[farahiam]

Hello all,
I am currently working on the external aerodynamics case for a car.
Basically, I manage to do the snappyHexMesh
However, eventhough I set the number of layers = 10, but, I fail to create even a single layer.
I dont know what is the problem with my file.
The part in sHM where I define the no.of layers are as below:

// Settings for the layer addition.
addLayersControls
{
relativeSizes true;
//relativeSizes false;

// Per final patch (so not geometry!) the layer information
layers
{
car3
{
nSurfaceLayers 3;
}
}

// Expansion factor for layer mesh
expansionRatio 1.0;

//- Wanted thickness of final added cell layer. If multiple layers
// is the
// thickness of the layer furthest away from the wall.
// Relative to undistorted size of cell outside layer.

//finalLayerThickness 0.0055; //absolute
finalLayerThickness 0.1; //relative

//- Minimum thickness of cell layer. If for any reason layer
// cannot be above minThickness do not add layer.
// Relative to undistorted size of cell outside layer.

//minThickness 0.0005; //absolute
minThickness 0.1; //relative

//- If points get not extruded do nGrow layers of connected faces that are
// also not grown. This helps convergence of the layer addition process
// close to features.
nGrow 1;


// Advanced settings

//- When not to extrude surface. 0 is flat surface, 90 is when two faces
// make straight angle.

featureAngle 15;
//featureAngle 30;

//- Maximum number of snapping relaxation iterations. Should stop
// before upon reaching a correct mesh.
nRelaxIter 3;

// Number of smoothing iterations of surface normals
nSmoothSurfaceNormals 1;

// Number of smoothing iterations of interior mesh movement direction
nSmoothNormals 3;

// Smooth layer thickness over surface patches
nSmoothThickness 10;

// Stop layer growth on highly warped cells

//maxFaceThicknessRatio 0.0025; //absolute
maxFaceThicknessRatio 1.0; //relative

// Reduce layer growth where ratio thickness to medial
// distance is large
//maxThicknessToMedialRatio 0.0015; //absolute
maxThicknessToMedialRatio 1.0; //relative

// Angle used to pick up medial axis points
minMedianAxisAngle 130;

// Create buffer region for new layer terminations
nBufferCellsNoExtrude 0;

// Overall max number of layer addition iterations
nLayerIter 50;
}


Hope someone could help me on this.
The pics of the section cuts are as attached.

Thank you.