vertices
(
    (-25 0 -3)
    (5 0 -3)
    (5 6 -3)
    (-25 6 -3)
    (-25 0 3)
    (5 0 3)
    (5 6 3)
    (-25 6 3)
);

blocks
(
    hex (0 1 2 3 4 5 6 7) (60 15 15) simpleGrading (1 1 1)
);

castellatedMesh true;
snap            true;
addLayers       true;

    road
    {
        type searchableBox;
        min (-25 0 -3);
        max (5 0.3 3);
    }

    refinementSurfaces
    {
        car
        {
            // Surface-wise min and max refinement level
            level (3 6);
        }
        
        car_bottom
        {
            level (3 6);
            faceZone car_bottom;
        }
        
        car_front
        {
            level (3 6);
            faceZone car_front;
        }
        
        heatExchanger
        {
            level (8 8);
            cellZone heatExchanger;
            faceZone heatExchangerf;
        }
    }

    refinementRegions
    {
        refinementBox
        {
            mode inside;
            levels ((1E15 3));
        }
    }

// Settings for the layer addition.
addLayersControls
{
    // Are the thickness parameters below relative to the undistorted
    // size of the refined cell outside layer (true) or absolute sizes (false).
    relativeSizes true;

    // Per final patch (so not geometry!) the layer information
    layers
    {
        "(lowerWall|car).*"
        {
            nSurfaceLayers 5;
        }
    }

    // Expansion factor for layer mesh
    expansionRatio 1.3;

    //- 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.
    //  is the thickness of the layer furthest away from the wall.
    //  See relativeSizes parameter.
    finalLayerThickness 0.5;

    //- 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 0.1;