Limits Verified — Ansys Your Product License Has Numerical Problem Size

Understanding the "Ansys Product License Numerical Problem Size Limits Verified" Message

If you are seeing the message "Ansys Your product license has numerical problem size limits verified" in your output file or solver console, you have encountered the built-in "governor" of an Ansys academic or entry-level license.

This isn't necessarily an error, but rather a confirmation that the software has checked your model size against the restrictions of your specific license tier. 1. Why Am I Seeing This?

Ansys offers various licensing tiers ranging from free student versions to high-end enterprise packages. To keep the student versions accessible, Ansys limits the complexity of the models you can solve.

When you initiate a solve, the software performs a Verification Check. It counts the number of nodes and elements (for FEA) or cells (for CFD). If the count is within the allowed range, it prints this message as a "pass" notification and begins the calculation. 2. Common License Limits

The limits depend heavily on which version of Ansys you are running. As of the most recent releases, the standard limits for Ansys Academic Student versions are: Structural (Ansys Mechanical): 128,000 nodes/elements. Fluid (Ansys Fluent / CFX): 512,000 cells/nodes.

Electromagnetics: Restrictions usually apply to the number of primitives or mesh complexity.

If you exceed these numbers, the solve will fail, and the message will change from "verified" to a "limit exceeded" error. 3. How to Manage Model Size

If you find yourself hitting these limits frequently, or if the "verified" message is a reminder that you are close to the ceiling, consider these optimization strategies: Use Symmetry

If your part is symmetric, don't model the whole thing. Using Symmetry Regions allows you to model half, a quarter, or an eighth of the geometry, effectively doubling or quadrupling your allowable mesh density. Simplify Geometry

Remove small fillets, rounds, or decorative features that don't impact the global physics. These features often "hog" elements by forcing the mesher to create tiny cells in insignificant areas. Use Shell and Beam Elements

Solid (3D) elements consume the node budget very quickly. Whenever possible, represent thin-walled structures with Shell elements and long, slender components with Beam elements. This can reduce your node count by 80–90% without sacrificing accuracy. Localized Inflation and Sizing

Instead of a fine global mesh, use a coarse global mesh and apply Local Sizing or Inflation Layers only where the gradients are high (like at a bolt hole or a wing's leading edge). 4. Moving Beyond the Limits

If your research or professional project requires a higher fidelity than the "verified" limits allow, you have three primary paths:

Academic Research License: If you are at a university, check if your lab has a "Research" license. These have much higher limits (often in the millions) or are completely "Unlimited." Scenario C: Electronics – DOF Matrix Caps

Ansys Learning Forum: If you believe your mesh is small but the error persists, the Ansys Learning Forum is the best place to post your project files for a license check.

Commercial Licensing: For professional work, moving to a Pro, Premium, or Enterprise license removes these numerical bottlenecks entirely.

Seeing the "numerical problem size limits verified" text means your license is working exactly as intended. It is a signal that your current model fits within the bounds of your specific software tier, allowing you to proceed with your simulation.

Troubleshooting: "Your Product License Has Numerical Problem Size Limits Verified"

When you encounter the error message "Your product license has numerical problem size limits, you have exceeded these problem size limits and the solver cannot proceed," it means your current Ansys license (typically the free Student Version or a specific University License) has a cap on the number of nodes or elements your model can contain.

The solver "verifies" this size before it begins calculating. If the count exceeds the predefined threshold, the simulation is blocked to ensure compliance with the license agreement. Standard License Limits

Limits vary by physics and version, but general caps for the Ansys Student version are: Structural Physics: 128,000 nodes/elements. Fluid Physics (Fluent): 512,000 cells/nodes. Ansys Motion: 100,000 nodes per flexible body. Step-by-Step Resolution Guide

Follow these steps to diagnose and bypass the numerical limit error. 1. Check Your Current Mesh Statistics

Before making changes, confirm how far you are over the limit. In the Outline tree, select the Mesh branch. In the Details window, expand the Statistics section. Check the total number of Nodes and Elements.

Note: Hidden elements like Contact Elements, SURF elements for loads, or Weak Springs also count toward the total, even if they aren't visible in the mesh statistics. 2. Compress and Renumber Node IDs

Sometimes the total node count is fine, but a specific Node ID exceeds the limit (e.g., a node labeled #33,000 when the limit is 32,000). Right-click on Model and select Insert > Mesh Numbering. Set Compress Node Numbers to Yes. Right-click on Mesh Numbering and select Renumber Mesh. 3. Use Symmetry to Reduce Model Size

If your geometry and loading are symmetric, you can simulate a fraction of the model to stay under the limit.

Split the geometry in SpaceClaim or Discovery (e.g., into a half or quarter model).

Apply Symmetry Boundary Conditions to the cut faces. This effectively doubles or quadruples your allowable mesh density for the same node count. 4. Simplify Geometry and Mesh Controls Example: A phased array antenna simulation in HFSS

Reduce the complexity of the model to lower the cell count naturally.

Midsurface Extraction: Convert thin solids into Shell Elements using the "Midsurface" tool in SpaceClaim. Shells use significantly fewer nodes than 3D solid elements.

Global Sizing: Increase the Element Size in Mesh details to coarsen the mesh.

Local Refinement: Use Mesh Sizing controls to keep a fine mesh only in critical areas (like stress concentrations) and a coarse mesh elsewhere.

Linear Elements: Change the Element Order from Quadratic to Linear. This reduces the number of mid-side nodes, drastically lowering the total node count. 5. Reset the Solver Cell (If Limit was Previously Exceeded)

This error message typically appears in Ansys products (like Fluent, CFD, or Mechanical) when the license manager detects that the problem you are trying to solve requires more resources (cells, nodes, or equations) than your specific license type permits.

Here is a useful guide on how to interpret, troubleshoot, and resolve this error.

Scenario C: Electronics – DOF Matrix Caps

5. Convert to "Solver Mode" (CFX Only)

In CFX, you can run the solver separately from the pre-processor. The license check occurs at solver start—using a different feature set may allow larger sizes.

Test with a Known Small Model:

Run a 1000-node model. If that passes, your license works. The problem is purely model size. If even a small model fails, the license itself is corrupted or the feature is missing.

Conclusion: Taking Control of the “Numerical Problem Size Limits Verified” Warning

Seeing “ansys your product license has numerical problem size limits verified” is not the end of your simulation—it is a signal. It tells you that you have outgrown the boundaries of your current license tier or that you need to refine your meshing strategy.

Immediate action items:

  1. Identify your license’s exact node/cell limit using lmstat or the solver log.
  2. Coarsen the mesh or apply symmetry to fit within the cap.
  3. Force checkout of a higher-tier license via Preferences.
  4. Consider submodelling or domain decomposition.
  5. If cost-effective, upgrade to an Enterprise license for unlimited problem size.

Remember, the “verified” term means the license manager has checked and confirms a mismatch. It is not a bug—it is a feature designed to enforce commercial boundaries. By understanding these boundaries, you can either work creatively within them or make a data-driven case to management for a license upgrade.

Have you encountered this warning with a specific license type? Leave a comment below or contact your Ansys support channel for size limit exceptions.

This error occurs when your model's node or element count exceeds the capacity allowed by your specific Ansys license, a common restriction in free student and introductory academic versions. Standard License Limits a knowledge base article

The limits vary significantly depending on the physics being simulated and the version of the software:

Structural & Thermal Physics: Typically limited to 32,000 nodes/elements.

Fluid Dynamics (CFD): Generally capped at 512,000 nodes/cells, though some newer versions (like 2025 R1) may allow up to 1 million cells.

Academic Versions: Limits can vary from 16k to 512k nodes depending on whether the license is "Introductory," "Intermediate," or "Research". Why It Might Fail Even If Your Count Is Low

Sometimes the error appears even when you are technically under the limit. This is often due to Node ID fragmentation:

The Highest ID Problem: Some licenses check the highest node ID rather than just the total count. If you have 1,000 nodes but one is numbered "40,000," the solver may fail.

Hidden Connection Elements: Boundary conditions, remote loads, or moments can add "hidden" connection elements to the total count at the start of a solve, pushing a "borderline" model over the limit. How to Resolve the Error

Renumber Mesh Nodes: This is the most effective fix for high ID numbers. Right-click on Model > Insert > Mesh Numbering. Set Compress Node Numbers to Yes. Right-click Mesh Numbering and select Renumber Mesh.

Simplify Geometry: Use midsurfaces to convert solid bodies into shell elements or use beam elements for thin supports. This drastically reduces node counts compared to 3D solid meshing.

Apply Symmetry: If your part is symmetrical, simulate only a half or quarter of it and use Symmetry Boundary Conditions to keep the mesh size within limits.

Reduce Mesh Density: Use Local Mesh Sizing to keep high detail only in critical areas and coarsen the mesh elsewhere.

Project Maintenance: If a model fails once, the error can sometimes "stick" in the Setup cell. Try duplicating the Model cell and creating a fresh Setup cell to reset the license check. Your product license has numerical problem size limits…..

Here’s a clear, informative content piece explaining how ANSYS enforces numerical problem size limits based on your product license. You can use this for internal documentation, a knowledge base article, or a team notification.