ANSWER^®

General Features:

• ANSWER^® is highly modular and offers a versatile interface for users, providing a platform to quickly experiment with new physical models, numerical schemes, matrix solvers, and more. Some of its key features include:
• Exclusive Use of CFDStudio^™, a new integrated development environment for ANSWER^®, which significantly shortens the learning curve.
• A powerful yet simple, English-like FREEFORM^™ interface, allowing users to define complex problems with just a few simple commands.
• The ability for users to define new field variables with arbitrary names on the fly, without writing a single line of code.
• Users can solve an arbitrary number of new transport equations with user-defined properties, sources, and boundary conditions, all without needing to write code.
• The ability to implement arbitrary multi-step kinetics without any coding requirements.
• Users can define arbitrary and complex functions for sources, boundary conditions, field variables, and fluid and matrix properties using simple English-like commands.
• ANSWER^® provides a wide variety of physical sub-models for turbulence and combustion.
• ANSWER^® offers alternative numerical methods and matrix solvers to suit various simulation needs.
• ANSWER^® is highly modular and can seamlessly integrate external solvers, numerical methods, and problem-specific algorithm

Physics and Computational Features for the Detail-Oriented:

Among the notable features are:

• Gridless Computing (2D only, with 3D under development).
• Support for Voronoi Mesh
• Extended Support for Hybrid Elements, including prisms, pyramids, tetrahedra, and hexahedra (3D), as well as triangles and quads (2D). Any combination of these elements is acceptable.
• Adaptive Gridding/Auto Refinement, enabling grid adjustments at runtime based on specific criteria.
• If-Then-Else Conditional Statements, enhancing problem definition flexibility.
• Improved Matrix Solution Control, allowing for greater computational efficiency.
• Enhanced Interpolation Techniques, ensuring better accuracy in value computation at faces.

A wide variety of physical models are already implemented in ANSWER®.

• Transient or Steady state
• Compressible or Incompressible fluid
• Turbulence Models
  • Near wall models
    • Launder-Sharma
    • Chien
    • So-Sarkar
    • Yeang-Shih
  • Standard k-ε
  • k-ε with RNG
  • Non-linear Quadratic k-ε (Lumley-Shih)
  • Non-linear Cubic k-ε (Lumley-Shih)
  • Differential RSM (Craft-Ince-Launder)
  • LES (Implemented by UCLA/Northrop)
  • Wilcox's k-ω
  • Mentor's blended k-ε-ω
• Combustion models:
  • 1,2,3 and 4-Step Hydrocarbon Model
  • 3 or 5-Step Univ. of Washington Hydrocarbon Model
  • User-defined multi-step multi-species reaction systems with/without turbulence limiting
  • Arbitrary 1st, 2nd or 3rd order Arrhenius Kinetics with or without EBU/turbulent limiting
  • Fast-Chemistry assumed PDF
  • Flamelet (Implemented by Prof. Candel for SMECMA)
  • Mass Transport with Unlimited number of Species
• Sources:
  • Direct, Mass Injection, Solubility Limited, Radiation or Arrhenius Kinetics
  • Sources that are functions of surface area or volume
  • Functions of time, space or any dependent or user-defined variable
  • Any number and mix of sources for any variable
  • Boundary Conditions: Dirichlet, Neuman, Radiation and other derived types
• Heat Transfer:
  • Conjugate heat transfer with embedded solids
  • Sub-models for Spray, Radiation, Regeneration and other physical phenomena
  • Built-in six-flux radiation model
  • Interface with heat ordinate radiation model
• Geometry:
  • Structured or Unstructured Meshes or Voronoi Meshes
  • Arbitrary quadrilateral or Hexahedral control volumes
  • Specialized 2D and/or Cylindrical modes
  • Specialized 2D Cylindrical mode with a third swirl velocity component
  • Built-in geometry and meshing for geometrically and topologically simple problems