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Sim4Life V9.4 was released on March 5, further strengthening its position as the platform of choice for neurostimulation modeling, with targeted improvements to quality, robustness, and usability driven by demanding real-world application work. Key highlights of the new release include: Thermal unstructured stationary solver: New solver enabling the calculation of steady-state temperature distribution in complex geometries using an unstructured mesh. NVIDIA Blackwell GPU support: Added support for NVIDIA Blackwell architecture GPUs, ensuring compatibility with NVIDIA’s next-generation GPU hardware. Improved alignment between GUI and Python workflows , a clearer API structure, and more accessible documentation support large-scale, script-driven studies. Rebuilt manual and Python API reference for an improved browsing experience and search functionality. Stability, performance, and quality assurance: Improved robustness and performance for complex, large-scale models Cleaner, more consistent user interface (Web version) to improve focus during modeling and simulation setups. Integrated AI assistant (Web version): Accessible directly from the search bar to answer questions about tools, workflows, solvers, and APIs. Sim4Life V9.4 Web is available on all our cloud platforms for commercial users, researchers, and students. Sim4Life V9.4 Desktop is available directly through the Automatic Software Update window in the Sim4Life GUI. Your current license file provided by ZMT remains valid for this version. A detailed list of all changes can be found in the Release History. We thank you for your valuable feedback and hope this release further enhances your productivity and workflows. For additional feedback or suggestions, please feel free to contact us at s4l-sales@zmt.swiss. The Sim4Life Team

When the stop button is pushed in the task manager, while a simulation is running, it will generate an event that is equivalent to "enforcing" a "convergence reached" state from the solver perspective. That's why the following log will appear inside the Solver-Log tab WARNING: [...] Simulation end request received. The solvers starts to consider this. Steady state detected at iteration x, remaining time steps are y. Simulation performed z iterations. Elapsed time for 'Time Update' was xx:xx:xx wall clock time.

Hello, When you only use a single manual grid (0.7 mm) on the bounding box, the entire domain - including the electrodes - is discretized uniformly at that resolution. While 0.7 mm is reasonably fine, it may still be too coarse to accurately capture the very steep electric field gradients near the electrodes, especially for TI setups where interference patterns are sensitive to local field accuracy. When you enable Automatic Grid settings for the electrodes, the solver applies local mesh refinement around those electrode regions. This typically results in a smaller minimum step size near the electrodes than your global 0.7 mm grid. That improved resolution leads to more accurate current density and E-field calculations at the source, which then propagates into differences in the resulting interfering field. So the change you see is not an error - it’s actually a sign that the solution is sensitive to mesh resolution near the electrodes, which is expected. Regarding your other question: Using a bounding box vs. explicitly listing all head tissues generally does not change the result if the grid settings are identical, because the box already encloses all tissues. It’s mostly a workflow/simplicity choice. I hope this information helps.