Update chapter2/monolithic_navierstokes_crp0.py

Co-authored-by: Jørgen Schartum Dokken <dokken92@gmail.com>

Author: akarve1507

chapter2/monolithic_navierstokes_crp0.py

@@ -83,8 +83,7 @@ def parse_args():
 # --- parameters / RHS ---
 nu = fem.Constant(domain, PETSc.ScalarType(args.nu))
 eps_p = fem.Constant(domain, PETSc.ScalarType(args.eps_p))
-zero = fem.Constant(domain, PETSc.ScalarType(0.0))
-f_vec = ufl.as_vector((zero, zero))  # zero body force
+f_vec = fem.Constant(domain, np.zeros(mesh.geometry.dim, dtype=dolfinx.default_scalar_type))
 
 # --- Picard state (for convection) ---
 w = fem.Function(W)        # holds (u_k, p_k)