Adapted codegen example file to changes in lbmpy

tests/lbm/codegen/SrtWithForceFieldModel.gen.py

 import sympy as sp
 from lbmpy.boundaries import NoSlip, UBB
-from lbmpy_walberla import Field, generateLatticeModelFiles, RefinementScaling
-from lbmpy.creationfunctions import createLatticeBoltzmannMethod
-from lbmpy_walberla.boundary import createBoundaryClass
+from lbmpy_walberla import Field, generate_lattice_model_files, RefinementScaling
+from lbmpy.creationfunctions import create_lb_method
+from lbmpy_walberla.boundary import create_boundary_class
 from pystencils_walberla.cmake_integration import codegen
+import pystencils as ps
 
 # ------------- Lattice Model ------------------------------
-forceField = Field.createGeneric('force', spatialDimensions=3, indexDimensions=1, layout='fzyx')
-force = [forceField(0), forceField(1), forceField(2)]
+force_field = ps.fields("force(3): [3D]", layout='fzyx')
 
 omega = sp.Symbol("omega")
 
 scaling = RefinementScaling()
-scaling.addStandardRelaxationRateScaling(omega)
-scaling.addForceScaling(forceField)
+scaling.add_standard_relaxation_rate_scaling(omega)
+scaling.add_force_scaling(force_field)
 
-generateLatticeModelFiles(className='SrtWithForceFieldModel',
-                          method='srt', stencil='D3Q19', forceModel='guo', force=force,
-                          relaxationRates=[omega], refinementScaling=scaling)
+generate_lattice_model_files(class_name='SrtWithForceFieldModel',
+                             method='srt', stencil='D3Q19', force_model='guo', force=force_field.center_vector,
+                             relaxation_rates=[omega], refinement_scaling=scaling)
 
 
 def genBoundary():
     boundary = UBB([0.05, 0, 0], dim=3, name="MyUBB")
-    method = createLatticeBoltzmannMethod(stencil='D3Q19', method='srt')
-    return createBoundaryClass(boundary, method)
+    method = create_lb_method(stencil='D3Q19', method='srt')
+    return create_boundary_class(boundary, method)
 
 def genNoSlip():
     boundary = NoSlip(name='MyNoSlip')
-    method = createLatticeBoltzmannMethod(stencil='D3Q19', method='srt')
-    return createBoundaryClass(boundary, method)
+    method = create_lb_method(stencil='D3Q19', method='srt')
+    return create_boundary_class(boundary, method)
 
 codegen.register(['MyUBB.h', 'MyUBB.cpp'], genBoundary)
 codegen.register(['MyNoSlip.h', 'MyNoSlip.cpp',], genNoSlip)