
The flow of thermal energy from matter occupying one region in space to matter occupying a different region in space is known as heat transfer. Heat transfer can occur by three main methods: conduction, convection, and radiation. Physical models involving conduction and/or convection only are the simplest (Section 13.2), while buoyancydriven flow or natural convection (Section 13.2.5), and radiation models (Section 13.3) are more complex. Depending on your problem, FLUENT will solve a variation of the energy equation that takes into account the heat transfer methods you have specified. FLUENT is also able to predict heat transfer in periodically repeating geometries (Section 13.4), thus greatly reducing the required computational effort in certain cases.