Solution Attribute Nodes

	About Solver Commands in the COMSOL Multiphysics Programming Reference Manual.

Table 20-6: Solution Attribute Nodes
Icon	Name	Description
	Adaptive Mesh Refinement (Time-Dependent Adaptation)	Handles adaptive mesh refinement together with a Stationary, Eigenvalue, or Time-Dependent solver. The adaptive mesh refinement creates multiple meshes for segments of a time-dependent simulation. Also see The Adaptive Solver Algorithms and Error Estimation.
	Advanced	Advanced general solver parameters.
	AMG Coarse Solver	Administrate coarse grid solvers when using an Auxiliary-Space AMG solver.
	AMG Postsmoother	Handles settings for the AMG postsmoother (when using Auxiliary-Space AMG).
	AMG Presmoother	Handles settings for the AMG presmoother (when using Auxiliary-Space AMG).
	Automatic Remeshing	Adds automatic remeshing parameters. The remeshing occurs when the mesh quality falls below a specified value. Add it to a Time-Dependent solver.
	Auxiliary-Space AMG	Handles parameters for linear system solvers/preconditioners that use the auxiliary-space AMG solver. Add it to Iterative, Krylov Preconditioner, or Coarse Solver attributes.
	Auxiliary-Space Maxwell (AMS)	Handles parameters for linear system solvers/preconditioners that use the auxiliary-space Maxwell solver (AMS). Add it to Iterative, Krylov Preconditioner, or Coarse Solver attributes.
	Block Navier–Stokes	Adds an efficient preconditioner for the incompressible Navier-Stokes equations in the transient regime.
	Coarse Solver	Administrate coarse grid solvers when using a Multigrid or Domain Decomposition (Schwarz) solver.
	Control Field	Handles settings for field variables that are acting as control variables. Control variables have a special status when using the Sensitivity or Optimization solver. Used together with the Dependent Variables operation node.
	Control State	Handles settings for state variables that are acting as control variables. Control (state) variables have a special status when using the Sensitivity or the Optimization solver. Used together with the Dependent Variables operation node.
	Direct	Handles settings for a direct linear solver.
	Direct Preconditioner	Handles settings for a direct linear solver used as a preconditioner.
	Domain Decomposition (Schur)	Used to set up an additive or multiplicative Schur domain decomposition solver. Add it to an Iterative solver or a Coarse Solver attribute. Also see The Domain Decomposition Solvers.
	Domain Decomposition (Schwarz)	Used to set up an additive, multiplicative, hybrid, or symmetric Schwarz overlapping domain decomposition solver. Add it to an Iterative solver or a Coarse Solver attribute. Also see The Domain Decomposition Solvers.
	Domain Solver	Administrate domain solvers when using a Domain Decomposition (Schwarz) or Domain Decomposition (Schur) solver.
	Eigenvalue Parametric	Used for an eigenvalue parametric study. This attribute can be used together with the Eigenvalue Solver.
	Error Estimation	Display information about the functional for goal-oriented error estimation.
	Domain Solver	Handles settings for the domain solver (when using Domain Decomposition).
	Field	Handles settings for field variables, including settings for storing the field in the output or not. Each field variable needs a separate Field node. This attribute is used with the Dependent Variables operation node.
	Fully Coupled	Uses a damped version of Newton’s method or a double dogleg method that handles parameters for a fully coupled solution approach. It can be used with the Stationary or Time-Dependent solvers. Also see The Fully Coupled Attribute and the Double Dogleg Method.
	Hierarchical LU	Handles hierarchical LU factorization for the BEM solver.
	Incomplete LU	Handles parameters for linear system solvers/preconditioners that use incomplete LU factorization. Add it to Iterative, Krylov Preconditioner, or Coarse Solver attributes.
	Iterative	Handles settings for an iterative linear solver or preconditioner. Also see The Iterative Solvers.
	Jacobi	Handles settings for the Jacobi (or diagonal scaling) method. Add it to Iterative, Krylov Preconditioner, Presmoother, Postsmoother, or Coarse Solver attributes.
	Krylov Preconditioner	Handles settings for the Krylov-type linear solver or preconditioner. Add it to Iterative, Presmoother, Postsmoother, Coarse Solver, Schur Solver, or Schur Source Solver attributes.
	Localized Schur	Handles settings for the localized Schur solver. Add it to Domain Decomposition>Schur Solver nodes and to their Krylov Preconditioner subnodes.
	Lower Limit	Parameters for imposing restrictions on degrees of freedom. Add it to a Segregated attribute.
	Lumped Step	Available with a Segregated attribute node. This step is intended for speeding up the computation of any L2-projections, stemming from the identity operator, appearing as a single-physics interface within a multiphysics problem.
	Multigrid	Handles settings for a multigrid linear solver or preconditioner. Add it to Iterative, Krylov Preconditioner, Presmoother, Postsmoother, or Coarse Solver attributes. Also see The Multigrid Solvers.
	Parametric	Handles settings for parameter stepping. This attribute can be used together with the Stationary Solver. Also see The Parametric Solver Algorithm.
	Postsmoother	Handles settings for the postsmoother (when using Multigrid).
	Presmoother	Handles settings for the presmoother (when using Multigrid).
	Pressure Solver	Administrate solvers for the pressure when using Block Navier-Stokes.
	Previous Solution	An optional attribute node of the Parametric attribute node. It handles field variables that have to be accessed at a previous parameter value or time.
	SCGS	Handles the SCGS (symmetrically coupled Gauss-Seidel) solver, which is useful as a preconditioner for solving the Navier-Stokes equations and similar fluid-flow problems. Also see The SCGS Solver.
	Schur Solver	Handles settings for the Schur solver when using Domain Decomposition (Schur).
	Schur Source Solver	Handles settings for the Schur solver when using Domain Decomposition (Schur), when an absorbing boundary condition is used.
	Segregated	Handles parameters for a segregated solution approach. This attribute makes it possible to split the solution process into substeps. Each substep uses a damped version of Newton’s method. Add it to Stationary and Time Dependent solvers. Also see The Segregated Solver.
	Segregated Step	Handles settings for one substep of a segregated iteration. This attribute uses a damped version of Newton’s method and can be used together with a Segregated attribute node.
	Sensitivity	Sensitivity parameters. Also see The Sensitivity Analysis Algorithm.
	SOR	Handles settings for the SOR (successive over-relaxation) iterative method. Add it to Iterative, Krylov Preconditioner, Presmoother, Postsmoother, or Coarse Solver attributes. Also see The SOR Method.
	SOR Gauge	Handles settings for an SOR Gauge-type linear solver or preconditioner. Also see The SSOR Gauge, SOR Gauge, and SORU Gauge Algorithms.
	SOR Line	Handles settings for an SOR Line linear solver or preconditioner. Also see The SOR Line Algorithm.
	SOR Vector	Handles settings for an SOR Vector-type linear solver or preconditioner. Also see The SOR Vector Algorithm.
	SCGS	Handles settings for the SAI (sparse approximate inverse) preconditioner, pre- and post-smoother, or coarse solver. Add it to Iterative, Iterative>Krylov Preconditioner, Multigrid>Presmoother and Postsmoother, and Domain Decomposition>Coarse Solver and Domain Solver nodes.
	Sparse Localized Schur	Handles settings for the sparse localized Schur solver. Add it to Domain Decomposition>Schur Solver nodes (it is the default Schur solver).
	State	Handles settings for state variables. A state is composed of a set of ODE variables. Used together with the Dependent Variables operation node.
	Stationary Acceleration	Accelerates the solution process for nonlinear problems with a time-periodic stationary solution.
	Stop Condition	An attribute that stops parameter stepping or time stepping when a specified condition is fulfilled.
	Time Parametric	Handles settings for parameter stepping. This attribute can be used together with the Time-Dependent Solver.
	Vanka	Handles settings for a Vanka linear solver or preconditioner. Also see The Vanka Algorithm.
	Velocity Solver	Administrate solvers for the velocity when using Block Navier-Stokes.