TECHNICAL SPECIFICATION

NOGRID points 6.x release

General Modeling Capabilities

Dimension

• 2D planar
• 2.5D planar (with thickness distribution, includes third velocity component)
• 2.5D planar including moving or rotating parts or borders
• 3D
• 2D axis-symmetric
• 2D axis-symmetric with swirl
• Future 3D shell element
• Future 2D membrane (film casting)

 

Time Integration and Point Movement

• Steady-state analysis (EULER method)
• Transient analysis (EULER method or LAGRANGE method)
• Free surface flows and flows using moving parts are solved by using the Arbitrary Lagrangian-Eulerian (ALE) method if the EULER method is selected.

 

Momentum

• Generalized Newtonian flow, including yield stress fluid
• Viscoelastic flow (2D and 3D, steady-state or transient, isothermal and non-isothermal, additional models: VFT-Model, Power-Law-Model, Carreau-Model, WLF-Model, WLF-Carreau-Yasuda-Model, Johnson-Cook-Model, Bingham-Model and a lot of special combinations of these models, see Rheological Modeling)
• New Narayanaswamy thermal viscoelastic model for glass cooling (residual stress)

 

Energy

• Isothermal and non-isothermal
• Heat transfer including natural conduction, forced or mixed convection, conjugate (solid/fluid) heat transfer, radiation
• Thermal conduction in fluid and solid including moving parts
• Rosseland approximation for thermal radiation in fluid and solid
• Electrical heating in fluid and solid including moving parts
• Volumetric sources of heat
• Viscous heating
• P1-Radiation model of thermal radiation to compute the radiative heat transfer in a semitransparent medium
• CRG (Composite Radiosity and Gap) model of thermal radiation to compute the radiative heat transfer in a semitransparent medium
• New Hybrid-P1 model of thermal radiation (n-Band model) to compute the radiative heat transfer in a semitransparent medium

 

Species

• Chemical species transport and reaction
• Volumetric sources of electrical heating

 

Further Physics

• Linear elastic thermo-mechanical stress analysis
• Future Porous media (Darcy's law)
• Future Inverse problem for extrusion (die lip design)
• Fluid structure interaction (FSI)

 

Geometry

• Movement of parts within the fluid and movement of boundaries
• Move position along a curve or equation
• Move velocity (velocity can change in time and location)
• Move rotation (rotation speed can change in time and location)
• Move rotation and move velocity (part position can change due to rotation and prescribed velocity)
• Move rotation and move position (part position can change due to rotation and position curve)
• Part switch on/off feature (using the active list)

 

Material Properties and Rheological Modeling

• Constant or variable fluid properties including temperature and composition dependence including thermal conductivity, specific heat and density
• Constant or variable solid properties including temperature and composition dependence including thermal conductivity, specific heat and density
• Temperature dependent heat capacity and thermal conductivity in solid regions
• User defined property by curves and equations
• Gravity (also time dependent)
• Time dependent centrifugal volumetric forces
• Inertia term
• Viscous heating
• Heat source
• Temperature variation of the density (Boussinesq approximation)
• Surface tension
• Shear modulus
• Johnson-Cook model for viscoelastic materials
• Rheology
  - Generalized Newtonian laws
  - Bird-Carreau model
  - Power law model
  - WLF model
  - WLF-Carreau-Yasuda
  - Cross
  - Cross with WLF shift
  - Menges-Wortberg-Michaeli
  - VFT (Folger-Flulcher-Tamman)
  - User defined viscoelastic models
  - User defined viscoplastic models
  - User defined plastic models
  - Linear elastic models
  - Complete user defined models
  - New Narayanaswamy thermal viscoelastic model for glass cooling (residual stress)
  - New Herschel-Bulkley model
  - New Bingham model
  - New Bingham-Papanastasiou model

 

Boundary Conditions

• Various boundary condition types with respect to moving boundaries: slip/no slip, free surface, symmetry, external stress, heat transfer
• Inlet velocity in terms of Cartesian components, magnitude and direction, magnitude of normal/tangential components or user-specified local coordinate components
• Shear stress including slip conditions
• Thermal boundary conditions using heat-flux, temperature or external convection, radiation (emissivity), mixed conditions or user specified temperature profile
• Specified normal velocity
• Slipping along the interface between two fluids
• Surface/interface tension
• Symmetry and periodic boundaries
• 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)
• Thermal interface between flowing and solid materials
• Contact detection 2D and 3D
• Heat transfer in all entities including moving/rotational parts
• Slip behavior along the contact wall (Navier's law)
• FSI: stress calculation in moving/rotational parts induced by the fluid
• Periodic conditions
• Transient conditions
• User specified profile or map of boundary condition under CSV format
• Importing boundary conditions from previous computations
• Wetting angle (the user can specify a wetting angle for each material or at each wall)

 

Initial Conditions

• User specified profile or map of initial condition under CSV format
• Importing fluid geometry (for example a free surface) from a previous computation as initial condition

 

Chemical Reaction and Combustion Modeling

• Finite rate chemistry for N reactions with backward reactions using
• Arrhenius equation
• User defined curves and equations
• User defined access to reaction source/sink terms
• Physical foaming model (PE)

 

Point Cloud Organization

• Import geometry from IGES, STEP, STL, GAMBIT and any CAD system provide IGES, STEP or STL export
• Automatic point cloud generation
• Local point cloud refinement based on user specification
• Adaptive point cloud refinement criteria based on:
  - Geometry
  - Flow results (OCTREE Algorithm)
  - User specification
  - Time
• Can use with 6-nodes triangles in the case of 3-D
• Repairs meshed entities (triangles or edges) with wrong orientation which were generated in the NOGRID CAD system COMPASS® or any other CAD software which is able to generate NOGRIDs geometry file
• Gap detection algorithm in order to compute thin geometrical structures within a fluid
• New Smoothing Length Modifier, which expands an existing smoothing length to a minimum and maximum value depending on geometrical constraints.
• New Smoothing length is set depending on the geometry and on the thickness of the fluid (wall to wall distance, free surface to wall distance and free surface to free surface distance)

 

Numerical Methods

• General Finite Difference method based on fully unstructured nodes
• Fully coupled/segregated solvers
• Dynamic memory allocation
• Single and double-precision calculation
• second order treatment of free surface approximation

 

User defined Curves and Equations

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

 

Organization

• Future Mathematical optimization of the modeled geometry with various objective functions
• Graphical visualization of rate of convergence
• Shows current memory requirement
• Future Material data base new advanced examples database/guideline data base

 

Post Processing

• Integration of a data analysis and visualization application into the GUI.

 

Pre Processing

• See NOGRID COMPASS® feature list

 

Parallel Processing

• Parallel processing on shared memory systems on all supported platforms

 

Interface, Graphics, Post Processing and Reporting

• Reporting and monitoring of fluxes of mass, heat and chemical species
• Reporting and monitoring of momentum forces for rotating parts
• Computation and reporting of surface integrals and averages
• Computation and reporting of volume integrals and averages
• Calculation of gradients (vector and scalar) and derived quantities

 

Data Export

• EnSight, STEP, IGES, STL
• New VRML

 

Online Help and Documentation

• Complete hypertext-based documentation
• Getting started
• Users guide including theory and application
• Tutorial guide with model-specific examples
• Advanced example data base

 

Supported Hardware

• NOGRID points is supported in serial and parallel, Linux 32“bit and 64“bit and Windows 32“bit and 64“bit