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FEBio Manuals

3.15 Constraints Section

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Theory
User
Studio
Features
Febcode

FEBio Manuals

Theory
Theory
- Preface
- Chapter 1 - Introduction
  Chapter 1 - Introduction
  - 1.1 Overview of FEBio
  - 1.2 About this document
- Chapter 2 - Continuum Mechanics
  Chapter 2 - Continuum Mechanics
- Chapter 3 - The Nonlinear FE Method
  Chapter 3 - The Nonlinear FE Method
- Chapter 4 - Element Library
  Chapter 4 - Element Library
  - 4.1 Solid Elements
  - 4.2 Shell Elements
- Chapter 5 - Constitutive Models
  Chapter 5 - Constitutive Models
- Chapter 6 - Dynamics
  Chapter 6 - Dynamics
- Chapter 7 - Contact and Coupling
  Chapter 7 - Contact and Coupling
- Chapter 8 - Optimization
  Chapter 8 - Optimization
  - 8.1 The Objective Function
  - 8.2 The Levenberg-Marquardt Method
- Appendix A - Tensor Calculus
  Appendix A - Tensor Calculus
  - A.1 Second-Order Tensors
  - A.2 Higher Order Tensors
User
User
- Preface
- Chapter 1 - Introduction
  Chapter 1 - Introduction
- Chapter 2 - Running FEBio
  Chapter 2 - Running FEBio
- Chapter 3 - Free Format Input
  Chapter 3 - Free Format Input
- Chapter 4 - Multi-Step Analysis
  Chapter 4 - Multi-Step Analysis
  - 4.1 The Step Section
  - 4.2 An Example
- Chapter 5 - Restart Input file
  Chapter 5 - Restart Input file
- Chapter 6 - Parameter Optimization
  Chapter 6 - Parameter Optimization
- Chapter 7 - Configuration File
  Chapter 7 - Configuration File
  - 7.1 Overview
  - 7.2 Configuring Linear Solvers
- Chapter 8 - FEBio Plugins
  Chapter 8 - FEBio Plugins
  - 8.1 **Using Plugins**
  - 8.2 Error Messages
- Chapter 9 - Troubleshooting
  Chapter 9 - Troubleshooting
- Appendix A - Heterogeneous model parameters
  Appendix A - Heterogeneous model parameters
  - A.1 Math parameters
  - A.2 Mapped parameters
- Appendix B - Referencing Parameters
  Appendix B - Referencing Parameters
  - B.1 Referencing Parameters
- Appendix C - Math Expression
  Appendix C - Math Expression
  - C.1 Functions
  - C.2 Constants
- Appendix D - FEBio Binary Database Specification
  Appendix D - FEBio Binary Database Specification
- Appendix E - FEBio Output
  Appendix E - FEBio Output
  - E.1 Plotfile Variables
  - E.2 Logfile Variables
Studio
Studio
- Preface
- Chapter 1 - Introduction
  Chapter 1 - Introduction
  - 1.1 Overview of FEBioStudio
  - 1.2 About this document
- Chapter 2 - Getting Started
  Chapter 2 - Getting Started
- Chapter 3 - The FEBio Studio Environment
  Chapter 3 - The FEBio Studio Environment
- Chapter 4 - Creating, Loading, and Saving Models
  Chapter 4 - Creating, Loading, and Saving Models
- Chapter 5 - Creating and Editing Geometry
  Chapter 5 - Creating and Editing Geometry
- Chapter 6 - Generating and Editing Mesh Data
  Chapter 6 - Generating and Editing Mesh Data
- Chapter 7 - Materials
  Chapter 7 - Materials
- Chapter 8 - Boundary Conditions and Loads
  Chapter 8 - Boundary Conditions and Loads
- Chapter 9 - Contact and Constraints
  Chapter 9 - Contact and Constraints
  - 9.1 Contact
  - 9.2 Nonlinear constraints
- Chapter 10 - Rigid Bodies
  Chapter 10 - Rigid Bodies
- Chapter 11 - Defining Analysis Steps
  Chapter 11 - Defining Analysis Steps
  - 11.1 The Initial Step
  - 11.2 Adding an Analysis Step
- Chapter 12 - Configuring Output
  Chapter 12 - Configuring Output
  - 12.1 FEBio Logfile
  - 12.2 FEBio Plotfile
- Chapter 13 - Running FEBio from FEBioStudio
  Chapter 13 - Running FEBio from FEBioStudio
- Chapter 14 - The Post Environment
  Chapter 14 - The Post Environment
- Chapter 15 - Saving Graphics
  Chapter 15 - Saving Graphics
- Chapter 16 - The Post Panel
  Chapter 16 - The Post Panel
- Chapter 17 - Post Processing
  Chapter 17 - Post Processing
- Chapter 18 - Visualizing 3D Image Data
  Chapter 18 - Visualizing 3D Image Data
- Chapter 19 - Using Python in FEBio Studio
  Chapter 19 - Using Python in FEBio Studio
  - 19.1 The Embedded Python Interpreter
  - 19.2 The External Python Module
- Chapter 20 - Using and Creating FEBio Plugins
  Chapter 20 - Using and Creating FEBio Plugins
  - 20.1 The Plugin Repository
  - 20.2 Creating FEBio Plugins
- Appendix A - Mesh Import Formats
  Appendix A - Mesh Import Formats
  - A.1 FEBio
  - A.2 NIKE3D
  - A.3 HyperMesh ASCII
  - A.4 ABAQUS
  - A.5 LSDYNA keyword
  - A.6 ANSYS
  - A.7 DXF
  - A.8 Hypersurface ASCII
  - A.9 GMsh
  - A.10 BYU
  - A.11 VTK
  - A.12 STEP
  - A.13 BREP
  - A.14 IDEAS
  - A.15 NASTRAN
  - A.16 MESH
  - A.17 TETGEN
  - A.18 RAW
  - A.19 COMSOL
  - A.20 PLY
- Appendix B - Standard Data Fields
  Appendix B - Standard Data Fields
  - B.1 Standard Data Fields
Features
Features
- Preface
- Modules
  Modules
  - solid
  - biphasic
  - solute
  - multiphasic
  - fluid
  - fluid-FSI
  - fluid-solutes
- Features
  Features
  - Analysis
    Analysis
    
    biphasic
    
    fluid
    
    fluid-FSI
    
    fluid-solutes
    
    multiphasic
    
    multiphasic-FSI
    
    solid
    
    solute
  - Boundary conditions
    Boundary conditions
    
    actual fluid pressure
    
    displacement script
    
    fluid coronary outflow
    
    fluid pressure
    
    fluid pressure
    
    fluid pressure
    
    fluid RC
    
    fluid RCR
    
    fluid RCR
    
    fluid resistance
    
    fluid resistance
    
    fluid rotational velocity
    
    linear constraint
    
    matching_osm_coef
    
    normal displacement
    
    prescribed concentration
    
    prescribed deformation
    
    prescribed deformation 2O
    
    prescribed displacement
    
    prescribed fluid dilatation
    
    prescribed fluid pressure
    
    prescribed fluid velocity
    
    prescribed rotation
    
    prescribed shell displacement
    
    prescribed shell fluid pressure
    
    rigid
    
    rigid deformation
    
    rigid_displacement
    
    rigid_euler_angles
    
    rigid_fixed
    
    rigid_rotation
    
    rigid_rotation_vector
    
    zero concentration
    
    zero displacement
    
    zero fluid dilatation
    
    zero fluid pressure
    
    zero fluid velocity
    
    zero rotation
    
    zero shell displacement
  - Beamdomain
    Beamdomain
    
    elastic-truss
    
    linear-beam
    
    linear-truss
  - Callback
    Callback
    
    probe
  - Class
    Class
    
    ambient_concentration
    
    box blur
    
    child_dof
    
    constrained levmar
    
    fiber-odf
    
    iterative blur
    
    levmar
    
    linear_constraint
    
    material test
    
    node
    
    nrrd
    
    parameter_sweep_param
    
    powell
    
    raw
    
    rigid_cable_point
    
    scan
  - Discretedomain
    Discretedomain
    
    deformable-spring
    
    deformable-spring2
    
    discrete
  - Discretematerial
    Discretematerial
    
    discrete composite
    
    experimental spring
    
    Hill
    
    linear spring
    
    nonlinear spring
    
    tension-only linear spring
    
    torsion spring
  - Eigensolver
    Eigensolver
    
    feast
  - Function1d
    Function1d
    
    const
    
    linear ramp
    
    math
    
    point
    
    scale
    
    step
  - Globaldata
    Globaldata
    
    solid_bound
    
    solute
  - Initial conditions
    Initial conditions
    
    displacement
    
    initial concentration
    
    initial fluid dilatation
    
    initial fluid pressure
    
    initial fluid pressure
    
    initial fluid velocity
    
    initial shell concentration
    
    initial shell fluid pressure
    
    initial_rigid_angular_velocity
    
    initial_rigid_velocity
    
    prestrain
    
    rigid kinematics
    
    shell velocity
    
    velocity
  - Linearsolver
    Linearsolver
    
    accelerate
    
    bicgstab
    
    bipn
    
    block
    
    boomeramg
    
    cg
    
    diagonal
    
    fgmres
    
    hypre_gmres
    
    hypre_pcg_amg
    
    ichol
    
    ilu0
    
    ilut
    
    LU
    
    mkl_dss
    
    pardiso
    
    pardiso_64
    
    pardiso-project
    
    schur
    
    skyline
    
    strategy
    
    superlu_mt
    
    test
  - Load
    Load
    
    axial force
    
    bearing load
    
    biphasic-FSI traction
    
    body force
    
    body force script
    
    centrifugal
    
    const
    
    fluid backflow stabilization
    
    fluid backflow stabilization
    
    fluid backflow stabilization
    
    fluid body force
    
    fluid centrifugal force
    
    fluid mixture viscous traction
    
    fluid moving frame
    
    fluid normal traction
    
    fluid normal velocity
    
    fluid pressure
    
    fluid tangential damping
    
    fluid tangential stabilization
    
    fluid tangential stabilization
    
    fluid tangential stabilization
    
    fluid velocity
    
    fluid viscous traction
    
    fluidflux
    
    fluid-FSI traction
    
    force
    
    ideal gas pressure
    
    mass damping
    
    moving frame
    
    multiphasic-FSI traction
    
    nodal fluidflux
    
    nodal_force
    
    nodal_load
    
    nodal_target_force
    
    non-const
    
    normal_traction
    
    pipette aspiration
    
    point
    
    pressure
    
    pressure Robin BC
    
    pressure script
    
    pressure_stabilization
    
    radial force
    
    rigid_axial_force
    
    rigid_cable
    
    rigid_follower_force
    
    rigid_follower_moment
    
    rigid_force
    
    rigid_moment
    
    sbm point source
    
    solute backflow stabilization
    
    solute backflow stabilization
    
    solute convective flow
    
    solute flux
    
    solute flux
    
    solute natural flux
    
    solute natural flux
    
    solute point source
    
    soluteflux
    
    surface attraction
    
    traction
    
    traction Robin BC
    
    traction script
  - Loadcontroller
    Loadcontroller
    
    load controller script
    
    loadcurve
    
    math
    
    math-interval
    
    PID
  - Mat3dsvaluator
    Mat3dsvaluator
    
    const
    
    map
  - Mat3dvaluator
    Mat3dvaluator
    
    angles
    
    const
    
    cylindrical
    
    local
    
    map
    
    polar
    
    spherical
    
    vector
  - Material
    Material
    
    2D fiber neo-Hookean
    
    2D trans iso Mooney-Rivlin
    
    2D trans iso Veronda-Westmann
    
    active fiber stress
    
    Arruda-Boyce
    
    Arruda-Boyce unconstrained
    
    biphasic
    
    biphasic-FSI
    
    biphasic-solute
    
    Carreau-Yasuda viscous solid
    
    Carter-Hayes
    
    Carter-Hayes (old)
    
    cell growth
    
    compressible Gent
    
    continuous fiber distribution
    
    continuous fiber distribution uncoupled
    
    coupled Mooney-Rivlin
    
    coupled trans-iso Mooney-Rivlin
    
    coupled trans-iso Veronda-Westmann
    
    coupled Veronda-Westmann
    
    cubic CLE
    
    damage fiber exp-linear
    
    damage fiber exponential
    
    damage fiber power
    
    damage Mooney-Rivlin
    
    damage neo-Hookean
    
    damage trans iso Mooney-Rivlin
    
    Donnan equilibrium
    
    EFD Donnan equilibrium
    
    EFD Mooney-Rivlin
    
    EFD neo-Hookean
    
    EFD neo-Hookean (new)
    
    EFD uncoupled
    
    EFD Veronda-Westmann
    
    elastic damage
    
    elastic material script
    
    elastic membrane
    
    ellipsoidal fiber distribution
    
    ellipsoidal fiber distribution (old)
    
    fiber neo-Hookean
    
    fiber-CDF
    
    fiber-CDF-uncoupled
    
    fiber-entropy-chain
    
    fiber-exp-linear
    
    fiber-exponential-power-law
    
    fiber-exponential-power-law-uncoupled
    
    fiber-exp-pow
    
    fiber-exp-pow sbm
    
    fiber-exp-pow-linear
    
    fiber-exp-pow-uncoupled
    
    fiber-Kiousis-uncoupled
    
    fiber-natural-NH
    
    fiber-NH
    
    fiber-NH-uncoupled
    
    fiberODF
    
    fiber-pow
    
    fiber-pow-linear
    
    fiber-pow-linear sbm
    
    fiber-pow-linear-uncoupled
    
    fluid
    
    fluid-FSI
    
    fluid-solutes
    
    Fung orthotropic
    
    Fung-ortho-compressible
    
    Gent
    
    HGO unconstrained
    
    HGO-coronary
    
    Holmes-Mow
    
    Holzapfel-Gasser-Ogden
    
    hyperelastic
    
    incomp neo-Hookean
    
    isotropic elastic
    
    isotropic Hencky
    
    isotropic Lee-Sacks
    
    kinematic growth
    
    linear truss
    
    linear-beam
    
    lung
    
    micro-material
    
    micro-material2O
    
    mindlin elastic
    
    Mooney-Rivlin
    
    Mooney-Rivlin AD
    
    Mooney-Rivlin von Mises Fibers
    
    multigeneration
    
    multiphasic
    
    multiphasic-FSI
    
    multiphasic-multigeneration
    
    muscle material
    
    natural neo-Hookean
    
    neo-Hookean
    
    neo-Hookean AD
    
    neo-Hookean transiso
    
    Newtonian viscous solid
    
    Newtonian viscous solid uncoupled
    
    Ogden
    
    Ogden unconstrained
    
    orthotropic CLE
    
    orthotropic elastic
    
    osmotic virial expansion
    
    perfect osmometer
    
    polynomial
    
    porous neo-Hookean
    
    prescribed fiber active contraction
    
    prescribed isotropic active contraction
    
    prescribed trans iso active contraction
    
    prescribed uniaxial active contraction
    
    prestrain elastic
    
    PRLig
    
    reactive fatigue
    
    reactive plastic damage
    
    reactive plasticity
    
    reactive viscoelastic
    
    reactive viscoelastic damage
    
    reactive viscoelastic fatigue
    
    remodeling solid
    
    rigid body
    
    scaled elastic
    
    scaled uncoupled
    
    Shenoy
    
    solid mixture
    
    solutes
    
    spherical fiber distribution
    
    spherical fiber distribution sbm
    
    St.Venant-Kirchhoff
    
    TC nonlinear orthotropic
    
    tendon material
    
    trace-free neo-Hookean
    
    trans iso Mooney-Rivlin
    
    trans iso MR-Estrada
    
    trans iso Veronda-Westmann
    
    trans-iso hyperelastic
    
    triphasic
    
    uncoupled active contraction
    
    uncoupled active fiber stress
    
    uncoupled elastic damage
    
    uncoupled fiber-entropy-chain
    
    uncoupled fiber-exp-linear
    
    uncoupled Holmes-Mow
    
    uncoupled hyperelastic
    
    uncoupled isotropic Lee-Sacks
    
    uncoupled prescribed fiber active contraction
    
    uncoupled prescribed isotropic active contraction
    
    uncoupled prescribed trans iso active contraction
    
    uncoupled prescribed uniaxial active contraction
    
    uncoupled prestrain elastic
    
    uncoupled reactive fatigue
    
    uncoupled reactive viscoelastic
    
    uncoupled solid mixture
    
    uncoupled trans-iso hyperelastic
    
    uncoupled viscoelastic
    
    uncoupled viscoelastic damage
    
    Veronda-Westmann
    
    viscoelastic
    
    viscoelastic damage
    
    von-Mises plasticity
    
    wrinkle Ogden
    
    Yeoh
  - Materialprop
    Materialprop
    
    active_contraction
    
    active-const-supply
    
    area growth
    
    Bingham
    
    Carreau
    
    Carreau-Yasuda
    
    CDF gamma
    
    CDF log-normal
    
    CDF quintic
    
    CDF Simo
    
    CDF step
    
    CDF user
    
    CDF Weibull
    
    circular
    
    concentration-independent
    
    constant reaction rate
    
    Cross
    
    DC Deshpande-Fleck
    
    DC Drucker shear stress
    
    DC Drucker-Prager
    
    DC max normal Lagrange strain
    
    DC max normal stress
    
    DC max shear stress
    
    DC octahedral natural strain
    
    DC octahedral shear strain
    
    DC Simo
    
    DC specific strain energy
    
    DC strain energy density
    
    DC von Mises stress
    
    diff-Albro-iso
    
    diff-const-iso
    
    diff-const-ortho
    
    diff-ref-iso
    
    ellipsoidal
    
    elliptical
    
    exp-sed reaction rate
    
    fiber growth
    
    fiber-CDF
    
    fiber-CDF-uncoupled
    
    fiber-entropy-chain
    
    fiber-exp-linear
    
    fiber-exp-pow
    
    fiber-exp-pow-linear
    
    fiber-exp-pow-uncoupled
    
    fiber-natural-NH
    
    fiber-NH
    
    fiber-NH-uncoupled
    
    fiber-pow
    
    fiber-pow-linear
    
    fiber-pow-linear-uncoupled
    
    fibers-2d-trapezoidal
    
    fibers-3d-fei
    
    fibers-3d-gauss
    
    fibers-3d-geodesic
    
    fibers-3d-gkt
    
    force-velocity-Estrada
    
    general growth
    
    generation
    
    Huiskes reaction rate
    
    Huiskes-supply
    
    ideal gas isentropic
    
    in-situ stretch
    
    linear
    
    log-nonlinear
    
    mass-action-forward
    
    mass-action-forward-effective
    
    mass-action-reversible
    
    mass-action-reversible-effective
    
    membrane constant reaction rate
    
    membrane ion channel reaction rate
    
    membrane voltage-gated reaction rate
    
    membrane-mass-action-forward
    
    membrane-mass-action-reversible
    
    Michaelis-Menten
    
    Newtonian fluid
    
    Nims reaction rate
    
    nonlinear
    
    osm-coef-const
    
    osm-coef-Manning
    
    perm-const-iso
    
    perm-exp-iso
    
    perm-Holmes-Mow
    
    perm-ref-iso
    
    perm-ref-ortho
    
    perm-ref-trans-iso
    
    PFC math
    
    PFC paper
    
    PFC user
    
    Powell-Eyring
    
    prestrain gradient
    
    Quemada
    
    recruitment exponential
    
    recruitment gamma
    
    recruitment log-normal
    
    recruitment polynomial
    
    recruitment power
    
    recruitment quintic
    
    recruitment user
    
    recruitment Weibull
    
    relaxation-Carreau
    
    relaxation-CSexp
    
    relaxation-CSexp-dist-user
    
    relaxation-exp-distortion
    
    relaxation-exp-dist-user
    
    relaxation-exponential
    
    relaxation-Fung
    
    relaxation-Malkin
    
    relaxation-Malkin-distortion
    
    relaxation-Malkin-dist-user
    
    relaxation-Park
    
    relaxation-Park-distortion
    
    relaxation-Park-dist-user
    
    relaxation-power
    
    relaxation-power-distortion
    
    relaxation-power-dist-user
    
    relaxation-Prony
    
    Ruberti reaction rate
    
    solid_bound
    
    solub-const
    
    solub-Manning
    
    solute
    
    solute-as-sbm reaction rate
    
    spherical
    
    Starling
    
    Starling
    
    structure-tensor
    
    supply-binding
    
    supply-const
    
    supply-Michaelis-Menten
    
    supply-synthesis-binding
    
    uncoupled active_contraction
    
    uncoupled fiber-entropy-chain
    
    uncoupled fiber-exp-linear
    
    volume growth
    
    von-Mises-2d
    
    von-Mises-3d
    
    von-Mises-3d-two-axisym
    
    vP
    
    vPe
    
    vPi
    
    vR
    
    vRe
    
    vRi
  - Meshadaptor
    Meshadaptor
    
    erosion
    
    fsi-volume-erosion
    
    hex_refine
    
    hex_refine2d
    
    mmg_remesh
    
    test_refine
    
    tet_refine
  - Meshadaptorcriterion
    Meshadaptorcriterion
    
    contact gap
    
    damage
    
    element data
    
    element_selection
    
    fluid shear stress
    
    math
    
    max_variable
    
    mean-ratio
    
    min-max filter
    
    relative error
    
    relative volume
    
    scaled Jacobian
    
    spring force
    
    spring stretch
    
    strain
    
    stress
    
    tet-quality
  - Meshdatagenerator
    Meshdatagenerator
    
    defgrad
    
    image map
    
    math
    
    parabolic map
    
    surface-to-surface map
    
    surface-to-surface vector
  - Newtonstrategy
    Newtonstrategy
    
    BFGS
    
    Broyden
    
    full Newton
    
    JFNK
    
    modified Newton
  - Nlconstraint
    Nlconstraint
    
    2O microfluc
    
    azimuth constraint
    
    discrete contact
    
    discrete contact2
    
    edge-to-surface contact potential
    
    edge-to-surface sliding contact
    
    fixed normal displacement
    
    frictionless fluid wall
    
    generic rigid joint
    
    in-situ stretch
    
    linear constraint
    
    node distance
    
    node-on-node
    
    normal fluid flow
    
    point
    
    prestrain
    
    rigid angular damper
    
    rigid contractile force
    
    rigid cylindrical joint
    
    rigid damper
    
    rigid joint
    
    rigid lock
    
    rigid planar joint
    
    rigid prismatic joint
    
    rigid revolute joint
    
    rigid spherical joint
    
    rigid spring
    
    rigid_wall
    
    slide-line
    
    symmetry plane
    
    tied-line
    
    uniform fluid flow
    
    volume
  - Scalarvaluator
    Scalarvaluator
    
    const
    
    image map
    
    map
    
    math
  - Script
    Script
    
    script
  - Shelldomain
    Shelldomain
    
    biphasic-shell
    
    biphasic-solute-shell
    
    elastic-shell
    
    elastic-shell-ans
    
    elastic-shell-eas
    
    elastic-shell-old
    
    multiphasic-shell
    
    rigid-shell
    
    rigid-shell-old
    
    three-field-shell
  - Soliddomain
    Soliddomain
    
    biphasic-FSI-3D
    
    biphasic-solid
    
    biphasic-solute-solid
    
    elastic-mm-solid
    
    elastic-mm-solid2O
    
    elastic-solid
    
    elastic-solid2O
    
    fluid-3D
    
    fluid-FSI-3D
    
    fluid-solutes-3D
    
    multiphasic-FSI-3D
    
    multiphasic-solid
    
    remodeling-solid
    
    rigid-solid
    
    solutes-3D
    
    sri-solid
    
    three-field-solid
    
    triphasic-solid
    
    udg-hex
    
    ut4-solid
  - Solver
    Solver
    
    biphasic
    
    CG-solid
    
    explicit-solid
    
    fluid
    
    fluid-FSI
    
    fluid-solutes
    
    multiphasic
    
    multiphasic-FSI
    
    solid
    
    solute
    
    solutes
  - Surfaceinteraction
    Surfaceinteraction
    
    contact potential
    
    mortar-sliding
    
    mortar-tied
    
    periodic boundary
    
    periodic boundary1O
    
    periodic boundary2O
    
    sliding2
    
    sliding-biphasic
    
    sliding-biphasic-mixed
    
    sliding-biphasic-solute
    
    sliding-elastic
    
    sliding-facet-on-facet
    
    sliding-multiphasic
    
    sliding-node-on-facet
    
    sticky
    
    surface constraint
    
    tied-biphasic
    
    tied-elastic
    
    tied-facet-on-facet
    
    tied-fluid
    
    tied-multiphasic
    
    tied-node-on-facet
  - Task
    Task
    
    diagnose
    
    jfnk tangent test
    
    optimize
    
    param_run
    
    parameter_sweep
    
    quick_restart_test
    
    rci_solve
    
    reset_test
    
    restart
    
    restart_test
    
    solve
    
    stiffness_test
    
    test
  - Timecontroller
    Timecontroller
    
    default
  - Vec3dvaluator
    Vec3dvaluator
    
    angles
    
    cylindrical
    
    local
    
    map
    
    math
    
    spherical
    
    user
    
    vector
- Output
  Output
  - Plot variables
  - Log variables
Febcode

3.15 Constraints Section¶

The Constraints section allows the user to enforce additional nonlinear constraints to the model.

3.14 Contact Section

3.16 Discrete Section

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