some problems about mergepatchpairs
 

Hi,everyone,i have some problems about mergepatchpairs,my model is a Hex windfarm,and i turn it into 2 blocks along z direction,my blockmeshdict as following:convertToMeters 1;

vertices
(
( 581321 4.78537e+06 930)
( 582290 4.78537e+06 930)
( 582290 4.78624e+06 930)
( 581321 4.78624e+06 930)
( 581321 4.78537e+06 1030)
( 582290 4.78537e+06 1030)
( 582290 4.78624e+06 1030)
( 581321 4.78624e+06 1030)
( 581321 4.78537e+06 2000)
( 582290 4.78537e+06 2000)
( 582290 4.78624e+06 2000)
( 581321 4.78624e+06 2000)

);

blocks
(
hex (0 1 2 3 4 5 6 7) (30 30 25) simpleGrading (1 1 1)
hex (4 5 6 7 8 9 10 11) (30 30 30) simpleGrading (1 1 1)
);

edges
(
);

patches
(
patch outlet
(
(2 6 5 1)
(6 10 9 5)

)
patch sides
(
(1 5 4 0)
(5 9 8 4)
(3 7 6 2)
(7 11 10 6)
)
patch inlet
(
(0 4 7 3)
(4 8 11 7)
)
wall ground
(
(0 3 2 1)
)
patch top
(
(8 9 10 11)
)
patch interface1
(
(4 5 6 7)
)
patch interface2
(
(4 7 6 5)
)
);

mergePatchPairs
(
(interface1 interface2)
);
who can help me to find the error?thank a lot .