Resolving Length-Scale Disparity Using Non-Conformal Meshing

Challenges of Length-Scale Disparities
Traditional Methods of Resolving Length-Scale Disparities
Basics of Non-Conformal Meshing
Modeling PBGA Package
Modeling PBGA Package & Heat Sink
Modeling PCB-Heat Sink Assembly
Conclusions
Electronic packages contain components with large length-scale disparities
Lengths can vary by several orders of magnitude
Examples include:
Package-PCB assembly
Heat sink-system assembly
Difficulties with large disparity in length-scale:
Mesh count becomes large
Need large computer resources
Model may not be solved without serious approximations
Time-to-solution is longer
Poor mesh aspect ratio and face alignment
Convergence difficulties
Accuracy problems