中文说明：模拟瑞利-贝纳尔对流 fluid(2D) 薄薄一层在底部和顶部墙是刚性、 不透水和等温无滑移与侧墙是绝热 （绝缘） Boussinesq 近似用来模拟浮力驱动流
English Description：
Simulating Rayleigh-Benard convection in thin layer of fluid(2D) Bottom and top walls are rigid, impermeable and isothermal with no-slip Side walls are adiabatic (insulated) Boussinesq approximation is used to model the buoyancy driven flow