Ansys Your Product License Has Numerical Problem Size Limits Verified
In simple terms, numerical problem size refers to the number of degrees of freedom (DOFs) in your simulation.
When Ansys says your license has a “verified limit,” it means your current license token only permits simulations up to a certain DOF count.
License Feature: ansys
Maximum DOFs allowed by license: 128000
Current model DOFs: 112500 -> OK
If exceeded:
License Feature: ansys_prof
Maximum DOFs allowed by license: 32000
Current model DOFs: 45000 -> ERROR: License limit exceeded.
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 In simple terms, numerical problem size refers to
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
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)
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. When Ansys says your license has a “verified
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: ensure accurate results
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.
This is a common paradox. You may have solved a 1M node model last week, but today you get the “limits verified” error on a 600k node model. The reasons include:
If you recently renewed your license or installed a new version of Ansys, the error might be due to an outdated license file (license.lic or ansyslmd.lic).