Ansys

ANSYS FLUENT

ANSYS FLUENT contains comprehensive modeling capabilities to enable you to model flow, turbulence, heat transfer, and reactions for a wide range of industrial applications. Special models also provide the ability to model in-cylinder combustion, aeroacoustics, turbomachinery, and multiphase systems.

Related Resources

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Download: ANSYS Capabilities Chart 15.0 (1020 KB)

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Overview

Today, thousands of companies throughout the world benefit from the use of ANSYS FLUENT software as an integral part of their design and optimization phases of product development. Advanced solver technology provides fast, accurate CFD results, flexible moving and deforming meshes, and superior parallel scalability. User-defined functions allow the implementation of new user models and the extensive customization of existing ones. ANSYS FLUENT’s interactive solver set-up, solution, and post-processing make it easy to pause a calculation, examine results with integrated post-processing, change any setting, and then continue the calculation within a single application. Case and data files can also be read into ANSYS CFD-Post for further analysis with advanced post-processing tools and to compare results from different cases side-by-side.

The integration of ANSYS FLUENT into ANSYS Workbench, provides users with superior bi-directional connections to all major CAD systems, powerful geometry modification and creation with ANSYS DesignModeler and advanced meshing technologies in ANSYS Meshing. It allows brings the easy drag-and-drop transfer of data and results to share between applications (e.g. to use a fluid flow solution in the definition of a boundary load of a subsequent structural mechanics simulation). Combine these benefits with the extensive range of physical modeling capabilities and fast, accurate CFD results that ANSYS FLUENT software has to offer and you have one of the most comprehensive software packages for CFD modeling available in the world today.

Solution Optimiser, Adjoint Solver and Mesh Morpher

ANSYS Fluent software offers shape optimisation capabilities that can automatically adjust the geometric parameters of a specific design until specified optimization goals for that design are met. Examples include optimised aerodynamics of a car or aircraft wing and the optimised flow rate in nozzles and ducts. ANSYS Fluent can also be used with optimisation software from ANSYS partners, including TOSCA and Optimus

Furthermore, ANSYS Fluent offers ground-breaking adjoint solver technology. The adjoint solver allows you to get information about how you should modify your geometry to achieve your design goals, by modifying the mesh from within to see the effect of the recommended change. It provides information in a single simulation that is very difficult and expensive to gather using other methods. The adjoint method computes the derivative of engineering quantities with respect to the system inputs. The discrete adjoint solver is available for examining down force (for F1 applications), decreasing drag (for automobiles), and reducing total pressure drop (for ducts and pipes). The adjoint solver performs robustly and excellent scalability on large meshes of more than 10 million cells.

ANSYS Fluent can automatically optimise the velocity distribution at the exit of an L-shaped duct.
ANSYS Fluent can automatically optimise the velocity distribution at the exit of an L-shaped duct.
ANSYS Fluent adjoint solver indicates the necessary shape changes to ensure maximum down force for a race car
ANSYS Fluent adjoint solver indicates the necessary shape changes to ensure maximum down force for a race car

Mesh Flexibility and Accurate Numerics

ANSYS FLUENT provides complete mesh flexibility, including the ability to solve your flow problems using unstructured meshes that can be generated about complex geometries with relative ease. Supported mesh types include triangular, quadrilateral, tetrahedral, hexahedral, pyramid, prism (wedge), and polyhedral meshes. In particular, the automatic nature of the techniques used to create polyhedral meshes saves you time, and, since a polyhedral mesh contains many fewer cells than the corresponding tetrahedral mesh, convergence is faster.

Sophisticated numerics ensure accurate results on any combination of mesh types, including (hybrid) meshes with hanging nodes and non-matching mesh interfaces. ANSYS FLUENT also allows you to refine or coarsen your mesh based on the flow solution. ANSYS FLUENT runs robustly and efficiently for all physical models and flow types, steady-state or transient, incompressible or compressible flows (from low subsonic to hypersonic), laminar or turbulent flows, Newtonian or non-Newtonian flows, ideal or real gases, etc.

Polyhedral mesh and pressure distribution on an F1 car post-processed using ANSYS CFD-Post Software
Polyhedral mesh and pressure distribution on an F1 car post-processed using ANSYS CFD-Post Software

Powerful and Scalable High-Performance Computing Capabilities

ANSYS FLUENT provides powerful and scalable high-performance computing (HPC) options. Parallel processing with ANSYS CFD HPC allows you to consider higher-fidelity CFD models – including more geometric detail larger systems (e.g., a full 360 degrees blade passage rather than a single blade one), and more complex physics (e.g., an unsteady turbulence rather than a steady turbulence model). In fact, using 64-bit technology, ANSYS FLUENT can run parallel calculations on meshes consisting of a billion cells or more. The result is enhanced insight into product performance – insight that can’t be gained any other way. This detailed understanding can yield enormous business benefits – revealing design issues that might lead to product failure or troubleshooting delays. Using HPC to understand detailed product behavior, you can gain confidence in your design and ensure that your product will succeed in the market.

ANSYS CFD HPC also increases throughput by speeding up turn-around time for individual CFD simulations. This enables you to consider multiple design ideas and make the right design decisions early in the design cycle. Therefore, using ANSYS CFD HPC helps make your engineering staff, and your product development process, more productive and efficient.

The ANSYS FLUENT technology incorporates optimization for the latest multi-core processors and benefits greatly from recent improvements in processor architecture, algorithms for model partitioning, combined with optimized communications and dynamic load balancing between processors. ANSYS CFD HPC is trivial to use, and works exceptionally well from multi-core desktop workstations to high-end HPC clusters. Linear scalability has been shown on systems with more than a thousand processors!

Scaling of ANSYS FLUENT  12.0 software is nearly ideal up to 1,024 processors and 78 percent of ideal at 2,048 processors. Data courtesy SGI, based on the SGI Altix® ICE  8200EX using Intel Xeon® quad-core processors with Infiniband®
Scaling of ANSYS FLUENT 12.0 software is nearly ideal up to 1,024 processors and 78 percent of ideal at 2,048 processors. Data courtesy SGI, based on the SGI Altix® ICE 8200EX using Intel Xeon® quad-core processors with Infiniband®

Dynamic & Moving Mesh

The dynamic mesh capability in ANSYS FLUENT meets the needs of challenging applications, including in-cylinder flows, valves and store separation. Several different mesh rebuilding schemes, including layering, smoothing and remeshing, can be used for different moving parts within the same simulation as needed. Only the initial mesh and a description of the boundary movement are required. A built-in six-degrees-of-freedom solver is also available for applications with unconstrained motion, including store separation, ship hydrodynamics, missile launch, and tank sloshing. Dynamic meshing is compatible with a host of other models including ANSYS FLUENT’s suite of spray breakup and combustion models and multiphase models including those for free surface prediction and compressible flow.

ANSYS FLUENT also provides sliding mesh and multiple reference frame models that have a proven track record for mixing tanks, pumps, and turbomachinery.

Internal combustion engine modeling using ANSYS  FLUENT moving and deforming mesh models and post-processed using ANSYS CFD-Post software
Internal combustion engine modeling using ANSYS FLUENT moving and deforming mesh models and post-processed using ANSYS CFD-Post software

Turbulence & Acoustics

ANSYS FLUENT offers an unparalleled breadth of turbulence models including several versions of the time-honored k-epsilon and k-omega models, as well as the Reynolds stress model (RSM) for highly swirling or anisotropic flows. Recent increases in computer power at reduced cost are making the large eddy simulation (LES) model and the more economical detached eddy simulation (DES) model very attractive choices for industrial simulations. Innovative models are also available such as turbulent transition models for the detailed modeling of the transition from laminar to turbulent flow that occurs near wall boundaries and the newly available Scale-Adaptive Simulation (SAS) model which provides a steady solution in stable flow regions while resolving turbulence in transient instabilities like massive separation zones, without an explicit grid or time step dependency. The SAS model has shown excellent results on numerous validation cases, and provides an excellent option for applications in which resolution of turbulence is required.

For acoustics, ANSYS FLUENT can compute the noise resulting from unsteady pressure fluctuations in several ways. Transient LES predictions for surface pressure can be converted to a frequency spectrum using the built-in Fast Fourier Transform (FFT) tool. The Ffowcs-Williams & Hawkings acoustics analogy can be used to model the propagation of acoustics sources for various objects, ranging from exposed bluff bodies to rotating fan blades. Broadband noise source models allow acoustic sources to be estimated based on the results of steady-state simulations.

Vortex structures generated by aircraft landing gear
Vortex structures generated by aircraft landing gear

Heat Transfer, Phase Change & Radiation

Heat transfer accompanies many fluid flow phenomena and ANSYS FLUENT offers a comprehensive suite of options for convection, conduction and radiation. Several radiation models are available, including the P1 and Rosseland models for optically thick, participating media, and the view-factor based surface-to-surface model for non-participating media. The discrete ordinates (DO) model is also available and suitable for any medium, including glass. Additionally, a solar load model is available for climate control simulations and two heat exchanger models are available. Other capabilities closely associated with heat transfer include models for cavitation, compressible liquids, shell conduction, real gasses and wet steam.

Uranium melt and solidification in a failed reactor
Uranium melt and solidification in a failed reactor

Reacting Flow

Chemical reaction modeling, especially in turbulent conditions, has been a hallmark of ANSYS FLUENT software since its inception. ANSYS FLUENT uses newer models such as the eddy dissipation concept, PDF transport and stiff finite rate chemistry models, as well as mature models such as the eddy dissipation, equilibrium mixture fraction, flamelet and premixed combustion models. In-situ adaptive tabulation (ISAT) can be used in conjunction with either the EDC or PDF transport models and provides acceleration for turbulent finite rate chemistry, speeding up calculations by an order of magnitude or more. The standard reacting flow models available in ANSYS FLUENT can be used to tackle a vast array of gaseous, coal and liquid fuel combustion simulations. Special models for the prediction of SOx formation and NOx formation and destruction are also available. ANSYS FLUENT’s surface reaction capability allows for reactions between gas and surface species, as well as between different species, so that deposition and etching can be rigorously predicted. ANSYS FLUENT’s reaction models can also be used in conjunction with the real gas model and LES and DES turbulence models.

Low NOx burner. Courtesy of GE Energy
Low NOx burner. Courtesy of GE Energy

Multiphase

ANSYS FLUENT is a leader in multiphase modeling technology. Its varied capabilities allow engineers to gain insight into equipment that is often difficult to probe. ANSYS FLUENT makes use of the Eulerian multiphase model with its separate sets of fluid equations for interpenetrating fluids or phases, as well as offering a more economical mixture model. Both models can also handle granular flows. Several other multiphase models are also standard in ANSYS FLUENT. For some multiphase applications such as spray dryers, liquid fuel sprays, continuous fiber drawing and coal furnaces the discrete phase model (DPM) can be used. The volume of fluid model is available for free surface flows, such as ocean waves, where the prediction of the interface is of interest. The cavitation model has proven useful for robustly modeling hydrofoils, pumps and fuel injectors. Several population balance models are also available for modeling size distributions.

Bubbles in a fluidized bed
Bubbles in a fluidized bed

Post-Processing and Data Export

ANSYS FLUENT’s post-processing tools can be used to generate meaningful graphics, animations and reports that make it easy to convey CFD results. Shaded and transparent surfaces, pathlines, vector plots, contour plots, custom field variable definition and scene construction are just some of the post-processing features that are available. Solution data can be exported to ANSYS CFD-Post, third party graphics packages, or to CAE packages for additional analysis. Under the ANSYS Workbench environment, ANSYS FLUENT solution data can be mapped to ANSYS simulation surfaces for use as thermal or pressure loads. In standalone mode, ANSYS FLUENT, can also map structural and thermal loads on surfaces and temperatures in volumes from ANSYS FLUENT to 3rd-party FEA meshes.

Different designs can be compared directly in ANSYS CFD-Post, both visually and quantitatively
Different designs can be compared directly in ANSYS CFD-Post, both visually and quantitatively

Customization & Project-wide Scripting

User-defined functions are a popular option for users wanting to customize ANSYS FLUENT. Comprehensive documentation and a number of tutorials are available, as is full technical support. The ANSYS global consulting network can provide or help create templates for the repeated setup of any equipment. Add-on modules for many special applications are available, such as PEM and solid oxide fuel cells and magnetohydrodynamics. Finally, most user operations within ANSYS FLUENT can be recorded, modified, and combined with Workbench (project-wide) scripting tools for parameter/file/data management as well as design exploration.

Anisotropic diffusion of a drug from a stent into a capillary wall
Anisotropic diffusion of a drug from a stent into a capillary wall