An accelerated Newton method for nonlinear materials in structure mechanics and fluid mechanics.

*(English)*Zbl 1432.76166
Radu, Florin Adrian (ed.) et al., Numerical mathematics and advanced applications. ENUMATH 2017. Selected papers based on the presentations at the European conference, Bergen, Norway, September 25–29, 2017. Cham: Springer. Lect. Notes Comput. Sci. Eng. 126, 345-353 (2018).

Summary: We analyze a modified Newton method that was first introduced in [S. Mandal et al., Lect. Notes Comput. Sci. Eng. 112, 481–490 (2016; Zbl 1387.76058)]. The basic idea of the acceleration technique is to split the Jacobian \(A'(x)\) into a “good part” \(A'_1(x)\) and into a troublesome part \(A'_2(x)\). This second part is adaptively damped if the convergence rate is bad and fully taken into account close to the solution, such that the solver is a blend between a Picard iteration and the full Newton scheme. We will provide first steps in the analysis of this technique and discuss the effects that accelerate the convergence.

For the entire collection see [Zbl 1411.65009].

For the entire collection see [Zbl 1411.65009].

##### MSC:

76M10 | Finite element methods applied to problems in fluid mechanics |

74S05 | Finite element methods applied to problems in solid mechanics |

65H10 | Numerical computation of solutions to systems of equations |

74R10 | Brittle fracture |

65N30 | Finite element, Rayleigh-Ritz and Galerkin methods for boundary value problems involving PDEs |

76A05 | Non-Newtonian fluids |

65N22 | Numerical solution of discretized equations for boundary value problems involving PDEs |

76A10 | Viscoelastic fluids |