problem description
title="Heat Transfer Sample Problem" nodes=4 elements=2 analysis=static-thermal

nodes
1 	x=0	y=0	constraint=insulated
2	x=2		constraint=free
3	x=2	y=2	
4	x=0		constraint=insulated

ctg elements
1	nodes=[1,3,4]	material=steel
2	nodes=[1,2,3]			load=convection

material properties
steel 	Kx=25 Ky=25 t=1

distributed loads
convection	values=(2,20) (3,50)

constraints
insulated	Tx=100
free		Tx=u

end
