[Gmsh] cannot bind multiple regions to single tag

[Lik Chuan Lee]

Hi,

When I tried to join 2 volumes by "BooleanUnion" in the last line of the
following code, it has an error "cannot bind multiple regions to single tag
15". Does anybody know what that error means?

Thanks.


SetFactory("OpenCASCADE");

h = 2.00;

LVirad = 3.0;
LVthick = 1.0;
LVolength = 6.0;

LVorad = LVirad + LVthick;
LVilength = LVolength - LVthick;

RV_offset = 3.0;
RVirad = 3.0;
RVthick = 0.5;
RVolength = 5.0;

RVorad = RVirad + RVthick;
RVilength = RVolength - RVthick;

diam = LVorad+LVolength;
bx = -LVolength;
by = -LVolength;

Box(1) = {0.0, bx, by, diam, diam, diam};
Sphere(2) = {0.0, 0.0, 0.0, 1.0};
Dilate {{0.0, 0.0 ,0.0}, {LVolength, LVorad, LVorad}}{
        Volume{2};
}

BooleanDifference(3) = {Volume{2}; Delete;}{Volume{1};};

Sphere(4) = {0.0, 0.0, 0.0, 1.0};
Dilate {{0.0, 0.0 ,0.0}, {LVilength, LVirad, LVirad}}{
        Volume{4};
}

BooleanDifference(5) = {Volume{4}; Delete;}{Volume{1}; Delete;};
BooleanDifference(6) = {Volume{3}; Delete;}{Volume{5}; Delete;};


Box(100) = {0.0, bx+RV_offset, by+RV_offset-2, RV_offset+2*RVorad,
RV_offset+2*RVorad, RV_offset+RVolength+2};
Sphere(7) = {0.0, RV_offset, 0.0, 1};
Dilate {{0.0, RV_offset ,0.0}, {RVorad, RVorad, RVolength}}{
        Volume{7};
}
BooleanDifference(8) = {Volume{7}; Delete;}{Volume{100}; Delete;};

Box(101) = {0.0, bx+RV_offset, by+RV_offset-2, RV_offset+2*RVirad,
RV_offset+2*RVirad, RV_offset+RVilength+2};
Sphere(9) = {0.0, RV_offset, 0.0, 1};
Dilate {{0.0, RV_offset ,0.0}, {RVirad, RVirad, RVilength}}{
        Volume{9};
}
BooleanDifference(10) = {Volume{9}; Delete;}{Volume{101}; Delete;};
BooleanDifference(11) = {Volume{8}; Delete;}{Volume{10}; Delete;};


Sphere(13) = {0.0, 0.0, 0.0, 1.0};
Dilate {{0.0, 0.0 ,0.0}, {LVolength-0.3, LVorad-0.3, LVorad-0.3}}{
        Volume{13};
}

BooleanDifference(14) = {Volume{11}; Delete;}{Volume{13}; Delete;};


BooleanUnion(15) = {Volume{6}; Delete;}{Volume{14}; Delete;};

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