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ANSYS Polyflow
 
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ANSYS Polyflow
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ANSYS Polyflow software is the finite element CFD solver for complex non-Newtonian rheologies including viscoelastic flow.

The different direct-coupled solvers using the finite element technique ensure robust convergence to address the complex physics of flows encountered in polymer processing and glass forming. The ILU and iterative solvers provide more aggressive solution techniques for large simulations involving less complex flow physics.

Advanced techniques to deal with deforming mesh, complex motion of solid parts (intermeshing screws), and detection of contact between free surface and molds are available to accurately simulate the many different processes involved in these industries.

 

Product Features Include:

General Modeling Capabilities

  • 2-D planar, 2.5-D planar (includes third velocity component), 2-D axisymmetric, 2-D axisymmetric with swirl, 3-D flows, 3-D shell element and 2-D membrane (film casting)
  • Isothermal and nonisothermal
  • Steady-state, transient analysis or evolution analysis (continuation technique)
  • Generalized Newtonian flow, including yield stress fluid
  • Multimodes differential viscoelastic flow (2-D and 3-D, steady-state or transient, isothermal and non-isothermal)
  • Multimodes integral viscoelastic flow (2-D and 3-D shell, steady-state (2-D) or transient (3-D shell), isothermal and nonisothermal)
  • Heat transfer including natural conduction, forced or mixed convection, conjugate (solid/fluid) heat transfer, radiation, thermal conduction in moving solids, electrical heating
    • Discrete ordinates model for internal radiation
  • Free surfaces modeling using deforming mesh
    • Volume of fluid (VOF) for modeling single phase free surface flows with fixed mesh
  • Inverse problem for extrusion (die lip design)
  • Internal moving boundaries (interface)
  • Static and dynamic contact points
  • Porous media (Darcy's law)
  • Chemical species mixing and reaction
  • Volumetric sources of heat, mass, viscous heating, electrical potential, Joule effect, bubbling
  • Fluid–structure interaction (FSI)
  • Narayanaswamy thermal viscoelastic model for glass cooling (residual stress)
  • Simple thermomechanical stress analysis after cooling
  • Contact detection
    • Motion of solid parts
      • Prescribed
      • Calculated (equilibrium of forces)
  • Mesh superposition technique (overlapping mesh method)
  • Sliding mesh technique
  • Lagrangian trajectory calculation including statistical analysis
  • Conversion of system of units
  • Windows-style organizer
    • Online access to web services
    • Files chronology tracking system
  • User-defined templates
  • Optimization
    • Die geometry (die balancing)
    • Flow and geometric optimization with multiple objective functions
    • Interface to VisualDOC™ (third-party optimization software)
  • Expert system provides insight concerning:
    • Diagnostic for nonconvergence and possible remedies
    • Mass and energy conservation
    • Adding missing iterations if necessary
    • Rate of convergence
    • Immediate run stop if divergence occurs
    • Current memory requirement
    • Recommendation of techniques to reduce CPU time for further similar simulations
    • Recommendation of necessary modifications of case set-up to ease convergence
  • Blow molding and extrusion templates with limited capabilities for design users

Mesh Capabilities

  • Quadrilateral, triangular, hexahedral (brick), tetrahedral, prism (wedge), pyramid, mixed element meshes (hybrid meshes), triangular 3-D shell element, quadrilateral 3-D shell element
  • P mesh (group of 0-D, 1-D, 2-D or 3-D topological entities)
  • Nonconformal (non-matching) mesh interfaces allowed
  • Interpolation including constant, linear, linear discontinuous, quadratic, mini element, 2X2, 4X4
  • Import of meshes from GAMBIT, GeoMESH, FIGEN, POLYMESH, POLYM3D, I-DEAS® V12, PATRAN®, HyperMesh®
  • Dynamic solution-based adaptation including:
    • Conformal adaption on triangular and tetrahedral meshes
    • Hanging-node adaption and mesh embedding for all element types
    • Adaptive criteria based on:
      • Mold curvature
      • Free-surface curvature
      • Distance to mold
      • Local variation of quantity
      • Local mesh deformation
      • Maximum size specified in user-defined box
  • Automatic interpolation of solution after mesh refinement
  • Mesh manipulation tools (scaling, translation, rotation and merging)
  • Remeshing techniques (deforming mesh) including:
    • Efficient 2-D remeshing technique (SPINES)
    • Robust 2-D remeshing technique (Optimesh, Elastic, Lagrangian, Thompson)
    • Efficient 3-D remeshing technique (Optimesh, Streamwise)
    • Full 3-D method (Thompson, elasticity-based, Lagrangian)
    • 3-D shell Lagrangian remeshing method
  • Combination of meshes from different sources into a single file (polyfuse)
  • Online mesh information box

Numerical Method

  • Streamwise approximation for tensors (SAFT) method to accelerate 3-D viscoelastic simulations
  • Finite element method based on fully unstructured meshes
  • Fully coupled/segregated solvers with option to decouple temperature and/or coordinates
  • Direct solver based on geometrical decomposition
  • Algebraic multi-frontal solver
    • Secant solver
    • ILU solver
  • Iterative solver
  • Dynamic memory allocation
  • Single- and double-precision calculation
  • Newton–Raphson and Picard iteration scheme for viscosity
  • EVSS (elastic viscous split stress) and DEVSS formulations
  • Upwinding (SU), 4X4 SU
  • Time integration
    • Implicit Euler
    • Implicit Galerkin
  • Crank–Nicolson

Rheological Modeling

  • Generalized Newtonian laws including:
    • Newtonian (constant)
    • Bird–Carreau
    • Cross
    • Power
    • Carreau–Yasuda
    • Bingham
    • Herschell–Bulkley
    • Log–log
    • Modified Bingham
    • Modified Herschel–Bulkley
    • Modified cross law
  • Temperature dependence
    • No dependence
    • Mixed dependence (polynomial expression)
    • Arrhenius approximate (first-order)
    • Arrhenius
    • Arrhenius approximate shear stress (vertical/horizontal shift)
    • Arrhenius shear stress
    • Fulcher
    • WLF
    • WLF shear stress (vertical/horizontal shift)
  • Additional dependence via UDF
    • Residence time (polymer aging)
    • Coordinates
    • Velocities
    • Strain rate
    • Invariants of rate of deformation tensors
    • Pressure
    • Temperature
    • Species
    • User-defined quantities
  • Automatic fitting tool for viscometric and rheometric curves
    • Shear rate vs. shear viscosity
    • Loss and storage moduli vs. frequency
    • First- and second-normal difference vs. frequency
    • Elongational viscosity (constant elongation rate) vs. time
    • Stress vs. strain (constant elongation speed

Viscoelastic Models

  • Multi-mode differential viscoelastic models
    • Maxwell
    • Oldroyd–B
    • White–Metzer
    • Phan Thien–Tanner
    • Giesekus
    • FENE P
    • Pom-pom
    • Leonov
    • Simplified viscoelastic model for extrusion (PFLM)
  • Multi-mode integral viscoelastic models (2-D and 3-D shell):
    • Lodge–Maxwell
    • Doi–Edwards
    • KBKZ with Wagner and Papanastasiou–Scriven–Macosko damping function (reversible or irreversible)
  • Temperature dependence
    • No dependence
    • Arrhenius approximate (first-order)
    • Arrhenius
    • WLF

Boundary Conditions

  • Inlet velocity in terms of Cartesian or cylindrical-polar components, magnitude and direction, magnitude of normal/tangential components, or user-specified local coordinate components
  • Inlet velocity profile calculated as a pre-processor considering the mass or volumetric flow rate, slip coefficient and rheological behavior
  • Exit static pressure
  • Outflow, with specified flow rate weighting
  • Outflow (Vs = 0 and Fn = Cst)
  • Takeup force
  • Takeup velocity
  • Wall boundaries, with specification of:
    • Tangential wall velocity using Cartesian component form, rotation speed or local axis
    • Shear stress including slip conditions
    • Thermal boundary conditions using heat-flux, temperature or external convection, radiation (emissivity), mixed conditions or user-specified temperature profile
    • Rosseland correction
  • Moving boundaries (free surface and interface), with specification of:
    • Specified normal force
    • Specified normal velocity
    • Air drag force
    • Slipping along the interface between two fluids
    • Surface/interface tension
  • Symmetry, rotationally periodic and translationally periodic boundaries
  • Axis boundary conditions
  • Specified normal and/or tangential force in combination with normal and tangential velocity
  • Specified normal and/or tangential force in combination with normal and tangential displacement (FSI)
    • Vanishing velocity along the solid (FSI)
    • Partial slip along the solid (FSI)
    • Imposed nodal displacement (FSI)
    • Thermal interface between flowing and solid materials
    • Interface between Navier-Stokes and Darcy's law
    • Partial slip for laminar flow
      • Navier's law
      • Coulomb's friction (using UDF)
      • Threshold law
      • Asymptotic law
      • Arrhenius dependence with request to temperature
    • Partial slip (Navier's law) along moving parts (using the mesh superposition technique)
      • Contact detection
        • 2-D mechanical contact
        • 3-D mechanical contact
        • Heat transfer with the mold
        • Slip behavior along the contact wall (Navier's law)
        • FSI: stress calculation in the mold induced by parison contact
      • Periodic conditions
      • Transient conditions
      • Temperature programming for thermoforming
      • User-specified profile or map of boundary condition under CSV format
      • User-specified profile or map of initial condition under CSV format
      • Optimization of initial thickness map for blow molding application

Material Properties

  • Constant or variable fluid properties including temperature and composition dependence (data pair or piecewise polynomial input), including thermal conductivity, specific heat and density
  • Constant or variable solid properties including temperature and composition dependence (data pair or piecewise polynomial input), including thermal conductivity, specific heat and density
  • Use of database containing material properties for standard fluids and solids (user-modifiable)
  • Availability of standard units systems
  • Temperature-dependent heat capacity and thermal conductivity in solid regions
  • User-defined property inputs
  • Automatic fitting tool for material properties
  • Gravity
  • Inertia term
  • Viscous heating
  • Heat source
  • Temperature variation of the density (Boussinesq approximation)
  • Surface tension
  • Young modulus
  • Poisson coefficient
  • Linear dilation coefficient
  • Interface to CAMPUSTM data base
  • Crystallization models
  • Doufas–McHugh
  • Nakamura (via UDF)

Chemical Reaction & Combustion Modeling

  • Finite rate chemistry for N reactions with backward reactions using:
    • Arrhenius
    • User-defined function
  • User-defined access to reaction source/sink terms
  • Physical foaming model (PE)
  • Curing model

User-Defined Functions

  • Definition of custom physical properties
  • Customized boundary conditions and initial conditions
  • Creation of custom post-processing variables

Parallel Processing

  • Parallel processing on shared-memory systems on all supported platforms
  • Domain decomposition method, with grid partitioning tools using METIS

 

 

Structural Analysis
Analysis Types
Δ = Limited set of feature capabilities
+ = Additional product required

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ANSYS Polyflow
Brochure
 
ANSYS Plastic and Rubber Industry Brochure
 
ANSYS Capabilities
Chart
 
   
Blow molding of a water fountain canister. Coextrusion of a soft (green) and dense (grey) rubber for automotive profile.
Blow molding of a water fountain canister. Coextrusion of a soft (green) and dense (grey) rubber for automotive profile.
Thermoformed dashboard component. Parison programming and extrusion blow molding using shell elements.
Thermoformed dashboard component. Parison programming and extrusion blow molding using shell elements.
   

 

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