Solver-Numerics

• Second order advection scheme is the default setting for all models, except for the mixture and Eulerian multiphase flows, which will remain first order by default

• Hybrid initialization method as default with enhanced initialization option settings (Steps in Using Hybrid Initialization)

• Convergence acceleration available for meshes containing highly stretched cells for the implicit density based solver (Convergence Acceleration for Stretched Meshes (CASM))

• High order term relaxation available when applying higher order spatial discretization (High Order Term Relaxation (HOTR))

• Preconditioned conjugate gradient method (CG) available as a stabilization method for the AMG linear equation solver (Setting the AMG Method and the Stabilization Method)

• Modifications to the expert settings for the pseudo transient method. Note that the old case settings for the pseudo transient method in the Expert tab of the Advanced Solution Controls dialog box are now obsolete and no backward compatibility is provided. Please update case files using FLUENT 14.0. (Setting Solution Controls for the Pseudo Transient Method)

Solver-Meshing

• Remeshing

  • Option to preserve interior surfaces for postprocessing following polyhedral mesh conversion via a TUI command (Converting the Domain to a Polyhedra)

  • Ability to switch from hanging node mesh representation to polyhedral mesh representation via a TUI command (Converting Cells with Hanging Nodes / Edges to Polyhedra)

  • Ability to remesh 3D wedge/prism cells in a boundary layer mesh as part of cell zone and face region remeshing methods (Cell Zone Remeshing Method and Face Region Remeshing with Prism Layers)

  • Ability to print the poor element statistics in the console via the Solution Methods task page (Repairing Meshes and Robustness on Meshes of Poor Quality)

  • Ability to automatically convert the cells that have hanging nodes / edges as a result of the CutCell zone remeshing to polyhedral cells (Using the CutCell Zone Remeshing Method)

• Dynamic Meshes

  • Ability to include polyhedral cells in dynamic mesh problems (Limitations)

  • Ability to specify that the diffusion coefficient is a function of the cell volume, when diffusion-based smoothing is used to update a dynamic mesh (Diffusivity Based on Cell Volume)

  • Ability to specify a piston pin offset for in-cylinder dynamic mesh applications (In-Cylinder Settings).

• Moving Meshes

  • Automatic calculation of rotational axis origin for nested sliding mesh reference frames

  • Ability to associate zone specific boundary motion with data from system couplings

Models

• Turbulence

  • Compatibility of the Spalart-Allmaras turbulence model with enhanced wall treatment (Spalart-Allmaras One-Equation Model)

  • Curvature correction available, but not applicable for 2d axisymmetric geometries (Including the Curvature Correction for the Spalart-Allmaras and Two-Equation Turbulence Models)

  • Algebraic Wall-Modeled LES available for the subgrid-scale models (Algebraic Wall-Modeled LES Model (WMLES) in the Theory Guide)

  • The implementation of the Delayed DES (DDES) shielding function, f_d (Equation 4–228 in the Theory Guide), has been optimized in the SST and Realizable k-ε Detached Eddy Simulation (DES) models to provide effective shielding. The constant was changed from 8 to 20. With this change, DDES is now the recommended shielding function for the SST k-omega model with Delayed DES enabled and is used by default.

• Heat Transfer

  • Ability to model heat transfer in porous media without the assumption of thermal equilibrium between the media and the fluid flow, via a dual cell approach (Non-Equilibrium Thermal Model)

  • Ability to create a duplicate mesh for a single fluid zone directly in FLUENT, e.g. when setting up a dual cell heat exchanger (Copying Cell Zones)

• Finite-Rate Chemistry Model

  • Ability to set the surface reaction parameters for the Non-Equilibrium Thermal Model using the define/models/species/surf-reaction-netm-param text command.

  • Ability to model chemically activated bimolecular pressure dependent reaction types (Inputs for Reaction Definition)

• Partially Premixed Combustion Model

  • Ability for internal combustion engines to convert products at the end of one cycle to inert for the next cycle when using the partially premixed combustion model (Modeling In Cylinder Combustion)

  • Ability to include the effects of heat loss or gain in the unburnt mixture, as well as equivalence-ratio fluctuations, on the laminar flame speed (Laminar Flame Speed in the Theory Guide)

• Reacting Channel Model

  • Ability to efficiently solve reacting flow in shell and tube heat exchangers (including curvilinear configurations) with long and thin channels (Reacting Channel Model)

• Solidification and Melting Model

  • Thermal and solutal buoyancy options available as full features (beta features in Release 13) (Modeling Thermal and Solutal Buoyancy )

• Discrete Phase Model

  • Stochastic secondary droplet (SSD) model available as full feature (beta feature in Release 13) (Modeling Spray Breakup)

  • Discrete Element Method (DEM) available as full feature (beta feature in Release 13) (Modeling Collision Using the DEM Model)

  • Implementation of a boiling rate equation for multicomponent particles to be able to simulate multicomponent vaporization when the total vapor pressure at the droplet surface exceeds the cell pressure

  • Improvements for handling particle interactions with moving walls for general meshes

  • Extension visualization of particle data, including filtering of particle tracks, sizing of particle spheres with any particle variable, and displaying DEM specific data to understand the particle physics (Specifying Particles for Display and Particle Filtering)

  • Ability to control the coupled heat-mass solution of droplets and multicomponent particles (Including Coupled Heat-Mass Solution Effects on the Particles) and to include vaporization options (Enabling Pressure Dependent Boiling and Including the Effect of Droplet Temperature on Latent Heat)

• VOF

  • Ability to model surface tension using continuum surface stress method (beta feature in Release 13) (Including Surface Tension and Adhesion Effects)

  • Coupled with volume fractions option for solving equations (Coupled Solution for VOF and Mixture Multiphase Flows, Selecting the Pressure-Velocity Coupling Method, and Controlling the Volume Fraction Coupled Solution)

• Eulerian Multiphase Model

  • Critical heat flux for wall boiling models available as full feature (beta feature in Release 13), including boiling model parameters (Including the Boiling Model)

  • Yao and Morel extension of the volumetric interfacial area transport model to include mass transfer and nucleation effects (beta feature in Release 13) (Defining the Interfacial Area Concentration)

  • Two new drag functions are available for granular flow: the Huilin and Gidaspow drag law and the Gibilaro drag law (Specifying the Drag Function)

  • The Immiscible Fluid Model from previous releases of ANSYS FLUENT has been renamed to Multi-Fluid VoF Model.

  • The Full Multiphase Coupled pressure-velocity coupling scheme from previous releases of ANSYS FLUENT has been renamed to Coupled with Volume Fractions and is now selected by choosing Coupled in the Solution Methods task page and enabling the Coupled with Volume Fractions option (Selecting the Pressure-Velocity Coupling Method).

• Eulerian Wall Film Model

  • Eulerian wall film model available as full feature (beta feature in Release 13) ("Modeling Eulerian Wall Films")

  • Heat transfer support for the Eulerian wall film model ("Modeling Eulerian Wall Films")

• Population Balance

  • Ability to include growth and nucleation phenomena for the Inhomogeneous Discrete population balance model

  • Availability of the DQMOM method in serial only (beta feature in Release 13) (Enabling the Population Balance Model)

• Acoustics

  • Ability to use the Ffowcs-Williams and Hawkings model to include convective effects (The Ffowcs-Williams and Hawkings Model in the Theory Guide) and specify the locations of moving receivers (Specifying Acoustic Receivers)

Material Properties

• Convection/diffusion controlled vaporization for droplets (Spalding mass transfer)

• Urea material extended to include droplet, particle mixture (urea-water) and mixture (urea-water-air) materials

• film-averaged temperature used for binary diffusivity of vaporizing droplets (Description of the Properties)

Mesh Morpher/Optimizer

• Ability to define the objective function that is minimized by the mesh morpher/optimizer as a custom function of output parameters, i.e., values from flux, force, surface integral, or volume integral reports (Setting Up the Mesh Morpher/Optimizer)

• Ability to define constraints on the boundary zones, in order to limit the freedom of particular zones that fall within the deformation region(s) during the morphing of the mesh (Setting Up the Mesh Morpher/Optimizer)

• Ability to specify commands that are executed before or after the calculation is run for each design stage generated by the mesh morpher/optimizer (Setting Up the Mesh Morpher/Optimizer)

Parallel Processing

• Improved distributed/shared memory hybrid AMG algorithm leading to significant improvements in solver scalability.

• Architecture-aware partitioning has been improved and is performed by default when the case file is read (Partitioning in the User’s Guide).

• Ability to extend exterior cell creation based on interface face and node coverage (Extended Neighborhood in the UDF Manual).

• Ability to use Laplacian-coefficient-based AMG coarsening to partition cases with highly stretched cells (Partition Methods in the User’s Guide)

• FLUENT now makes use of Platform MPI technology (formerly referred to as HP-MPI) from Platform Computing Corporation ("Parallel Processing")

• Support for PBS Professional in interactive mode (Starting ANSYS FLUENT Using FLUENT Launcher in the User’s Guide).

• Changes to supported platforms. (refer to the updated tables in "Parallel Processing").

• Increased performance of view factor calculations utilizing the GPGPU hardware (beta feature).

• Enable FLUENT UDFs to execute on GPUS (beta feature).

User-Defined Functions (UDFs) and User-Defined Scalars (UDSs)

• UDF access to model boiling parameters and quenching correction ( DEFINE_BOILING_PROPERTY in the UDF Manual)

• Linearized mass transfer UDF to model mass transfer in multiphase flows (beta feature in Release 13) ( DEFINE_LINEARIZED_MASS_TRANSFER in the UDF Manual)

• UDF access to customize the variables in the PDF look-up table ( DEFINE_PDF_TABLE in the UDF Manual)

Data Import and Export

• Ability to export solution data from select cell zone(s) to ANSYS CFD-Post, EnSight Case Gold, or FieldView formats (Exporting Solution Data after a Calculation)

• Ability to export a .cdat file for CFD-Post without also writing a case (.cas) file (ANSYS CFD-Post-Compatible Files and Exporting to ANSYS CFD-Post)

• Ability to export state (.cst) files , so that you can use CFD-Post to view most of the types of postprocessing surfaces created within FLUENT (e.g., isosurfaces) (ANSYS CFD-Post-Compatible Files and Exporting to ANSYS CFD-Post)

Graphics, Postprocessing, and Reporting

• Improved parallel simulation performance when using monitors

• Ability to calculate and postprocess time-averaged custom field functions

• Ability to display the time period over which data has been sampled for the postprocessing of the mean and RMS values

• Ability to set up multiple monitors in a single case for each one of the following: drag, lift, and moment (Setting Up Force and Moment Coefficient Monitors and Defining an Animation Sequence)

• Ability to plot and/or record how the objective function varies with each design stage when using the mesh morpher/optimizer (Setting Up the Mesh Morpher/Optimizer)

• Ability to postprocess the external temperature (shell), i.e., the temperature on the surface of a shell conduction wall that is away from the adjacent fluid/solid cell zone (Alphabetical Listing of Field Variables and Their Definitions)

• Ability to monitor and compute the uniformity index (weighted by area or mass) of a specified quantity over selected surfaces (Overview of Defining Surface Monitors and Generating a Surface Integral Report)

• The default settings for the Save Picture dialog box have been changed to save a color-scale copy of the picture in a JPEG format (Using the Save Picture Dialog Box)

User Interface

• Ability to set boundary conditions of same type using wildcards

Workbench

• Ability to perform one-way or two-way coupling with FLUENT and Ansoft products (Maxwell) (Performing FLUENT and Ansoft Coupling in Workbench)

• Output parameter support for drag, lift, and moments (Creating Output Parameters in the User’s Guide).

• Automatic compilation of UDF libraries by FLUENT ("Compiling UDFs" in the UDF Manual).

• Source term parameters no longer need to only be specified using SI units (FLUENT in Workbench User's Guide).

• New text user interface commands (/solve/set/number-of-iterations; /solve/set/number-of-time-steps; and /solve/set/max-iterations-per-time-step) to set the number of iterations or time-steps (applicable to FLUENT in Workbench) (FLUENT Text Command List).

Add-Ons

• Ability to extend a CFD analysis with detailed sensitivity data using the FLUENT Adjoint Model add-on (FLUENT Adjoint Solver Module Manual).

• Ability to perform battery modeling using FLUENT Battery Model add-on (FLUENT Battery Module Manual).