Merge branch 'new_stencil' into 'master'

implemented unconventional D3Q27 stencil by Abbas Fakhari

See merge request !7

lbmpy/stencils.py

@@ -83,6 +83,12 @@ get_stencil.data = {
                      (1, 0, 1), (-1, 0, 1), (1, 0, -1), (-1, 0, -1),
                      (0, 1, 1), (0, -1, 1), (0, 1, -1), (0, -1, -1),
                      (1, 1, 1), (-1, 1, 1), (1, -1, 1), (-1, -1, 1),
-                     (1, 1, -1), (-1, 1, -1), (1, -1, -1), (-1, -1, -1))
+                     (1, 1, -1), (-1, 1, -1), (1, -1, -1), (-1, -1, -1)),
+        'fakhari': ((0, 0, 0),
+                    (1, 0, 0), (-1, 0, 0), (0, 1, 0), (0, -1, 0), (0, 0, 1), (0, 0, -1),
+                    (1, 1, 1), (-1, 1, 1), (1, -1, 1), (-1, -1, 1),
+                    (1, 1, -1), (-1, 1, -1), (1, -1, -1), (-1, -1, -1),
+                    (1, 1, 0), (-1, 1, 0), (1, -1, 0), (-1, -1, 0),
+                    (1, 0, 1), (-1, 0, 1), (1, 0, -1), (-1, 0, -1), (0, 1, 1), (0, -1, 1), (0, 1, -1), (0, -1, -1)),
     }
 }

lbmpy_tests/test_stencils.py

@@ -26,6 +26,8 @@ def get_all_stencils():
         s.get_stencil('D3Q19', 'braunschweig'),
 
         s.get_stencil('D3Q27', 'premnath'),
+
+        s.get_stencil("D3Q27", "fakhari"),
     ]