Hello, I am looking to apply to heat equation to a cylindrical rod and solving with explicit finite difference scheme. I have never worked with cylindrical coordinates before, what would be the best way to model this? I am having a hard time understanding the advantage of using cylindrical. Isn't it the same as if I "unrolled" it and took the problem as either a 2-D or 3-D planar geometry with the same surface area? Does anyone have any sample code I can see on how to implement?