July 9, 2019 at 5:01 am
DrAmine
Ansys Employee
Based on some investigation we do not recommend the spectral synthesizer.
Random fluctuations will depend on TI as states in the documentation.

Regarding your case with no perturbations please create custom field function and calculate the quantity you want to quantify. RMSE only refer to resolved stresses. To build up TI one requires the whole stress.