Technical Specification

Parent Category: Products
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 axissymmetric
 2D axissymmetric with swirl
 Future 3D shell element
 Future 2D membrane (film casting)
Time Integration and Point Movement
 Steadystate analysis (EULER method)
 Transient analysis (EULER method or LAGRANGE method)
 Free surface flows and flows using moving parts are solved by using the Arbitrary LagrangianEulerian (ALE) method if the EULER method is selected.
Momentum
 Generalized Newtonian flow, including yield stress fluid
 Viscoelastic flow (2D and 3D, steadystate or transient, isothermal and nonisothermal, additional models: VFTModel, PowerLawModel, CarreauModel, WLFModel, WLFCarreauYasudaModel, JohnsonCookModel, BinghamModel and a lot of special combinations of these models, see Rheological Modeling)
 Future Narayanaswamy thermal viscoelastic model for glass cooling (residual stress)
Energy
 Isothermal and nonisothermal
 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
 P1Radiation 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 HybridP1 model of thermal radiation (nBand 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 thermomechanical 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
 JohnsonCook model for viscoelastic materials
 Rheology
 Generalized Newtonian laws
 BirdCarreau model
 Power law model
 WLF model
 WLFCarreauYasuda
 Cross
 Cross with WLF shift
 MengesWortbergMichaeli
 VFT (FolgerFlulcherTamman)
 User defined viscoelastic models
 User defined viscoplastic models
 User defined plastic models
 Linear elastic models
 Complete user defined models
 Future Narayanaswamy thermal viscoelastic model for glass cooling (residual stress)
 New HerschelBulkley model
 New Bingham model
 New BinghamPapanastasiou 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 userspecified local coordinate components
 Shear stress including slip conditions
 Thermal boundary conditions using heatflux, 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 6nodes triangles in the case of 3D
 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 doubleprecision 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 hypertextbased documentation
 Getting started
 Users guide including theory and application
 Tutorial guide with modelspecific 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