Autodesk Moldflow Error 99998 Best Link

Autodesk Moldflow Error 99998: The Best Guide to Causes, Solutions, and Prevention

If you are a plastics engineer or mold designer, few things are as frustrating as a simulation crashing right before a critical deadline. Among the pantheon of Autodesk Moldflow solver errors, Error 99998 is one of the most notorious. Often accompanied by a vague message like “Solver terminated due to numerical problems” or “Unexpected internal error,” this code brings your analysis to a screeching halt.

But what is the best way to fix Error 99998? This article provides the definitive, step-by-step guide to diagnosing, resolving, and preventing this issue permanently. autodesk moldflow error 99998 best

7. Preventive Best Practices

• Early geometry cleanup in CAD before meshing.
• Use mesh controls targeted to thin features, not global small sizes.
• Validate material databases and unit consistency on import.
• Start with filling-only runs for new models.
• Keep Moldflow updated and document solver settings for reproducibility.

Step 2 – Clean temporary files

• Delete contents of:
  • C:\Users\[YourName]\AppData\Local\Temp\moldflow_*
  • Study folder → study_name_temp subfolder.
• Restart Moldflow.

Step 3 – Switch analysis type temporarily

• Change from Cool + Fill + Pack to Fill only.
• If Fill runs: Error relates to cooling solver (check coolant circuit or mesh penetration).

9. Community Forums

• Autodesk Community Forums: These can be a valuable resource for finding solutions to specific problems, as other users may have encountered and resolved the same issue.

Step 3: The "Clean Slate" Procedure

Corrupt database files are a silent killer. Autodesk Moldflow Error 99998: The Best Guide to

1. Create a new study.
2. Export the mesh as a Patran or Nastran file (.nas or .out).
3. Import that mesh into the new study.
4. Re-apply materials and conditions.

• Review Verdict: This resolves roughly 30% of 99998 errors caused by database corruption.

Step 2: Simplify the Analysis Sequence

If the mesh looks clean, the solver may be overwhelmed by complexity. Early geometry cleanup in CAD before meshing

• Change analysis type: Temporarily switch from Cool + Fill + Pack + Warp to Fill Only. If Error 99998 disappears, the issue is packing or warpage.
• Disable fiber orientation: In Process Settings > Advanced Options, uncheck “Fiber orientation analysis” and “Residual stress calculation.” Run again.