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Basics : Free Convection flow

This LS-DYNA simulation shows a simple ICFD free convection problem. Since the solver is incompressible, density is a constant. Instead, the tiny density variations due to the rise in temperature are approximated by a external force applied on the system and function of the fluid's thermal expansion coefficient, gravity and fluid temperature (Boussinesq approximation). Depending on the Raleigh number value, different vortex behaviors can be observed.