Ansys FreeFlow is a smoothed-particle hydrodynamics (SPH) simulation software for single-phase free-surface flows.
Ansys FreeFlow was designed to provide an engineering tool for tackling complex free-surface flow applications. It offers a detailed and realistic representation of physical processes that are challenging to simulate with other methods.
Ansys FreeFlow offers a comprehensive platform to simulate single-phase free-surface flows. It offers two different solver approaches: an implicit incompressible and a weakly compressible. Its powerful GPU-based solver efficiently manages large-scale simulations featuring millions of SPH elements.
July 2025
In 2025 R2, Ansys FreeFlow is now fully released, and some of the new features include a surface tension model and SPH spray nozzle module. For multiphysics, there are Ansys Mechanical 1-way and 2-way coupling, as well as Ansys Motion 2-way coupling. Additionally, there are FreeFlow Customization and Automation Solver SDK (Software Development Kit) and Pre-post scripting options.
The surface tension model provides precise determinations of fluid surface tension, making it useful for applications like droplet formation and flow interactions with various geometries. New curves and properties related to SPH Elements are now available, and the SPH Spray Nozzle module is downloadable.
One-way thermal coupling allows users to export HTC to Ansys Mechanical for further thermal analysis. For Ansys Mechanical 2-way coupling, FreeFlow sends the SPH forces to Mechanical, which calculates deformations and sends the displacements back to FreeFlow. Ansys Motion's two-way coupling enables complex, nested, and chained motions, as well as the stress and deformation of flexible body components.
FreeFlow automation and customization through Solver SDK (Software Development Kit) and PrePost Scripting. One example is the module SPH Freeze Outside Region, which freezes SPH elements outside ROIs and disables the calculation of the interaction, thereby saving resources and reducing simulation time.
It's vital to Ansys that all users, including those with disabilities, can access our products. As such, we endeavor to follow accessibility requirements based on the US Access Board (Section 508), Web Content Accessibility Guidelines (WCAG), and the current format of the Voluntary Product Accessibility Template (VPAT).
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