mirror of
https://github.com/JuliaFEM/JuliaFEM.jl.git
synced 2026-09-20 10:08:31 +00:00
Jukka Aho
84 lines
2.3 KiB
Julia
84 lines
2.3 KiB
Julia
# This file is a part of JuliaFEM.
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# License is MIT: see https://github.com/JuliaFEM/JuliaFEM.jl/blob/master/LICENSE.md
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abstract Equation
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"""
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Integration point
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xi :: Array{Float64, 1}
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(dimensionless) coordinates of integration point
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weight :: Float64
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Integration weight
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attributes :: Dict{Any, Any}
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This is used to save internal variables of IP needed e.g. for incremental
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material models.
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"""
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type IntegrationPoint
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xi :: Array{Float64, 1}
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weight :: Float64
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attributes :: Dict{Any, Any}
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end
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IntegrationPoint(xi, weight) = IntegrationPoint(xi, weight, Dict{ASCIIString, Any}())
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has_lhs(eq::Equation) = false
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get_lhs(eq::Equation, xi) = nothing
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has_rhs(eq::Equation) = false
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get_rhs(eq::Equation, xi) = nothing
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get_element(eq::Equation) = eq.element
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get_integration_points(eq::Equation) = eq.integration_points
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# couple convenient functions -- could make weak form definition easier
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get_connectivity(eq::Equation) = get_connectivity(get_element(eq))
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get_basis(eq::Equation, ip::IntegrationPoint) = get_basis(get_element(eq), ip.xi)
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get_dbasisdx(eq::Equation, ip::IntegrationPoint) = get_dbasisdx(get_element(eq), ip.xi)
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interpolate(eq::Equation, field::Union(ASCIIString, Symbol), ip::IntegrationPoint) = interpolate(get_element(el), field, ip.xi)
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integrate_lhs(eq::Equation) = has_lhs(eq) ? integrate(eq, get_lhs) : nothing
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integrate_rhs(eq::Equation) = has_rhs(eq) ? integrate(eq, get_rhs) : nothing
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"""
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Return determinant of Jacobian for numerical integration.
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"""
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function get_detJ(eq::Equation, ip::IntegrationPoint)
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el = get_element(eq)
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get_detJ(el, ip)
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end
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function get_detJ(el::Element, ip::IntegrationPoint)
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J = get_detJ(el, ip.xi)
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end
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function get_detJ(el::Element, xi::Vector)
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J = get_Jacobian(el, xi)
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s = size(J)
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return s[1] == s[2] ? det(J) : norm(J)
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end
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"""
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Integrate f over element
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Parameters
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----------
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eq::Equation
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f::Function
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Function to integrate
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"""
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function integrate(eq::Equation, f::Function)
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target = []
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for ip in get_integration_points(eq)
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push!(target, ip.weight*f(eq, ip)*get_detJ(eq, ip))
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end
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return sum(target)
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end
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function get_global_dofs(eq::Equation)
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eq.global_dofs
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end
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function set_global_dofs!(eq::Equation, dofs)
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eq.global_dofs = dofs
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end
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# Equations for heat problems
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include("heat_equations.jl")
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