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Heat Source Expanding with time!

Posted Feb 3, 2013, 9:25 a.m. EST Heat Transfer & Phase Change, Geometry Version 4.3a 1 Reply

Kushan Gajjar
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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???

Thanks
1 Reply Last Post Feb 3, 2013, 11:46 a.m. EST
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago Feb 3, 2013, 11:46 a.m. EST
Hi

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.
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

--
Good luck
Ivar
Hi 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. 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 -- Good luck Ivar

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