[SayHii2Hades]

Can someone tell me how to better the mesh for my c-type domain in blockMesh. As I am new to this and still not understanding how to make the mesh better for my tandem airfoil configuration. Like how to get better results for orthogonality, aspect ratio, skewness or is there something else that I should know about?

blockMeshDict


/*--------------------------------*- C++ -*----------------------------------*\
========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Version: 9
\\/ M anipulation |
\*---------------------------------------------------------------------------*/
FoamFile
{
format ascii;
class dictionary;
object blockMeshDict;
}

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

convertToMeters 1;

vertices
//trying to make a curve
//C = chord lenght of the main airfoil
//15C downstream
//lateral 20C
//have to take a reference from some paper
(
(0 -0.2 -10) //0
(15 -0.2 -10) //1 //back
(15 0.2 -10) //2 //back
(0 0.2 -10) //3
(0 -0.2 10) //4
(15 -0.2 10) //5 //back
(15 0.2 10) //6 //back
(0 0.2 10) //7
);

blocks
//simpleGrading 1st point: ratio of 1st to last
(
hex (0 1 2 3 4 5 6 7)
(40 1 40)
simpleGrading
(
(
(0.2 0.4 1) (0.6 0.3 0.25) (0.2 0.4 1)
)
1
(
(0.2 0.4 1) (0.6 0.3 0.25) (0.2 0.4 1)
)
)
);

edges
(
//arc reasoning where v1 = the vertex of arc start and || v2= is the vertex of arc end.
// arc v1 v2 ((the distance away from the edge you want to make an arc) (same as the vertice as it the extrude point) (midpoint of the edge))
arc 0 4 (-10 -0.2 0)
arc 3 7 (-10 0.2 0)
);

boundary
(
back
{
type patch;
faces
(
(3 7 6 2)


);
}
front
{
type patch;
faces
(
(1 5 4 0)
);
}
inlet
{
type patch;
inGroups (freestream);
faces
(
(0 4 7 3)
(4 5 6 7)
(0 3 2 1)

);
}
outlet
{
type patch;
inGroups (freestream);
faces
(
(2 6 5 1)
);
}
);

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