Electronics systems are used in almost every industry including automotive, aerospace, defense, computers and storage devices, and consumer electronics. The challenges however are many and the fast pace in their development makes CAE important in the efforts to design new products while same time reducing the designing cycle. Electronics systems need to have increased sustainability and function under harsh and rapidly changing conditions such as those in automobiles where humidity and significant variations in temperature take place. Moreover the increased power density requires analytical studies on thermal flows in electronic devices. The complexity of the designs in products poses additional challenges while the multiple load types that these devices must endure makes simulations vital.