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Support multi-physics in injectivity-preserving line search #149

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Merged
jmartfrut merged 1 commit into from
Apr 9, 2026
Merged

Support multi-physics in injectivity-preserving line search #149

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28 changes: 18 additions & 10 deletions src/Solvers/LineSearches.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -63,16 +63,17 @@ struct Injectivity_Preserving_LS{A} <: AbstractLineSearch
ρ::Float64
c::Float64
β::CellField
maskphys::Int64
caches::A
function Injectivity_Preserving_LS(α::CellState, U, V; maxiter::Int64=50, αmin::Float64=1e-16, ρ::Float64=0.5, c::Float64=0.95, β::Float64=0.95)
function Injectivity_Preserving_LS(α::CellState, U, V; maxiter::Int64=50, αmin::Float64=1e-16, ρ::Float64=0.5, c::Float64=0.95, β::Float64=0.95, maskphys::Int64=0)
caches = (U, V)
new{typeof(caches)}(α, maxiter, αmin, ρ, c, CellField(β, α.points.trian), caches)
new{typeof(caches)}(α, maxiter, αmin, ρ, c, CellField(β, α.points.trian), maskphys, caches)
end


function (obj::Injectivity_Preserving_LS)(x::AbstractVector, dx::AbstractVector, b::AbstractVector, op::NonlinearOperator)

_, maxiter, αmin, ρ, c= obj.α, obj.maxiter, obj.αmin, obj.ρ, obj.c
_, maxiter, αmin, ρ, c = obj.α, obj.maxiter, obj.αmin, obj.ρ, obj.c
#update cell state
U, V = obj.caches
xh = FEFunction(U, x)
Expand All @@ -84,7 +85,7 @@ struct Injectivity_Preserving_LS{A} <: AbstractLineSearch
while α > αmin && m < maxiter
residual!(b, op, x + α * dx)
R = b' * dx
if R <= c * R₀
if abs(R) <= abs(c * R₀)
break
end
α *= ρ
Expand All @@ -96,19 +97,26 @@ struct Injectivity_Preserving_LS{A} <: AbstractLineSearch
end

function InjectivityCheck(α, ∇u, ∇du, β)
ε = 1e-6
# ε = 1e-6
F = ∇u + one(∇u)
J = det(F)
H = J * inv(F)'
# if det(F+∇du) < 0.2
# @show det(F), det(F+∇du)
# end
return true, min(β*abs(( -J) / (det(∇du) + tr(H' * ∇du) )), 1.0)
return true, min(β * abs((-J) / (det(∇du) + tr(H' * ∇du))), 1.0)

end


function update_cellstate!(obj::Injectivity_Preserving_LS, xh, dxh)
update_state!(InjectivityCheck, obj.α, ∇(xh)', ∇(dxh)', obj.β)
uh = obj.maskphys == 0 ? xh : xh[obj.maskphys]
duh = obj.maskphys == 0 ? dxh : dxh[obj.maskphys]
update_state!(InjectivityCheck, obj.α, ∇(uh)', ∇(duh)', obj.β)
return minimum(minimum((obj.α.values)))
end
end


# function update_cellstate!(obj::Injectivity_Preserving_LS, xh, dxh)
# update_state!(InjectivityCheck, obj.α, ∇(xh)', ∇(dxh)', obj.β)
# return minimum(minimum((obj.α.values)))
# end
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