So the laser is just heating the tip of the tooth? Volumetric heat generation doesn't seem like an appropriate way to model the surface heating of a laser. If you create a very fine mesh of the tooth tip area you could select nodes on the surface based on their theta coordinate in a cylindrical system. You could update the theta values over time:
csys,1Â Â ! global cylindricalÂ
nsel,s,ext ! nodes on the surface
nsel,r,loc,x,mid_tooth,top_tooth+increment
nsel,r,loc,y,theta,theta+small_angle ! needs to select at least two nodes for a face to be defined
sf,all,hflux,value
allsel
time,...
solve
reselect
next timeÂ
solve
soo
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