Turn surfaces, liquid regions, and boundary conditions into a simulation setup.

• Surface-mesh import

  Implemented

  Load STL, OBJ, PLY, glTF, and GLB geometry from your modelling tools.

• Immersed geometry

  Implemented

  Represent vessel walls and internal surfaces within the solver’s particle or Cartesian-grid discretisation.

• Initial liquid regions

  Implemented

  Define the initial liquid with surfaces and fluid seeds, and inspect the fill preview in the scene.

• Visual scene authoring

  Implemented

  Edit geometry, materials, initial liquid, prescribed motion, and measurement regions in contextual inspectors.

• Periodic boundaries

  Implemented

  Use periodic domain axes in compatible solver configurations.

• Domain inlets and pressure outlets

  Experimental

  Prescribe inlet velocity or outlet pressure on domain faces, with availability determined by the selected method. Pressure outlets can use a hydrostatic reference level to help keep water at rest under gravity.

• Mesh-surface inflow

  In development

  Prescribed discharge and particle emission exist in FLIP/FIRM; broader surface shapes, motion, and flow enforcement are being developed.

• Finite mesh-surface outlets

  Planned

  Outflow through a bounded surface, with particle removal and independent discharge measurements.

Prescribe how the geometry moves and follow the free surface it drives.

• Incompressible free-surface flow

  Implemented

  Single-liquid simulation with particles tracking the moving liquid and a grid solving pressure.

• Prescribed rigid-body motion

  Implemented

  Author translations and rotations with keyframes and time-dependent motion sources.

• Animation timeline and preview

  Implemented

  Edit keyframes and preview the body motion before running the fluid simulation.

• Moving reference frames

  Implemented

  Model prescribed domain translation; rotating-frame forces are available in compatible FLIP and meshless configurations.

• Adaptive time stepping

  Implemented

  Use CFL-based time-step control with a maximum step, or select a fixed step for a controlled study.

• Surface tension

  Experimental

  Include capillary forces in supported free-surface formulations. Compatible PF-FLIP setups use sharp interfaces and carried curvature by default, with particle advection selected automatically.

• Contact angles and wetting

  Experimental

  Static wetting and selected dynamic or hysteretic models, with an experimental wall-energy method for surface-tension simulations.

• Wave-generation boundaries

  In development

  Analytical wave targets with direct and relaxation-zone wave generation.

A native compute pipeline built around GPU execution, with a live view of the run.

• GPU-native simulation

  Implemented

  Fluid kernels, intermediate fields, and reductions execute on the GPU, with compact measurements returned to the application.

• Vulkan backend

  Implemented

  The Windows and Linux package configuration uses Vulkan with a compatible GPU and vendor driver.

• Sparse FLIP grids

  Implemented

  Use sparse tiled grids around the active liquid for the particle/grid solver.

• Live 3D visualisation

  Implemented

  Inspect the evolving liquid, geometry, and supported scalar-field colouring while a simulation runs.

• Cutting planes

  Implemented

  Use an interactive slice plane to inspect the interior of the displayed model.

• Run controls and diagnostics

  Implemented

  Start, pause, step, or reset a simulation and follow numerical diagnostics, measurement graphs, and logs.

• CUDA backend

  Experimental

  An optional NVIDIA compute path in development builds, separate from the Vulkan download configuration.

Fluid models, method choices, and coupling to bodies and other solvers.

• Newtonian viscosity

  Implemented

  Vary density and viscosity across Newtonian flow regimes, with implicit viscosity solver support.

• Fluid-driven rigid bodies

  Experimental

  Six-degree-of-freedom (6-DOF) either imposed or reactive body coupling.

• External structural coupling

  Experimental

  Native coupling (through preCICE on Linux), including the CalculiX adapter, for force and motion exchange on fixed-topology surfaces.

• Resolved liquid–gas flow

  Experimental

  Simulate liquid and gas together, with configuration-specific density-ratio and interface behaviour. PF-FLIP can use volume correction to limit liquid-volume drift during expansion; gas is incompressible by default.

• Compressible air in closed tanks

  Experimental

  An optional compressible-air model for closed-tank PF-FLIP simulations; experimental and off by default.

• Turbulence and wall treatment

  In development

  Finite-volume SST k–ω turbulence with resolved walls or a smooth-wall Spalding treatment.

• Non-Newtonian models

  In development

  Add constitutive models for fluids whose viscosity changes with shear or deformation.

• Viscoelasticity models

  Planned

  Represent fluids with both viscous and elastic response through planned constitutive models.

• Heat transfer

  Experimental

  Transport temperature through the liquid, with buoyancy, and exchange heat with walls and bodies at a set temperature, a set heat flux or through a surface film. Liquid side only; the gas side and phase change are planned.

• Phase-change and boiling

  Planned

  Simulate phase change, including boiling and condensation.

Run many variants, capture the quantities behind a design decision, and take them into your analysis tools.

• Easy setup files

  Implemented

  Save and reload JSON setups, share common inputs through inheritance, and run the same setup from the command line.

• Study comparisons and automation

  Implemented

  Run multi-case studies from the command line and write comparisons as JSON, CSV, and Markdown.

• Numerical controls

  Implemented

  Choose resolution, time stepping, and solver settings. FLIP offers Basic, Advanced, Expert, and Search views.

• Pressure and velocity probes

  Implemented

  Sample selected regions and display time histories. Pressure probes measure fluid regions rather than wall-pressure taps.

• Automatic measurement CSV

  Implemented

  Record configured probes and body measurements during the run, with separate files for successive runs.

• Body motion, forces, and moments

  Implemented

  Track named bodies and export motion or integrated loads where the selected method provides them.

• VTK field and surface export

  Implemented

  Export supported particle fields, finite-volume grids, and reconstructed free surfaces for external post-processing.

• Checkpoint and restart

  Implemented

  Resume supported FLIP and meshless runs after reopening a desktop document, or configure checkpoints in CLI setups. Restart begins at time zero; persistent finite-volume restart is not yet available.

• Python runtime

  Experimental

  Configure, validate, and step simulations in-process from Python, for example inside an external optimisation loop. The initial package targets Linux x86_64 with Vulkan.

Machine-readable setup documents and packaged tools that software can use to validate and run CFD tasks.

• Machine-readable setup schema

  Implemented

  A generated JSON schema describes the setup document, and setups and studies can be validated from the command line without starting a simulation.

• Agent Pack CLI and MCP tools

  Implemented

  Windows and Linux desktop packages include tools to validate setups and run task-based CFD workflows from the command line or through MCP.

• Local setup assistant

  Experimental

  A prototype that runs locally and turns a short English description of a partially filled tank under sinusoidal motion into a reviewable setup. Running the simulation stays a separate step.

• Assistant-guided studies

  Planned

  Set up, run, and summarise a study together with an assistant inside the workspace.