simple start for optimizing cad for minimizing heat flux
PPPL GSS presentation: https://github.com/ctychen/simpleopt/blob/main/optimages/cchen_pppl_poster_revfinal.pdf
Cube rotation demo: https://github.com/ctychen/simpleopt/tree/cuberotationdemo
Pyramid mesh demo: https://github.com/ctychen/simpleopt/tree/pyramiddemo
3 1D gradient, test009_7: https://github.com/ctychen/simpleopt/tree/hfopt-0626-bookmarked
1 3D gradient, test009_13: https://github.com/ctychen/simpleopt/tree/simple-hfopt-v5
