Since version 2026, Flux 3D and Flux PEEC are no longer available.

Please use SimLab to create a new 3D project or to import an existing Flux 3D project.

Please use SimLab to create a new PEEC project (not possible to import an existing Flux PEEC project).

/!\ Documentation updates are in progress – some mentions of 3D may still appear.

Improvements

Issues Short description of the source problem resolved in this version
Data Import/Export context SLVFX-

36908

 In Flux 2025.1, the Z-moment is now exported when global forces are exported from a generalized projection method in 2D and Skewed applications.
Data Import/Export context SLVFX-

36965

 In Flux 2025.1, the FFT Derived Data collections has been improved. The signal duplication is now done theoretically which avoid harmonics resulting of numerical noise and the computed harmonics are now limited to those under the cutoff frequency corresponding to 1/(4 dt).
Data Import/Export context SLVFX-

36907

 In Flux 2025.1, the full view option is now available in the IO context. Note that data support and data collection results are intrinsically full geometry and so are not rebuilt.
Data Import/Export context SLVFX-

33734

 In the Data Import/Export context, with Flux 2025.1 version, the absolute path of the files that users can import (*.fem, *.bulk) or export (*.fem, *.bulk, *.json, *.dat, *.nas, *.h3d, *.unv) can be up to 256 characters long, which significantly extends the previous limit of 80 characters.
Environment SLVFX-

37092

 We had a size limit of 43 characters for parameter names exported from Flux to HyperStudy. With Flux version 2025.1, we've increased this limit to 80 characters for parameter names.
Environment SLVFX-

35594

 In the 2025.1 version of Flux, users can now utilize formula expressions in Geometric, IO, and Spatial parameters with a limit of up to 1024 characters, a substantial increase from the previous restriction of 80 characters.
Mesh Import/Export SLVFX-

37047

 With the Flux release 2025.1, we reduce the required memory for bdf import of huge mesh (several tens of millions of elements).
Mesh Import/Export SLVFX-

35318

 With the Flux release 2025.1, we speed up the execution of bdf import of huge mesh (several tens of millions of elements).
Physics SLVFX-

35191

 In previous versions, the spatial linear isotropic model for a material's magnetic property B(H) could not be applied to laminated magnetic non-conducting regions, thus limiting the Flux capabilities in case for example of "frozen permeability" computations. As of Flux 2025.1, this restriction has been lifted: users can now assign a spatial linear isotropic model to laminated magnetic non-conducting regions in both 2D and 3D projects.
Physics SLVFX-

23499

 Until Flux 2025 version, materials with isotropic temperature-dependent B(H) property could not be assigned to Laminated Magnetic Non-Conducting regions. This limitation restricted the use of such regions in coupled simulations with thermal solvers. Starting with version 2025.1, Laminated Magnetic Non-Conducting regions now support all the five temperature-dependent B(H) laws available in Flux, allowing users to incorporate laminated magnetic cores in their co-simulations seamlessly.
Physics SLVFX-

36756

 With Flux 2025.1 version, the absolute path of the FTS files that users can export from a project and then import in another project to initialize the transient magnetic solution can be up to 256 characters long, which significantly extends the previous limit of 80 characters.
Physics SLVFX-

36233

 Starting from 2025 Flux version, "ferrites and powder cores" post-processing iron loss model was introduced. This model, applicable to magnetic non-conducting regions in Steady-State AC applications, was initially excluded from 2D-axisymmetric domains. In version 2025.1, the computation of iron losses with "ferrites and powder cores" model has been extended to these 2D-axisymmetric domains for the same kind of magnetic non-conducting regions in Steady-State AC applications. This enhancement enables users to compute losses on certain 3D geometries with symmetrical properties (e.g. transformers) in 2D-axisymmetric domains instead of 3D, and therefore saving modeling time and computing resources.
Solving SLVFX-

36850

 Since Flux 2025.1, when the iterative solver (PETSc) has a low convergence, a warning message will be displayed in the output window of Flux.
Solving SLVFX-

36280

 Since version 2025.1 of Flux, when iterative solver (PETSc) is used for pre-solving a Transient or a Steady State AC Magnetic project with solid conductors coupled with a circuit, MUMPS BLR will be automatically used as a preconditioner of the iterative solver, ensuring faster and more robust solving process.