By Roland Glowinski, Patrick Le Tallec

ISBN-10: 0898712300

ISBN-13: 9780898712308

ISBN-10: 1613447485

ISBN-13: 9781613447482

A necessity for a deeper knowing of the convergence houses of augmented Lagrangian algorithms and in their courting to operator-splitting equipment resembling alternating-methods course and the advance of extra effective algorithms brought on the authors to jot down this booklet. the amount is orientated to purposes in continuum mechanics. This quantity bargains with the numerical simulation of the habit of continuing media through augmented Lagrangian and operator-splitting equipment (coupled to finite-element approximations). It starts off with an outline of the mechanical and mathematical frameworks of the thought of functions in addition to a normal research of the fundamental numerical equipment also used to check them. those principles are then utilized to precise sessions of mechanical difficulties.

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Extra resources for Augmented Lagrangian and Operator Splitting Methods in Nonlinear Mechanics

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2. Variational formulation. 7. 2) over R, assuming a( *, t ) in 8"' and taking into account the definition of the subgradient, we then obtain the following variational formulation for the 36 CHAPTER 2 quasistatic evolution problem in elastoviscoplasticity. e. in (0, t,); u(x, 0 ) = uo(x), a ( x , 0 ) = ao(x). 3. Existence result (incompressiblecase). 5) is rather natural. 5), we state without proof an existence result proved in Blanchard and Le Tallec [1986]. , I Y ( 7 ) = 0 if T E Sm(t ) , I ~ ( =T+a ) if not), we have the following theorem.

4. 12) ~n{au~v+uVu~Vv-pdivv}dx=(f,v) div u = 0, tlv~HA(0); ulr = u1Ir, with f an arbitrary element of H-'(R) = (HA(R))*. Indeed, considering f i n H-'(fl) and adding the term &101' to the functional J ( ) does not affect the validity of the two proofs above if we set - X = {w E HA(fl), div w = 0}, Y = {D E ( L 2 ( f l ) ) N x tr N (D) , = 0}, r ( w , D ) = I ] {aIv+w12+vlV(v+w)-D12}dx-(f,v+w). 12) are important to our discussion for two reasons. First, they naturally appear in the time-discretizationof the Navier-Stokes equations (the equations that model the evolution of a Newtonian viscous fluid flowing inside a given domain).

E. e. in fl x (0, t l ) ; 37 MECHANICAL PROBLEMS (vi) {i,g ) E w l , m ( o , t , ;L ~ Rx)Lm(rz)); (vii) {uo,ao}E v"* x ~ " ( 0 ) . 5) has a solution {u, a} in W I J ~ tO , ; ,v"*)x W1*2(0,t l ; XZ) with in L"(0, t , ; X"). 1. 6) is the theoretical background upon which the application of augmented Lagrangian techniques to elastoviscoplasticity is based (see Chap. 4). 6), the duality pairing (E,T) corresponds , E T dx. 2. 1 applies to linearly viscoelastic Maxwell models. More generally, it applies to the so-called Maxwell- Norton materials whose constitutive laws are given by - It can also be extended to plastically compressiblematerials simply by replacing with a in assumptions (iii) and (iv).

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Augmented Lagrangian and Operator Splitting Methods in Nonlinear Mechanics by Roland Glowinski, Patrick Le Tallec


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