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.

Scenario C: Nonlinear or Transient Steps

In a static analysis, you might be under the limit. However, a nonlinear transient analysis with 50 time steps and 10 substeps per step multiplies the effective problem size. ANSYS counts the peak numerical problem size, not the average.

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

After each reduction, check the solver output window for the elusive *** NOTE *** message that confirms the license limit and the current problem size.

Scenario A: Structural Analysis – “Too Many Nodes”

• Example: Performing a detailed mesh convergence study on a turbine blade with 1.2 million nodes. The license (Mechanical Pro) has a 512k node limit.
• Warning appears at: Start of solution or during "Check License" preprocessing.

Part 2: Why Does ANSYS Impose Numerical Problem Size Limits?

Not all ANSYS licenses are equal. The company deliberately scales feature access and computational capacity to match different user needs and price points. The "numerical problem size limits" exist for three primary reasons: