Simcenter 3D Solutions Resolving Warning 4410: Troubleshooting iterative heat flux convergence issues
Summary
The article addresses Warning 4410, which occurs when the iterative heat flux calculation method fails to converge in thermal simulations and provides a guide for identifying and resolving the underlying issues.
Details
The following warning arises when the iterative heat flux calculation in a simulation does not converge, often due to bad view factor sums or incomplete enclosures.
This warning indicates that some energy couldn't be absorbed by elements within the enclosure and was instead redistributed to all elements. If this unabsorbed energy fraction is minor compared to the overall energy fluxes, it may be acceptable. However, to ensure accuracy, it's important to fix any issues in the model.
One common issue, indicated by Warning 4316, involves low view factor (VF) sums.
These low sums often point to problematic elements affecting radiation calculations. Closely examine the elements flagged by Warning 4316 and correct any inaccuracies. To view these elements, import the group.unv file by selecting File → Import→ Simulation, choosing Simcenter 3D Thermal/Flow. From the File Type, select Solution Error/Warning Groups.
You can also increase the maximum number of iterations by adjusting the advanced parameter "POWER MODULE ITERATIVE SOLVER PARAMETER" (default set to 30) to improve convergence.
However, the most effective solution is to correct the underlying model issues to prevent these warnings from occurring.