CFD Online Discussion Forums - [blockMesh] Strange Block Mesh results

Hi to evrybody!
I'm trying to simulate a 2D supersonic nozzle internal flow with sonicFoam, and the mesh is done with blockMesh.
I obtained no errors from checkMesh, but when I toke a look on it I found strange results from blockMesh, in particular some few cells are "oblique", while the others are allmost perpendicular to the nozzle wall. Moreover, when I try to refine the mesh, those oblique cells began self-intersecting, destroing the mesh.
The blockMeshDict is:

convertToMeters 1;

vertices
(
(-10 0 0) //0
(-3.45 0 0 ) //1
(-3.45 0.56418958 0) //2
(-10 0.56418958 0) //3
(-10 0 1) //4
(-3.45 0 1) //5
(-3.45 0.56418958 1)//6
(-10 0.56418958 1) //7
(0 0 0) //8
(0 0.3282429590 0) //9
(0 0 1) //10
(0 0.3282429590 1) //11
(3.55 0 0) //12
(3.55 0.413274 0) //13
(3.55 0 1) //14
(3.55 0.413274 1) //15
(10 0 0) //16
(10 0.413274 0) //17
(10 0 1) //18
(10 0.413274 1) //19
);

blocks
(
hex (0 1 2 3 4 5 6 7) (100 40 1) simpleGrading (1 1 1)
hex (1 8 9 2 5 10 11 6) (100 40 1) simpleGrading (0.3 1 1)
hex (8 12 13 9 10 14 15 11) (100 40 1) simpleGrading (3 1 1)
hex (12 16 17 13 14 18 19 15) (100 40 1) simpleGrading (1 1 1)
);

edges
(
simpleSpline 2 9 ((-3.4 0.5641895835 0)(-3.35 0.5641895835 0)(-3.3 0.5641895834 0)(-3.25 0.5641895833 0)(-3.2 0.5641895830 0)(-3.15 0.5641895826 0)(-3.1 0.5641895818 0)(-3.05 0.5641895804 0)(-3 0.5641895780 0)(-2.95 0.5641895737 0)(-2.9 0.5641895662 0)(-2.85 0.5641895534 0)(-2.8 0.5641895316 0)(-2.75 0.5641894950 0)(-2.7 0.5641894339 0)(-2.65 0.5641893331 0)(-2.6 0.5641891683 0)(-2.55 0.5641889019 0)(-2.5 0.5641884751 0)(-2.45 0.5641877984 0)(-2.4 0.5641867361 0)(-2.35 0.5641850852 0)(-2.3 0.5641825452 0)(-2.25 0.5641786766 0)(-2.2 0.5641728434 0)(-2.15 0.5641641366 0)(-2.1 0.5641512718 0)(-2.05 0.5641324556 0)(-2 0.5641052134 0)(-1.95 0.5640661730 0)(-1.9 0.5640107945 0)(-1.85 0.5639330422 0)(-1.8 0.5638249938 0)(-1.75 0.5636763840 0)(-1.7 0.5634740868 0)(-1.65 0.5632015420 0)(-1.6 0.5628381434 0)(-1.55 0.5623586092 0)(-1.5 0.5617323671 0)(-1.45 0.5609229953 0)(-1.4 0.5598877670 0)(-1.35 0.5585773570 0)(-1.3 0.5569357698 0)(-1.25 0.5549005550 0)(-1.2 0.5524033701 0)(-1.15 0.5493709486 0)(-1.1 0.5457265206 0)(-1.05 0.5413917216 0)(-1 0.5362890097 0)(-0.95 0.5303445956 0)(-0.9 0.5234918756 0)(-0.85 0.5156753410 0)(-0.8 0.5068549276 0)(-0.75 0.4970107562 0)(-0.7 0.4861482104 0)(-0.65 0.4743032841 0)(-0.6 0.4615481158 0)(-0.55 0.4479965870 0)(-0.5 0.4338097895 0)(-0.45 0.4192010227 0)(-0.4 0.4044397382 0)(-0.35 0.3898534625 0)(-0.3 0.3758261786 0)(-0.25 0.3627910203 0)(-0.2 0.3512146616 0)(-0.15 0.3415710272 0)(-0.1 0.3343036401 0)(-0.05 0.3297795792 0))
simpleSpline 6 11 ((-3.4 0.5641895835 1)(-3.35 0.5641895835 1)(-3.3 0.5641895834 1)(-3.25 0.5641895833 1)(-3.2 0.5641895830 1)(-3.15 0.5641895826 1)(-3.1 0.5641895818 1)(-3.05 0.5641895804 1)(-3 0.5641895780 1)(-2.95 0.5641895737 1)(-2.9 0.5641895662 1)(-2.85 0.5641895534 1)(-2.8 0.5641895316 1)(-2.75 0.5641894950 1)(-2.7 0.5641894339 1)(-2.65 0.5641893331 1)(-2.6 0.5641891683 1)(-2.55 0.5641889019 1)(-2.5 0.56418847511 1)(-2.45 0.5641877984 1)(-2.4 0.5641867361 1)(-2.35 0.5641850852 1)(-2.3 0.5641825452 1)(-2.25 0.5641786766 1)(-2.2 0.5641728434 1)(-2.15 0.5641641366 1)(-2.1 0.5641512718 1)(-2.05 0.5641324556 1)(-2 0.5641052134 1)(-1.95 0.5640661730 1)(-1.9 0.5640107945 1)(-1.85 0.5639330422 1)(-1.8 0.5638249938 1)(-1.75 0.5636763840 1)(-1.7 0.5634740868 1)(-1.65 0.5632015420 1)(-1.6 0.5628381434 1)(-1.55 0.5623586092 1)(-1.5 0.5617323671 1)(-1.45 0.5609229953 1)(-1.4 0.5598877670 1)(-1.35 0.5585773570 1)(-1.3 0.5569357698 1)(-1.25 0.5549005550 1)(-1.2 0.5524033701 1)(-1.15 0.5493709486 1)(-1.1 0.5457265206 1)(-1.05 0.5413917216 1)(-1 0.5362890097 1)(-0.95 0.5303445956 1)(-0.9 0.5234918756 1)(-0.85 0.5156753410 1)(-0.8 0.5068549276 1)(-0.75 0.4970107562 1)(-0.7 0.4861482104 1)(-0.65 0.4743032841 1)(-0.6 0.4615481158 1)(-0.55 0.4479965870 1)(-0.5 0.4338097895 1)(-0.45 0.4192010227 1)(-0.4 0.4044397382 1)(-0.35 0.3898534625 1)(-0.3 0.3758261786 1)(-0.25 0.3627910203 1)(-0.2 0.3512146616 1)(-0.15 0.3415710272 1)(-0.1 0.3343036401 1)(-0.05 0.3297795792 1))
simpleSpline 9 13 ((0.05 0.3287038432 0)(0.1 0.3300694627 0)(0.15 0.3322900376 0)(0.2 0.3352868057 0)(0.25 0.3389576923 0)(0.3 0.3431841428 0)(0.35 0.3478383237 0)(0.4 0.3527900008 0)(0.45 0.3579125817 0)(0.5 0.3630880209 0)(0.55 0.3682104702 0)(0.6 0.3731887005 0)(0.65 0.3779474100 0)(0.7 0.3824275823 0)(0.75 0.3865860760 0)(0.8 0.3903946228 0)(0.85 0.3938383975 0)(0.9 0.3969143083 0)(0.95 0.3996291311 0)(1 0.4019975956 0)(1.05 0.4040405108 0)(1.1 0.4057830000 0)(1.15 0.4072528979 0)(1.2 0.4084793465 0)(1.25 0.4094916119 0)(1.3 0.4103181307 0)(1.35 0.4109857817 0)(1.4 0.4115193694 0)(1.45 0.4119412993 0)(1.5 0.4122714179 0)(1.55 0.4125269883 0)(1.6 0.4127227724 0)(1.65 0.4128711899 0)(1.7 0.4129825292 0)(1.75 0.4130651866 0)(1.8 0.4131259159 0)(1.85 0.4131700743 0)(1.9 0.4132018533 0)(1.95 0.4132244888 0)(2 0.4132404468 0)(2.05 0.4132515826 0)(2.1 0.4132592742 0)(2.15 0.4132645331 0)(2.2 0.4132680923 0)(2.25 0.4132704768 0)(2.3 0.4132720582 0)(2.35 0.4132730965 0)(2.4 0.4132737714 0)(2.45 0.4132742057 0)(2.5 0.4132744823 0)(2.55 0.4132746568 0)(2.6 0.4132747657 0)(2.65 0.4132748330 0)(2.7 0.4132748742 0)(2.75 0.4132748992 0)(2.8 0.4132749142 0)(2.85 0.4132749231 0)(2.9 0.4132749283 0)(2.95 0.4132749314 0)(3 0.4132749332 0)(3.05 0.4132749342 0)(3.1 0.4132749347 0)(3.15 0.4132749350 0)(3.2 0.4132749352 0)(3.25 0.4132749353 0)(3.3 0.4132749354 0)(3.35 0.4132749354 0)(3.4 0.4132749354 0)(3.45 0.4132749354 0)(3.5 0.4132749354 0))
simpleSpline 11 15 ((0.05 0.3287038432 1)(0.1 0.3300694627 1)(0.15 0.3322900376 1)(0.2 0.3352868057 1)(0.25 0.3389576923 1)(0.3 0.3431841428 1)(0.35 0.3478383237 1)(0.4 0.3527900008 1)(0.45 0.3579125817 1)(0.5 0.3630880209 1)(0.55 0.3682104702 1)(0.6 0.3731887005 1)(0.65 0.3779474100 1)(0.7 0.3824275823 1)(0.75 0.3865860760 1)(0.8 0.3903946228 1)(0.85 0.3938383975 1)(0.9 0.3969143083 1)(0.95 0.3996291311 1)(1 0.4019975956 1)(1.05 0.4040405108 1)(1.1 0.4057830000 1)(1.15 0.4072528979 1)(1.2 0.4084793465 1)(1.25 0.4094916119 1)(1.3 0.4103181307 1)(1.35 0.4109857817 1)(1.4 0.4115193694 1)(1.45 0.4119412993 1)(1.5 0.4122714179 1)(1.55 0.4125269883 1)(1.6 0.4127227724 1)(1.65 0.4128711899 1)(1.7 0.4129825292 1)(1.75 0.4130651866 1)(1.8 0.4131259159 1)(1.85 0.4131700743 1)(1.9 0.4132018533 1)(1.95 0.4132244888 1)(2 0.4132404468 1)(2.05 0.4132515826 1)(2.1 0.4132592742 1)(2.15 0.4132645331 1)(2.2 0.4132680923 1)(2.25 0.4132704768 1)(2.3 0.4132720582 1)(2.35 0.4132730965 1)(2.4 0.4132737714 1)(2.45 0.4132742057 1)(2.5 0.4132744823 1)(2.55 0.4132746568 1)(2.6 0.4132747657 1)(2.65 0.4132748330 1)(2.7 0.4132748742 1)(2.75 0.4132748992 1)(2.8 0.4132749142 1)(2.85 0.4132749231 1)(2.9 0.4132749283 1)(2.95 0.4132749314 1)(3 0.4132749332 1)(3.05 0.4132749342 1)(3.1 0.4132749347 1)(3.15 0.4132749350 1)(3.2 0.4132749352 1)(3.25 0.4132749353 1)(3.3 0.4132749354 1)(3.35 0.4132749354 1)(3.4 0.4132749354 1)(3.45 0.4132749354 1)(3.5 0.4132749354 1))
);

patches
(
empty frontAndBack
(
(4 5 6 7)
(5 10 11 6)
(10 14 15 11)
(14 18 19 15)
(0 3 2 1)
(1 2 9 8)
(8 9 13 12)
(12 13 17 16)
)

patch inlet
(
(4 7 3 0)
)
patch outlet
(
(19 18 16 17)
)
symmetryPlane bottom
(
(1 5 4 0)
(8 10 5 1)
(12 14 10 8)
(16 18 14 12)
)
patch top
(
(6 2 3 7)
(11 9 2 6)
(15 13 9 11)
(19 17 13 15)
)
);

mergePatchPairs
(
);

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

Has anyone an idea on what's goin' on?
Thank you,
Ivan