3.3.9. StaggeredSolver

StaggeredSolver splits the solution into two subproblems handled by configured sub-solvers with disjoint dof sets. It alternates solves for each subset within a cycle and can perform Newton iterations for sub-solvers of type Nonlinear.

3.3.9.1. Overview

Solver type: StaggeredSolver

  • Sub-solvers: two configured blocks (solver1, solver2) with names, types, and dofTypes defining their scope

  • Load control: shared loadFunc and optional loadCases applied via sub-solver constrainers

  • Termination: when reaching maxCycle

3.3.9.2. Parameters

3.3.9.2.1. Mandatory Parameters

Parameter

Description

type

Must be set to "StaggeredSolver"

solver1 / solver2

Sub-blocks describing each solver (see below)

3.3.9.2.2. Sub-Solver Block Parameters

Parameter

Description

name

Identifier used in logs

type

"Nonlinear" or other recognized type

dofTypes

List of dof names handled by this sub-solver

3.3.9.2.3. Optional Parameters

Parameter

Description

tol

Convergence tolerance for nonlinear sub-solvers (default: 1.0e-3)

iterMax

Max iterations per sub-solver (default: 10)

dtime

Time step for load function evaluation (default: 1.0)

maxCycle

Maximum cycles (default: unlimited)

maxLam

Maximum load factor (default: 1.0e20)

loadFunc

String expression in time (e.g., "t")

loadCases

List of named cases with sub-blocks defining loadFunc and nodeTable

3.3.9.3. Examples

  • Staggered coupling between displacement and phase-field dofs (conceptual)

3.3.9.4. See Also