By Shiva P.

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We note that we require dim η w = dim(ηη s − η gs ). 21) C∈ηηgs for all A ∈ η w and B ∈ η s − η gs . 16) is solved for the unknown solution vector U. 8). 14). Given the initial guess U0 , the following iteration is performed for i = 0, 1, . . , (imax − 1): Ki ΔUi = −Ri , 4 See Notes 2 and 3 in this chapter. 26) i and the i + 1 st solution iterate is updated as Ui+1 = Ui + ΔUi . 22) continue until riA = 0 in an approximate sense. In the above, Ki is the consistent tangent matrix evaluated at the ith solution iterate.

A so-called convective form of the ALE equations may be obtained from the conservative form as follows. 221) where we also assume that the density ρ is constant. 221), we obtain ρ ∂u ˆ · ∇ u − f − ∇ · σ = 0. 223) This is the convective form of the linear-momentum balance equation of incompressible ﬂows in the ALE description. 220). While in the fully continuous setting the conservative and convective forms of the ﬂuid mechanics equations are equivalent, this is not always the case in the discrete setting.

The theory of hyperelasticity assumes the existence of a stored elastic-energy density per unit volume of the undeformed conﬁguration, ϕ, expressed as a function of the strain as ϕ = ϕ (E) . 126) The second Piola–Kirchhoﬀ stress S is obtained by diﬀerentiating ϕ with respect to E as S (E) = ∂ϕ (E) . 96). The tensor of elastic moduli, which plays an important role in the linearization of the structural mechanics equations, is deﬁned as the second derivative of ϕ with respect to E, namely, ¼ (E) = ∂2 ϕ (E) .