The problem started after a security software update. Error may appear inconsistently.
Crash occurs when starting a new simulation component (e.g., dragging a "Fluid Flow" system). Diagnostic file may contain LICENSE or FLEXlm errors.
If you cannot interpret the file, save it and contact ANSYS Support—they will ask for it. 1. Insufficient System Memory (RAM / Virtual Memory) Why it happens: ANSYS Workbench can consume 8-32 GB of RAM depending on model size. When memory runs out, ansyswbu.exe crashes when trying to allocate additional space—for example, when updating a mesh or refreshing a result. The problem started after a security software update
The crash occurs when opening a specific project, but new projects work fine. Diagnostic file may show XML parsing error or unexpected end of file .
The diagnostic file shows std::bad_alloc or memory-related exceptions. Also, you may notice system slowdowns before the crash. Diagnostic file may contain LICENSE or FLEXlm errors
This error typically appears mid-simulation, during mesh generation, or even while simply opening a project. It forces an immediate shutdown of the Workbench user interface (WBU), leaving engineers scrambling to recover unsaved data. While the promise of a "diagnostic file" suggests a straightforward fix, the reality is that the root cause can range from insufficient RAM to corrupted project files, graphics driver conflicts, or licensing issues.
If you encounter this error repeatedly despite following the steps above, consider evaluating your workstation specifications against ANSYS’s hardware requirements, and ensure you are running a certified graphics driver configuration. Simulation stability begins with a stable foundation. Last updated: For ANSYS Workbench releases 2022 R1 through 2025 R1. Always consult the ANSYS Customer Portal for release-specific known issues and hotfixes. Insufficient System Memory (RAM / Virtual Memory) Why
By learning to locate and interpret the diagnostic file, following the structured troubleshooting workflow, and implementing preventive practices, you can reduce crash frequency and recover quickly when failures occur. Remember that ANSYS, Inc. provides excellent support when provided with the diagnostic files—so never delete them immediately.