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Ansys FreeFlow™ 
Smoothed-Particle Hydrodynamics (SPH) Simulation Software 

Ansys FreeFlow is a smoothed-particle hydrodynamics (SPH) simulation software for single-phase free-surface flows. 

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Ansys FreeFlow

A Powerful Solution to Simulate Fluid Flow Applications

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. 

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    Multi-GPU Solver
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    Scalable, efficient, large SPH element counts
A Powerful Solution to Simulate Fluid Flow Applications
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Quick Specs

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.

  • Single-phase SPH Solvers
  • Surface Tension Modeling
  • Thermal Solver
  • Coupling with Ansys Motion
  • Coupling with Ansys EnSight
  • Pre and Post Scripting

FAQs

SPH is a mesh-free Lagrangian method for simulating fluid flow and other physical phenomena. It represents fluids as a collection of elements and uses a smoothing kernel to interpolate properties between neighboring elements. This allows it to model complex fluid behavior.

Ansys FreeFlow is a general-purpose smoothed-particle hydrodynamics (SPH) software used to simulate single-phase free-surface flows, offering two different solver approaches: an implicit incompressible and a weakly compressible. FreeFlow provides a modern, user-friendly interface streamlining the SPH process from pre- to post-processing within a single window workflow. And its powerful GPU-based solver manages large-scale simulations featuring millions of SPH elements efficiently. 

Current customers can download Ansys FreeFlow from the Download Center in the Ansys Customer Portal. Those who are not current customers but are interested in trying FreeFlow can contact us for more information.

To learn more about Ansys FreeFlow and SPH, refer to the following resources:

March 2026

What's New

Ansys FreeFlow 2026 R1 features Adaptive Element Size, enhancing performance and accuracy in fluid flow simulations. Furthermore, new multiphysics couplings enhance visualization and analysis across complex workflows.

Freeflow Periodic Continuous Injection
SPH Simulation

A new implementation for time-periodic control in SPH fluid inlets has been introduced. Additionally, an implicit calculation for viscous forces applicable to both Newtonian and non-Newtonian fluids has been implemented. And the flat plate heat transfer coefficient (HTC) correlation will now be calculated internally by the FreeFlow solver.

Freeflow Tank Sloshing EnSight
Multiphysics Coupling

A new enhanced version of the integration between FreeFlow and Ansys optiSLang and post-processing using Ansys EnSight. 

Freeflow Adaptive SPH Element Size
Performance and Usability

Adaptive SPH Element Size, reducing overall particle count and speeding up simulations. Extend SPH Flowmeters: Measures the average of velocity (or temperature) of the flow over a given surface.

Ansys software is accessible

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).

View VPAT Reports