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Temperature distribution in a Cylinder
We wish pute the temperature distribution in a long steel cylinder with inner radius 5
inches and outer radius 10 inches.  The interior of the cylinder is kept at 75 deg F, and heat
is lost on the exterior by convection to a fluid whose temperature is 40 deg F.   The convection
coefficient is BTU/hr--F and the thermal conductivity for steel is BTU/hr-in-F.
1. Start ANSYS and assign a job name to the project.  Run Interactive -> set working directory
and jobname.
2.  Preferences -> Thermal will show -> OK
3.  Recognize symmetry of the problem, and  a quadrant of a section through the cylinder is
created using ANSYS area creation tools.  Preprocessor -> Modeling -> Create -> Areas -> Circle
-> Partial annulus
The following geometry is created.
/~lawrence/ansys/2Dheat/
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4.  Preprocessor -> Element Type -> Add/Edit/Delete -> Add -> Thermal Solid -> Solid 8 node 77 -
> OK -> Close
5.  Preprocessor -> Material Props -> Isotropic -> Material Number 1 -> OK
            EX = (psi)
            DENS = -4 (lb sec^2/in^4)
            ALPHAX = -6
            PRXY =
            KXX = (BTU/hr-in-F)
6. Mesh  the area and refine using methods discussed in previous examples.
/~lawrence/ansys/2Dheat/2Dheat