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Multicomponent demo sub bcs for EquationBC #4695

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Multicomponent demo sub bcs for EquationBC #4695

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3 changes: 2 additions & 1 deletion demos/multicomponent/multicomponent.py.rst
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Expand Up @@ -449,7 +449,8 @@ unknowns and/or are nonlinear must be implemented with :class:`~.EquationBC` ins
# Boundary conditions on the barycentric velocity are enforced via EquationBC
bc_data = {inlet_1_id: rho_v_inflow_1_bc_func, inlet_2_id: rho_v_inflow_2_bc_func, outlet_id: rho_v_outflow_bc_func}
F_bc = sum(inner(v - rho_inv * flux, u) * ds(*subdomain) for subdomain, flux in bc_data.items())
v_bc = EquationBC(F_bc == 0, solution, (*inlet_1_id, *inlet_2_id, *outlet_id), V=Z_h.sub(2))
sub_bcs = [DirichletBC(Z_h.sub(2), 0, [(1,2), (2,3), (3,4), (4,5), (5,6), (1,6)])] # bc on the boundary of the boundary
v_bc = EquationBC(F_bc == 0, solution, (*inlet_1_id, *inlet_2_id, *outlet_id), V=Z_h.sub(2), bcs=sub_bcs)
Comment on lines +452 to +453
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@pbrubeck pbrubeck Nov 3, 2025 •
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We could definetly explain what the tuple syntax means here, as it is a very under-used feature. Also it would be more clear if these tuples were constructed programatically using the wall, inlet and outlet ids.


# The boundary conditions on the fluxes and barycentric velocity
# Note that BCs on H(div) spaces only apply to the normal component
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