in:Flux v5.3 Release Highlights

Added Network Post-Processing. Completed simulations that need new post-processing, for example after a monitor or a risk analysis is added, can now be processed on the ifx:Solve Service machines on the local network. The work is split by data file, and each machine takes the next file when it finishes its current file.

The Algebraic Multigrid (AMG) solver is now the default for the continuity (pressure correction) equation. AMG converges the long-wavelength pressure modes that the previous solvers could not reach within the iteration limit, such as ventilation balances between distant inlets and outlets and tall vertical channels. Improvements are also expected for projects that include partially enclosed, naturally ventilated buildings.
Improved the accuracy of enthalpy and temperature conversion for fluids with temperature-dependent heat capacity. The heat capacity is now integrated exactly with closed-form DIPPR expressions.
When “Age of Air” is selected in the Add Contour window, the color map maximum is now pre-filled with a physically meaningful value.
The Run drop-down in the Simulation Summary tab of the Risk Manager now offers Local, Network, and Cloud, matching the toolbar. Picking Network opens the Network Manager with only the newly added simulations selected.
Volume Analysis now shows ”-” when a simulation has no data for a value, for example a ventilation simulation under a flammable gas column, instead of 0.000. Exceedance curves skip these simulations instead of counting a zero.

Fixed an issue with hot-surfaces not contributing correct heating.
Fixed multiple stability issues in the solver.
Fixed issue introduced in version 5.2 where an HVAC on the wall of a room in an internal ventilation simulation could receive no inlet nodes or deliver only a fraction of its flow.
Fixed error “No valid entities were found in the file” when importing STEP and IGES files.
Fixed crash “Sequence contains no matching element” when adding streamlines with the preview on and a different simulation selected.
Fixed crash “Control’s handle must be created first” when opening a project by double-clicking a file while the update notification or the license window was shown.
Fixed crash (stack overflow) in the Add Contour window when the simulation changed while a time step was selected.
Fixed error opening a data file created with “Copy Project Data” when the geometry in the project had changed since the file was created.
Fixed issue where a simulation that had crashed in an earlier run was reported as crashed after a later successful network or cloud run.
Fixed issue where the linked transient plot windows (monitor point, line, surface, region, and gas cloud) kept plotting the original simulation after clicking a cell of another simulation.
Fixed a monitor group flashing in the property grid during a bulk simulation reset.
Fixed the Time cell in the property grid showing both the time editor and “Steady-state” when a visual item had no simulation.

September 10, 2026