When you consider analytical solutions to heat transfer in welding with (for example) the source term as a double-ellipsoidal, sometimes one coordinate have the "-vt" and the heat equation in unmodified. But sometimes the heat equation is modified to include a flow term coming from a transformation due to a moving solid model. What is the correct approach? I believe that this has to do with the frame of reference, one moving with the source and the other fixed, but I am not sure. Can anyone help me?
The crude models I've done considered it a moving source. The models and simulations I've seen others do in the past also considered it a moving heat source as well. Hope this helps some.
Hi, that depends on your case. E.g. if you are interested in residual stresses one usually uses a moving heat source as you need the distribution of temperature and its temporal change on the whole domain. Otherwise if you are looking into the flow behavior the heat source can be modeled stationary on a fixed grid and the material is moved instead. So you are right, it depends on the reference frame.
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