http://www.comsol.com/community/forums/general/thread/34531/ Most recent forum messages Sun, 03 Feb 2013 15:46:34 +0000 http://www.comsol.com/shared/images/logos/comsol_logo.gif http://www.comsol.com/community/forums/general/thread/34531/ http://www.comsol.com/community/forums/general/thread/34531/#p95051 Hi<br /> <br /> if you have a transient solver you can define a function (Model - Definitions - Functions) that depends on the time. If the area is constant you need only to multiply the Heat source flux / power density value by the time, appropriately, but if your surface heating is also expanding with time, you might use a Gaussin function over the coordiates that depends on time. <br /> Note COMSOL has a particular way to normlaise it's default Gaussian function, it's in the help but today, you must still do a search over the help to find the correcct formula<br /> <br /> --<br /> Good luck<br /> Ivar Sun, 03 Feb 2013 15:46:34 +0000 34531.1359906394.95051 http://www.comsol.com/community/forums/general/thread/34531/#p95047 I have a model for EDM process in which I need to put an heat source which would be expanding with time. But it shows error if I give time dependent position of a point under boundary conditions. Laser example shows a moving heat source but how can I build a heat source expanding with time???<br /> <br /> Thanks Sun, 03 Feb 2013 13:25:47 +0000 34531.1359897947.95047