A new stable toolbox version, smarter turbulence modelling, and sharper design constraints: here’s everything that landed in ToffeeX this July.
The July 2026 update is anchored by a new stable toolbox version and a wave of improvements to how ToffeeX simulates turbulence and enforces design constraints. From more reliable optimization to finer control over two-fluid designs, here’s the full breakdown.
New Stable Toolbox Version: Jul-2026
A new stable toolbox version is now available. When creating a new toolbox, you can choose between Jan-26, Jul-26, or Latest, giving you the flexibility to lock in a validated version or stay on the cutting edge.
Existing toolboxes can be upgraded to Jul-26 or Latest at any time: click the three dots on the toolbox card and select Upgrade. During the upgrade, you can also choose exactly which runs to carry over into the newly created toolbox, so you keep only what’s relevant.
Improved Turbulence Modelling
The k-ε turbulence model is now solved with an improved realizability constraint. Unlike the standard k-ε model, the realizable variant enforces mathematical constraints on the Reynolds stresses, ensuring that normal stresses remain positive and that the Schwarz inequality for shear stresses is always satisfied.
In practice, this means greater stability across a wider range of flow conditions — including flows with strong curvature, recirculation zones, and boundary layers under adverse pressure gradients.
Improved Minimum Channel Clearance
The Minimum Channel Clearance (MCC) constraint is now applied directly during the optimization process, rather than only as a post-processing step. The optimizer is guided towards designs that stay sufficiently MCC-compliant throughout the run, reducing the risk of significant geometry degradation during the final post-processing step.
Improved Two-Fluid Wall Thickness Control
The Wall Thickness Constraint for two-fluid optimization is now enforced more effectively. This update improves the reliability and accuracy of wall thickness enforcement in two-fluid topology optimization runs, giving you designs that more consistently respect your separation and manufacturing requirements.
Improved Two-Fluid Volume Fraction Constraint
The Volume Fraction Constraint for two-fluid designs has been improved. You can now specify individual target percentages for Fluid 1 and Fluid 2, giving you finer control over how each fluid domain is distributed within your design.
Improved Seed Constraint
The Seed Constraint has been updated to improve stability and reliability during optimization. The latest version delivers faster convergence thanks to an improved algorithm, which finds compliant designs more quickly and more consistently.
