FLUENT

FLUENT
Name	FLUENT
Developer	Ansys
Released	1980s
Programming language	Fortran, C++
Operating system	Microsoft Windows, Linux, macOS
Genre	Computational Fluid Dynamics
License	Proprietary

FLUENT

FLUENT is a commercial computational fluid dynamics (CFD) software package widely used in engineering and scientific research. It is employed for simulating fluid flow, heat transfer, and related phenomena across industries and academic institutions, enabling analysis for projects tied to NASA, European Space Agency, Boeing, General Motors, Siemens, and Toyota. The software integrates with design and simulation ecosystems used by MIT, Stanford University, Imperial College London, ETH Zurich, and National University of Singapore researchers.

Overview

FLUENT provides a solver framework for single-phase and multi-phase flows, turbulent combustion, and reacting flows, linking to visualization and pre/post-processing tools found in suites like ANSYS Workbench, ParaView, Tecplot, HyperMesh, and Gmsh. Users from Lockheed Martin, Ford Motor Company, BMW, Shell, and ExxonMobil model aerodynamic performance, internal combustion, pollutant dispersion, and process equipment. FLUENT supports boundary conditions and discretization strategies compatible with mesh formats produced by ICEM CFD, Gambit, Pointwise, ANSYS Meshing, and legacy grid systems used at Lawrence Livermore National Laboratory.

History and Development

Development traces to proprietary CFD efforts in the 1980s and 1990s that converged into commercial packages adopted by aerospace and automotive firms such as McDonnell Douglas and General Electric. The software became part of acquisitions and partnerships that involved companies linked to Fluent Inc. and later Ansys, reflecting consolidation trends similar to mergers involving Siemens PLM and MSC Software. Key milestones include expansions to handle turbulence models popularized by researchers at Princeton University, Stanford University, and Cornell University and incorporation of numerical schemes developed in collaborations with groups at Sandia National Laboratories and Argonne National Laboratory.

Features and Capabilities

FLUENT implements a broad range of models: Reynolds-averaged Navier–Stokes (RANS) turbulence closures like k-epsilon and k-omega, large eddy simulation (LES) formulations adopted by teams at NASA Langley Research Center and DLR; detached eddy simulation (DES); and Reynolds stress models used in studies from Imperial College London. Multi-phase capabilities include volume of fluid (VOF), Eulerian/Eulerian, and discrete phase models (DPM) used in work at University of Michigan and Carnegie Mellon University. Combustion and chemical kinetics functionality ties into mechanisms from Sandia National Laboratories and studies by Princeton Plasma Physics Laboratory. Heat transfer modules support conjugate heat transfer cases applied in projects at MIT Lincoln Laboratory and CERN experiments. Boundary condition and mesh-handling features accommodate structured, unstructured, and hybrid grids produced by partners like ANSYS Meshing and ICEM CFD.

Technical Architecture

The solver core is implemented in high-performance languages and optimized for distributed-memory and shared-memory architectures used in clusters at Oak Ridge National Laboratory and Lawrence Berkeley National Laboratory. Parallelization relies on MPI implementations common to systems at National Center for Supercomputing Applications and accelerators via OpenMP and GPU offloading strategies tested on platforms from NVIDIA and AMD. Numerics include finite-volume discretization, upwind differencing, pressure-velocity coupling schemes such as SIMPLE and PISO, and linear solvers integrated with libraries used by Cray Research and IBM supercomputers. I/O interoperates with file formats recognized by HDF5-based workflows and visualization tools prevalent at Los Alamos National Laboratory.

Applications and Use Cases

FLUENT is applied across sectors: aerodynamic design in projects by Airbus, Boeing, and Rolls-Royce; internal combustion and emissions modeling by Cummins and Daimler; HVAC and urban airflow studies commissioned by municipal programs like those in New York City and Singapore; chemical reactor and process modeling for firms such as BASF and Dow Chemical; and biomedical flow simulations in collaborations with Johns Hopkins University, Mayo Clinic, and Imperial College Healthcare NHS Trust. It supports studies informing regulatory submissions to agencies including EPA and European Chemicals Agency.

Performance and Validation

Validation work has been published in journals and conferences attended by researchers from ASME, AIAA, ICCFD, APS Division of Fluid Dynamics, and EUROMECH showing comparisons against experimental datasets from wind tunnels at NPL and shock-tube results from Oxford University. Benchmarks assess scalability on systems at NERSC and resilience in industrial pipelines used by TotalEnergies and Schlumberger. Independent studies often contrast FLUENT results with those from open-source codes used at Los Alamos National Laboratory and Princeton University to evaluate model fidelity in turbulence and combustion predictions.

Licensing and Availability

FLUENT is distributed commercially by Ansys under proprietary licensing models offered for perpetual, subscription, and academic use, similar to commercialization strategies by MathWorks and Dassault Systèmes. Academic licenses are available to institutions like University of Cambridge and University of Tokyo through campus agreements. Support and training are provided via Ansys channels and authorized resellers with partner networks comparable to those of IBM and Siemens.

Category:Computational fluid dynamics software