Fundamentals of Modeling Moving Parts for Resistive and Capacitive Devices
In the final part of our 10-part course, which gives an introduction to modeling resistive and capacitive devices, you will learn about modeling moving parts. The example we use throughout the lecture is a variation of a model worked with previously in the course that involves Joule heating. The geometry consists of a part with an inclusion in it and an electrode sitting on top of the inclusion at the center, with the electrode being the part moved around.
After building the geometry, we discuss how and why the use of theForm Assemblygeometry finalization method, along withIdentity Boundary Pairs, are required in order to simulate this movement. To ensure continuity of fields, such as the electric current across the pair boundaries, we add aContinuitynode from thePairsmenu. At that time, we also introduce you to the various types of features you can apply to boundary pairs under theElectric Currentsinterface.
We then continue with setting up, computing, and verifying the electrical part of our model before addressing the heat transfer part of our model, wherein we similarly add aContinuitynode to enforce continuity of the fields, such as the temperature and heat flux across the pair boundaries. We then introduce you toFallback Featuresand discuss how and when you can add these features to aContinuitynode. Upon computing the model, we perform additional postprocessing to verify our results for the heat transfer. Stationary studies have been computed thus far up to this point.
Now that the preparatory steps for simulating movement have been completed, we can model the copper electrode moving around over time using theMoving Meshcapabilities, such as thePrescribed Deformationfeature and by adding a newTime Dependentstudy. We also briefly discuss the selection of frames for visualizing the movement.
Lastly, we end with demonstrating how to model a different kind of motion, this time where the electrode comes into contact and presses into the inclusion material. This is accomplished through adding theSolid Mechanicsinterface, modifying the geometry so the parts start out of contact, defining aContact Pair, modifying the mesh to minimize the number of elements in the geometry except where needed, defining and then adding aRampfunction to thePrescribed Deformationfeature, and finally adding aContactfeature to theSolid Mechanicsinterface.
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