Ansyswbuexe Encountered A Problem A Diagnostic File Has Been Written New May 2026
This article explains what the message means, common causes, and a step‑by‑step guide to diagnose and fix the problem when Ansys Workbench (ansyswb.exe / ansyswbuexe) crashes and reports a diagnostic file was written.
No single trigger causes this error. Instead, it emerges from several distinct categories of failure. Recognizing which category applies to your case is the first step toward a solution.
1. Memory Exhaustion (The Most Frequent Culprit)
ANSYS solvers are memory-hungry. Large models with millions of nodes, nonlinear contacts, or iterative solvers can easily exceed available RAM. When Windows cannot allocate a required block of memory, ansyswbuexe attempts to access a null or invalid pointer, triggering a crash. The diagnostic file will often show an allocation failure just before the fault. Solution: Reduce model size, use cyclic symmetry, switch to a distributed memory solver, or add physical RAM.
2. Corrupted Geometry or Mesh A single inverted element, a zero-thickness layer, or a degenerated contact surface can cause the solver to perform an illegal mathematical operation. For example, a Jacobian determinant approaching zero in an element will cause the stiffness matrix to become singular. The solver does not gracefully exit; it crashes. Solution: Use the “Mesh Metric” tools to check for skewness and orthogonal quality. Run a “Geometry Check” in DesignModeler. Simplify or defeature problematic regions. This article explains what the message means, common
3. Software Incompatibilities
This error is notorious after a Windows update, an antivirus definition update, or an ANSYS point release upgrade. Real-time scanning by McAfee, Norton, or even Windows Defender can lock temporary solver files, causing ansyswbuexe to lose access to critical data. Similarly, using an older version of ANSYS on Windows 11 may trigger deprecated system calls. Solution: Exclude ANSYS temporary folders from antivirus scans. Ensure that the exact ANSYS version is certified for your OS version.
4. User-Specified Solver Settings Certain advanced settings can crash the solver reliably. For example, enabling “Large Deflection” on a model with poorly constrained degrees of freedom may cause the solver to iterate to infinity. Using a direct solver (e.g., Sparse) on a model with billions of degrees of freedom will exhaust memory faster than an iterative solver. Requesting unrealistic time steps in a transient analysis can also lead to numerical overflow. Solution: Simplify the analysis first. Start with linear, static, small-deflection assumptions. Gradually add complexity while saving intermediate results.
Symptoms: The error occurs only with one specific simulation file. New projects solve fine. The error message says a diagnostic file was written
Why it happens: ANSYS Workbench databases (.mechdb) become corrupted after a crash or improper shutdown.
Fix:
When the error appears, a log file is generated. Navigate to the following directory to locate it:
C:\Users\<YourUsername>\AppData\Roaming\Ansys\vXXX\Workbench\logs\
(Note: vXXX corresponds to your ANSYS version, e.g., v221, v232). Once you have recovered from the crash, implement
Open the most recent log file. Look for lines containing Error, Exception, or Failed.
If the crash happens immediately when you open Workbench or view a model, it is usually a graphics driver conflict.
The error message says a diagnostic file was written. This file contains the specific reason for the crash.
Once you have recovered from the crash, implement these measures to avoid repeating the nightmare:
If this error occurs weekly: