;

            maxFirstLayerThickness 0.2;

            allowDiscontinuity 0;
        }
   }
}

renameBoundary
{
    newPatchNames
    {
        "airfoil"
        {
            type    wall;
            newName airfoil;
        }
    }
}


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

And here is the result:


And then I tried, as I didn't find any other way to add another localRefinement on the same patch:

/*--------------------------------*- 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 "airfoil.fms";

minCellSize 0.125;

maxCellSize 0.125; 

boundaryCellSize 0.125;

localRefinement
{
	"airfoil"
	{
	cellSize 7.8125e-3;
	refinementThickness 0.05;
	}
	"airfoil"
	{
	cellSize 1.5625e-2;
	refinementThickness 0.2;
	}
}

objectRefinements
{
	box1
	{
	type		box;
	cellSize	0.03125;
	centre		(1 0 0.005);
	lengthX 	3;
	lengthY		1.2;
	lengthZ 	0.01;
	}

	box2
	{
	type		box;
	cellSize	0.0625;
	centre		(2.7 0 0.005);
	lengthX		6.6;
	lengthY		1.4;
	lengthZ		0.01;
	}

	box3
	{
	type 		box;
	cellSize	0.125;
	centre		(11 0 0.005);
	lengthX		10;
	lengthY		1.4;
	lengthZ		0.01;
	}
}

boundaryLayers
{
//    nLayers 3;

//    thicknessRatio 1.2;

//    maxFirstLayerThickness 0.5;

    patchBoundaryLayers
    {
        "airfoil"
        {
            nLayers           10;

            thicknessRatio    1.2;

            maxFirstLayerThickness 0.2;

            allowDiscontinuity 0;
        }
   }
}

renameBoundary
{
    newPatchNames
    {
        "airfoil"
        {
            type    wall;
            newName airfoil;
        }
    }
}


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

But it only took into account the last refinement:


Does anyone has any idea how can this be solved??

Thanks.

Remy.

[Fredvol]

Hi ,
I 'am also interested to get the answer to how define multi-refinementThickness on the same object.


What i'am currently doing is to declare several primitive ( box, sphere) and use one "refinementThickness" on each.



But please note that according to this post:
https://www.cfd-online.com/Forums/op...ease-read.html
,I think it is better to post your question there (use the prefix CfMesh):
https://www.cfd-online.com/Forums/op...contributions/


cheers
fred

[RemyCavecchia]

Hi Fred,

That's what I did also but not very efficient as the shape is generated randomly in my case.

Thanks for the advice, I didn't notice that there was a dedicated place for cfmesh. I'll correct that quickly.

Cheers.

Remy