COMSOL+Heat Transfer
Hi guys,
I found this forum by chance. Was wondering if anyone could help out with my problem. I am very new to this COMSOL and I am required to tackle a problem. I am required to simulate laser drilling onto a material using comsol to obtain the heat transfer pattern. I have chosen silicon in the dropdown box I used the New>FEM>Heat Transfer>Conduction>Transient Analysis. I then created a rectangle with 3 sides thermally insulated and the top is having heat flux. Under Boundary settings, I need to enter the equation in the Q field as the heat source The equation is like this: (10^7) x exponential (10^3 x X^2) for a time of 2 seconds. I keep having syntax errors. How do I put in the equation properly? Thanks. 
Re: COMSOL+Heat Transfer
Hi Skyeagle,
Comsol syntax is pretty much identical to that of Matlab (well they share plenty of history) ..... so for your equation you might try something like: (10^7)*exp((10^3)*x^2)*(t<=2) I'm assuming what you're after with the "x" is a cartesian coordinate (or that is how comsol would interpret from the above)? The "t<=2" evaluates as "1" for t <=2 (assuming your t is in seconds) and 0 otherwise (you can do the same thing with a simple "if"  construct or use several of the other available step  function  lookalikes, if you for example wish to smoothen the transition to 0 value). 
Re: COMSOL+Heat Transfer
PerennialII ,
Thanks for the reply. yup. I got the waveform as per the syntax that you have given. Right now I need to generate the temperature profile which I am facing some problem. Its not what I am expecting. 
Re: COMSOL+Heat Transfer
Yeah, these often take surprising chunks of time to get them working. Let me know if can try to come up with further pointers.

Re: COMSOL+Heat Transfer
If you like I can help you out with a simulation in Ansys. Let me know if you want my help.

Re: COMSOL+Heat Transfer
hi, im dont no nothing about COMSOL, apart from the using a user guid to make a model and plot a graph.. what i wish to achieve is a wire ( rectangle ) which gives heat at one end and over time the heat eventually transfers over to the other.
Thanks kenn 
Re: COMSOL+Heat Transfer
i think you cn try with the heat transfer using the conduction model to do this....try using tat and contact if u have any doubt

Re: COMSOL+Heat Transfer
as a complete novis to this software, could you explain to me in a step by step process how to achive a model of heat flow from one end of a wire to another? i would reli appreciate this, as well as a stress flow model aswell (where one end increases in tensile stress and the other end increases in compressive stress), many thanks

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