Objective
This course objective is to provide an understanding of computational finite element heat transfer. Presentations 1-8 focus on the various heat transfer modeling issues one must understand in using LS-DYNA. This is followed by an introduction to thermal-stress and thermal-fluid problems. Workshop problems are used to illustrate the points made in the lectures.
Notes
The instructor for this course is Dr. Art Shapiro. Lectures begin daily at 9:00 a.m. and run until 5:30 p.m., except for the last day when the course concludes at 12:00 p.m. The classroom machines are PCs running Linux (CA) or Windows (MI).
Contents
- Introduction – Learn to create a KEYWORD input file to solve for the thermal expansion of an aluminum block.
- Mathematical Theory – brief, but can’t be avoided.
- Time Step Control – Learn how to select a time step size, use the variable time step option, and understand the difference between fully implicit and Crank Nicolson time integration methods.
- Boundary Conditions – Learn how to define temperature, flux, convection, and radiation boundary conditions. Learn how to hand calculate a convection heat transfer coefficient.
- Nonlinear Problems – Learn nonlinear heat transfer by solving a solid-liquid phase change problem.
- Equation Solvers – Learn the advantages and disadvantages between the Gauss direct solvers & conjugate gradient iterative solvers in LS-DYNA.
- Thermal Contact – Learn thermal contact modeling issues by solving a sheet metal forming problem with thin and thick shells.
- Miscellaneous – Learn special applications including powders, welding, induction heating, and thermostat control.
- Thermal-stress coupling – An introduction to coupled thermal stress modeling with upsetting, forging, extrusion, and sheet metal forming applications.
- ALE coupled thermal mechanics – How to use ALE for very large deformation thermal stress problems.
- Thermal-fluid-coupling - An introduction to coupled thermal fluid modeling with casting applications.