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Performing a Mesh Refinement Study and Using Selections and Variables

Part 2 of this 5-part course on electro-thermal-mechanical modeling in COMSOL Multiphysics^® builds upon the previous video by using the electrical problem for the model of a chip that was introduced and solved for in the first part of this course. With this electric currents model of the chip, we use integration to extract numerical data and investigate the mesh refinement of the model, which is an important step in building any finite element model in order to verify the results. Then we expand the model by adding another physics, heat transfer, and solve for the temperature field within the bond wires of the model. As a result, our initial single-physics model becomes a multiphysics model. We then use coordinate-based and Boolean selections to define the thermal boundary conditions that prescribe temperature and radiation, and also approximate free convection.