Merge branch 'FixFreeSlip' into 'master'

[BugFix] FreeSlip

See merge request walberla/walberla!649

python/lbmpy_walberla/additional_data_handler.py

@@ -76,7 +76,7 @@ class FreeSlipAdditionalDataHandler(AdditionalDataHandler):
                           f"   element.wnx = {inv_offset[0]};",
                           f"   element.wny = {inv_offset[1]};",
                           f"   element.wnz = {inv_offset[2]};",
-                          f"   ref_dir = {direction};",
+                          f"   ref_dir = {self._walberla_stencil.index(inv_offset)};",
                           "}"]
         elif self._dim == 2:
             init_list += ["// concave corner (neighbors are non-fluid)",
@@ -84,7 +84,7 @@ class FreeSlipAdditionalDataHandler(AdditionalDataHandler):
                           "{",
                           f"   element.wnx = {inv_offset[0]};",
                           f"   element.wny = {inv_offset[1]};",
-                          f"   ref_dir = {direction};",
+                          f"   ref_dir = {self._walberla_stencil.index(inv_offset)};",
                           "}"]
         init_list.append("element.ref_dir = ref_dir;")
 

tests/lbm/codegen/GeneratedFreeSlip.py

@@ -14,7 +14,7 @@ import sympy as sp
 
 with CodeGeneration() as ctx:
     data_type = "float64" if ctx.double_accuracy else "float32"
-    stencil = LBStencil(Stencil.D3Q19)
+    stencil = LBStencil(Stencil.D3Q27)
 
     pdfs, pdfs_tmp = fields(f"pdfs({stencil.Q}), pdfs_tmp({stencil.Q}): {data_type}[{stencil.D}D]",
                             layout='fzyx')