The “numerical problem size limits verified” error isn’t a bug—it’s a license checkpoint. Understanding it saves hours of debugging.
Next time you see it: Check your mesh size → Compare to your license tier → Coarsen, symmetrize, or upgrade.
Have you encountered a weird DOF limit that didn’t make sense? Share your experience in the comments below—chances are, someone else has solved it.
Need help reading your Ansys license file? Drop us a line or check our license optimization guide.
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
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…..
Sure — here are three concise post options you can use (short, medium, and detailed). Pick one or edit as needed.
Short "ANSYS: Your product license has numerical problem size limits verified."
Medium "Error from ANSYS: 'Your product license has numerical problem size limits verified.' Has anyone seen this? I'm trying to run a larger model and ANSYS is stopping with this license-related limit message. What does it mean and how can I increase the allowed problem size?"
Detailed (includes context + request for help) "I'm receiving this ANSYS message: 'Your product license has numerical problem size limits verified.' It appears when I try to solve a model with ~[insert DOF/mesh size] and prevents the run from completing. Environment: ANSYS [version], solver: [Mechanical/Fluent/etc.], license type: [flexlm/ENTITLEMENT]. I tried restarting the license server and verifying license features, but the simulation still hits a limit. Has anyone encountered this and resolved it? Looking for:
If you tell me which forum/platform you’ll post on (LinkedIn, Reddit, support ticket) and your ANSYS version + solver + approximate model size, I can tailor tone and add tags/subject line.
The error message “ANSYS Your product license has numerical problem size limits verified” is intimidating, but it is not a dead end. It is a precise, informative signal from the software that you have reached a contractual boundary. By understanding the meaning of "verified," identifying your exact license type, and applying systematic model reduction or license upgrades, you can overcome this barrier.
Remember: This warning is a sign of growth. Your simulation fidelity is outgrowing your current license tier—which is exactly the moment to either refine your modeling discipline or invest in greater capacity. Do not fear the message; decode it, solve it, and get back to breakthrough engineering.
Next Steps: Run ans_licinfo now. Check your current limits. Document them for your team. And the next time anyone in your organization sees that warning, you will be the expert who explains why “verified” is the most important word in the sentence.
This article is for informational purposes. License limits are subject to ANSYS, Inc. terms and conditions. Always refer to your specific license agreement and contact ANSYS support or your authorized reseller for definitive guidance.
This message indicates that your Ansys Student or Academic license has restricted the number of nodes or elements you can solve. When your model exceeds these pre-defined limits, the solver is programmed to stop before the simulation begins. Standard License Limits
For most Ansys Student versions, the common numerical limits are:
Structural Physics: 32,000 nodes and elements combined. Some newer versions may allow up to 128,000.
Fluid Physics (CFD): 512,000 cells and nodes combined. Recent updates may support up to 1,000,000 cells. Electromagnetics (Maxwell): 64,000 elements for 3D volume. Why the Error Appears (Even if Mesh Looks Small)
Even if your displayed mesh count is below the limit, the error can trigger due to: Your product license has numerical problem size limits…..
This specific error message is a rite of passage for almost every engineering student using the Ansys Student version. It occurs when your simulation mesh—the digital "grid" that breaks your model into tiny pieces for calculation—contains more nodes or elements than the free license allows.
Here is a short story of an engineering student facing this exact wall. The Midnight Mesh
Leo sat hunched over his laptop at 2:00 AM, the blue light reflecting off his glasses. He was finishing his final project: a stress analysis on a custom-designed car jack. He had spent hours in SpaceClaim refining the geometry until it was perfect—every bolt, every chamfer, and every small fillet was meticulously modeled.
He opened the Mechanical window and hit "Generate Mesh." The progress bar crawled across the screen. When it finished, the model looked beautiful, covered in a fine, dense web of silver lines. Leo felt a surge of pride. This wasn't just a simulation; it was art. He clicked Solve. Need help reading your Ansys license file
He waited. Instead of the satisfying green progress bar of a running solver, a sharp, red error message popped up:
"Your product license has numerical problem size limits, you have exceeded these problem size limits and the solver cannot proceed."
Leo’s heart sank. He checked his mesh statistics. He had 150,000 nodes. For his structural analysis, the Ansys Student limit was strictly 128,000 nodes/elements. He was "too good" for the free license.
Desperate, he tried to "renumber" the nodes or restart the software, hoping it was a glitch. No luck. The license manager had "verified" the size, and it was a hard wall. Ansys Student - Engineering Information Technology
The error message "your product license has numerical problem size limits" is a hard cap enforced by Ansys on its academic and free student software packages. This limit restricts the complexity of simulations by capping the number of nodes and elements allowed in a single model. Core License Limits
The specific limits vary depending on the physics environment and the type of academic license being used. Physics Type Ansys Free Student Limit Higher Academic Tiers (e.g., Research) Structural (Mechanical) 32,000 nodes/elements Up to 512,000 nodes Fluids (CFD/Fluent) 512,000 nodes/cells No limit (on full licenses) Electromagnetics Specific limits vary by version Scaled based on license tier Common "Hidden" Triggers
Even if your visible mesh count is below the limit, the solver may still block you due to: Your product license has numerical problem size limits…..
Whether you're a student pushing the boundaries of a free license or a researcher managing university seats, the error
"Your product license has numerical problem size limits verified" is a classic roadblock in
. It essentially means your model’s complexity has outgrown your license's predefined capacity.
Here is a blog post guide to understanding, diagnosing, and fixing this limitation.
Decoding the Error: "Your Product License Has Numerical Problem Size Limits"
If you’ve just hit "Solve" only to be greeted by a license limit error, don't worry—you haven't broken the software. This message is Ansys’s way of saying your mesh is too "expensive" for the license key you are currently using. 1. Why Am I Seeing This? Most often, this happens because you are using an Ansys Student
license. These versions are designed for learning and small-scale projects, so they come with hard caps on how many "pieces" (nodes and elements) your simulation can have. Standard Limits for Ansys Student (v2023/2024): Structural (Mechanical):
128,000 nodes/elements. (Note: Older versions were limited to 32k). Fluid Dynamics (Fluent):
512,000 cells/nodes. (Newer versions may allow up to 1 million). 2. The Hidden "Trap": Why Your Small Model Failed
Sometimes you check your mesh and see 30,000 nodes—well under the 128,000 limit—yet it fails. Why? Contact Elements:
In Mechanical, the solver creates "contact elements" at runtime to handle interactions between parts. These are invisible in your initial mesh count but toward the license limit. The "Ghost" Limit:
If you once exceeded the limit and then reduced your mesh, Ansys sometimes "remembers" the failure. A common workaround is to Update Geometry from Source
or duplicate the Model cell to a new Setup cell to reset the license check. Node ID Limits: In some cases, the error isn't the
count, but the highest Node ID. If you have gaps in your numbering, use the Compress Node Numbers tool in the Mesh Numbering menu. 3. How to Fix It (Without Buying a New License)
Before reaching for your wallet, try these optimization techniques to shrink your problem size: Symmetry is Your Friend:
If your part is symmetrical, simulate only half (or a quarter) of it. This can instantly cut your node count by 50–75%. Use Shells and Beams:
Don't use 3D "Solid" elements for thin sheets or long wires. Converting a thin plate to a
model can reduce node counts from thousands to hundreds with better accuracy. Local Refinement:
Instead of a fine mesh everywhere, use a coarse global mesh and apply a Sphere of Influence Local Sizing only where the stress is highest. Linear vs. Quadratic:
Quadratic elements (higher order) are more accurate but use more "space." If you are just testing a concept, switching to Linear elements can help you stay under the cap.
Understanding the "Your Product License Has Numerical Problem Size Limits" Error in ANSYS
If you are working on a complex simulation and suddenly see the message "Your product license has numerical problem size limits," you’ve hit a structural wall in your workflow. This error isn’t a bug; it is a built-in restriction based on the specific license tier you are using. 1. Why Does This Error Occur?
ANSYS scales its software capabilities based on the license type. This error typically triggers when your model's mesh density (the number of nodes and elements) exceeds the maximum allowed by your current seat. It is most common in two scenarios:
The Student/Academic Version: Designed for learning, these free versions have hard caps on model complexity.
Lower-Tier Commercial Licenses: Some entry-level commercial packages limit the "Problem Size" to keep costs lower for small-scale engineering tasks. 2. Verified Problem Size Limits
While limits can change with software updates (e.g., from version 2023 R1 to 2024 R2), the standard limits for the ANSYS Student Edition generally remain consistent: Structural Physics (Mechanical): 128k nodes/elements. Fluid Physics (Fluent/CFX): 512k cells/nodes.
Electromagnetics: Limits often apply to the number of objects or the mesh density depending on the specific solver (HFSS vs. Maxwell). If you tell me which forum/platform you’ll post
If you are using a Commercial license (like ANSYS Pro or Premium) and see this, you may be attempting a high-fidelity simulation that requires an ANSYS Enterprise license or additional HPC (High-Performance Computing) packs. 3. How to Verify Your Current Limits
To confirm exactly what your license allows, follow these steps:
Check the License Manager: Open the ANSYS License Management Center. Under the "View Status" or "License File" tabs, you can see the specific features (increments) enabled.
In ANSYS Mechanical: Look at the "Statistics" tab under the Mesh branch in the project tree. This shows your current Node and Element count. If this number exceeds 128,000 on a Student version, the solver will refuse to run.
Check the Output File: When the solver fails, open the .out or .log file. It will explicitly state: "The number of nodes [X] exceeds the maximum limit of [Y]." 4. How to Fix the Error
If you cannot upgrade your license immediately, you must optimize your model to fit within the "Problem Size" constraints:
Symmetry: Use 1/2 or 1/4 symmetry (Symmetry Regions) to reduce the model size by half or more while maintaining the same mesh density.
Mesh Refinement: Instead of a global fine mesh, use Local Mesh Sizing. Keep the mesh coarse in non-critical areas and fine only where stresses or gradients are high.
Simplify Geometry: Remove small fillets, holes, or decorative features that force the mesher to create unnecessary elements.
Element Types: In structural shells, switching from higher-order (quadratic) elements to lower-order (linear) elements significantly reduces node count, though it may impact accuracy. 5. Moving Beyond the Limits
If your project requires high fidelity that exceeds these limits, your options are:
Academic Researchers: Ensure you are using the Research license provided by your university, not the Student download.
Commercial Users: Contact your ANSYS channel partner to discuss an upgrade to a higher tier or to add HPC Packs which unlock larger solve capabilities.
Are you currently working on a structural or fluids project, and do you know your current node count?
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."
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.
Verifying Numerical Problem Size Limits for ANSYS: A Comprehensive Guide
As a leading provider of engineering simulation software, ANSYS has established itself as a gold standard in the industry. With a wide range of tools and features, ANSYS enables engineers and researchers to simulate and analyze complex systems, from simple mechanical components to intricate multiphysics phenomena. However, as with any software, ANSYS is not immune to limitations, particularly when it comes to problem size. but avoids GUI overhead).
In this article, we will explore the numerical problem size limits associated with ANSYS, discuss their implications, and provide guidance on verifying and mitigating these limitations.
Understanding ANSYS Licensing and Problem Size Limits
ANSYS offers various licensing options to cater to different user needs, including:
While these licensing options provide flexibility, they also come with numerical problem size limits. These limits are designed to prevent excessive usage and ensure fair access to the software. The limits are typically defined by the number of:
Verifying Problem Size Limits
To verify the numerical problem size limits for your ANSYS license, follow these steps:
Common Numerical Problem Size Limits
Here are some common numerical problem size limits associated with ANSYS licenses:
Implications of Exceeding Problem Size Limits
If you exceed the numerical problem size limits associated with your ANSYS license, you may encounter:
Mitigating Problem Size Limits
To mitigate the numerical problem size limits associated with your ANSYS license:
Best Practices for Managing Problem Size Limits
To effectively manage numerical problem size limits in ANSYS:
Conclusion
Numerical problem size limits are an essential consideration when working with ANSYS software. Understanding these limits and their implications can help you optimize your simulations, ensure accurate results, and make the most of your ANSYS license. By verifying your license's problem size limits, following best practices, and exploring mitigation strategies, you can efficiently and effectively utilize ANSYS software for your engineering simulation needs.
References
By following the guidelines and best practices outlined in this article, you can ensure that you are using ANSYS software efficiently and effectively, while also maximizing the value of your investment.
The message " Your product license has numerical problem size limits verified
" appears in Ansys when the software confirms that you are using a version—typically the Ansys Student
edition—that restricts the complexity of simulations you can run. This is not a "bug" but a built-in constraint of the license tier. Core Limits by Physics These limits represent the maximum allowable total count of nodes and elements (or cells) in your mesh: Structural (Mechanical): Typically limited to 32,000 nodes and elements Fluid Dynamics (CFD/Fluent): Typically limited to 512,000 cells/nodes . Some newer versions may allow up to 1 million cells. Electronics Desktop: Restricted to 64,000 3D volume elements HPC (Parallel Processing): Student versions are often capped at 4 to 16 cores Immediate Fixes & Workarounds
If you encounter this error while trying to solve, you must reduce the model's complexity to fit within the license window: Ansys Student - Engineering Information Technology
The error message "Your product license has numerical problem size limits verified" typically appears when a simulation model exceeds the hard constraints of a non-commercial Ansys license. This most commonly affects users of Ansys Student or Academic versions, where the software restricts the complexity of models to ensure the free version is used for educational purposes rather than professional-grade production. Core Limits by License Type
License limits are primarily based on Node and Element (or cell) counts. Once your mesh statistics cross these thresholds, the solver will refuse to proceed.
Here’s a useful response you can use (e.g., in an email, support ticket, or internal note) when dealing with ANSYS license limits related to problem size:
Subject: ANSYS License Numerical Problem Size Limits – Verified & Action Steps
After verification, your current ANSYS license imposes numerical limits on problem size (e.g., number of nodes/elements, DOF, or contact pairs). Once these limits are exceeded, the solver may:
Common limits by license type (examples):
What to do next:
To permanently resolve recurring limit issues:
Contact your ANSYS reseller to request a license feature upgrade (e.g., HPC Pack, larger problem size caps, or unlimited nodes).
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.
Sometimes the interface enforces a stricter check than the solver. Try launching the solver directly:
fluent 3ddp -g -t4 -i journal.jou
Or for Mechanical:
ansysXX -dis -b -m 4 -i input.dat -o output.out
The batch flag (-b) sometimes bypasses immediate size verification (not a full bypass, but avoids GUI overhead).