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Transient Analysis of Radiofrequency Ablation

Transient Analysis of Radiofrequency Ablation

Transient Analysis of Radiofrequency Ablation

(OP)
Hey Everyone,

I'm trying to model radiofrequency ablation (RFA) using ANSYS transient analysis.  For those of you who do not know about RFA, it is a process used to kill unwanted tissue in the heart and liver.  The tissue surrounding a heated probe is killed via thermal conduction and thus forms a lesion surrounding the probe tip.

I have modeled the geometry and meshed it, but I can't seem to get the analysis to run the way I know it should (it's been done by students who graduated before me and my results look nothing like theirs).  The probe tip is a thin rectangle in the center of a large meshed square.  I want to apply a constant temperature to the sides and bottom of this rectangle, and see the temperature distribution in the surrounding tissue over different time periods.  I have so far tried to simply apply the temperature to the lines of the probe tip, but the lesion created doesn't seem to be a product of lenghty heating, rather just a short period of time (my lesion for 200 seconds is EXACTLY the same as that for 1000 seconds).  Can anyone help me define the loads?  The tutorials I have seen that use the table method or the load step method are not thorough enough, and I can't seem to get it working.

Again, I want to apply a constant temperature to 3 lines of a rectangle embedded in a large square, and see the temperature distributions resulting from thermal conduction over time.  I hope someone can help! I need to get this working ASAP, because I have a large paper due at the end of the semester and I won't have anything to write on if I don't get this working!  Thanks!

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