semi infinite geometry with a radiating source

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I'm really new in Comsol. I'd like to verify with Comsol this problem:

I have a semi-infinite domain (say a soil) in the xy plane (with y pointing downward, and x as usual). The soil is in contact with the air (for y<0). Anywhere on the soil, I have a radiating source . I suppose that the isothermal surfaces generated by the source are seen, by an observer located at , as semi-circles.

My professor asks to plot this geometry, and plot the isothermal surfaces to verify the hypothesis.

Can anyone guide me?



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