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refactor(dofs): remove unused mixed.jl placeholder module

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Drop stale mixed-field scaffold superseded by @DOFSet multifield specs.
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Jukka Aho
2026-05-09 16:47:53 +03:00
parent 77fd030124
commit fe4fff86f0
1 changed files with 0 additions and 95 deletions
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# This file is a part of JuliaFEM.
# License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE
"""
Mixed DOF Types - Entity-Based
Implementation of mixed/coupled DOF systems where multiple DOF types
coexist on the same element.
# Core Type
- `MixedDOF{DOFs}`: Composition of multiple entity-based DOF types
# Use Cases
**Stokes (velocity + pressure):**
```julia
MixedDOF{(
DOF{Vec{2}, Vertex{Triangle{3}}}, # Velocity at vertices
DOF{Float64, Vertex{Triangle{3}}} # Pressure at vertices
)}
```
**3-Field Formulation (u + p + J):**
```julia
MixedDOF{(
DOF{Vec{3}, Vertex{Tetrahedron{4}}}, # Displacement at vertices
DOF{Float64, Vertex{Tetrahedron{4}}}, # Pressure at vertices
DOF{Float64, Edge{Tetrahedron{4}}} # Volumetric DOF on edges
)}
```
**Mixed Interpolation (Taylor-Hood):**
```julia
MixedDOF{(
DOF{Vec{2}, Vertex{Triangle{6}}}, # Quadratic velocity
DOF{Float64, Vertex{Triangle{3}}} # Linear pressure (different topology!)
)}
```
# DOF Ordering
Mixed DOFs are concatenated in order:
```julia
MixedDOF{(DOF{Vec{2}, Vertex{Triangle{3}}}, DOF{Float64, Vertex{Triangle{3}}})}
# For Triangle{3}:
# Field 1: [u1x, u1y, u2x, u2y, u3x, u3y] (6 DOFs from 2×3 vertices)
# Field 2: [p1, p2, p3] (3 DOFs from 1×3 vertices)
# Total: [u1x, u1y, u2x, u2y, u3x, u3y, p1, p2, p3] (9 DOFs)
```
"""
# MixedDOF is already defined in api.jl, this file adds helper functions
# ============================================================================
# Helper Functions
# ============================================================================
"""
Check if DOF type is mixed.
"""
is_mixed(::Type{<:MixedDOF}) = true
is_mixed(::Type{<:DOF}) = false
"""
Get the tuple of constituent DOF types.
"""
function get_dof_types(::Type{MixedDOF{DOFs}}) where {DOFs}
return DOFs.parameters
end
"""
Get number of fields in mixed system.
"""
function num_fields(::Type{MixedDOF{DOFs}}) where {DOFs}
return length(DOFs.parameters)
end
"""
Get DOF type for specific field (1-indexed).
"""
function get_field_dof_type(::Type{MixedDOF{DOFs}}, field_idx::Int) where {DOFs}
return DOFs.parameters[field_idx]
end
# ============================================================================
# Display
# ============================================================================
function Base.show(io::IO, ::Type{MixedDOF{DOFs}}) where {DOFs}
dof_types = [string(T) for T in DOFs.parameters]
print(io, "MixedDOF{(", join(dof_types, ", "), ")}")
end