Convection process 1 Darcy number Elliptic obstacle 1 Energy efficiency 1 FEM 1 Finite element method 1 Forced convection 1 Heat generation 1 Heat transfer rate 1 Isothermal region 1 Isotherms 1 Lid-driven 1 Nanofluidics 1 Nanofluids 1 Nanoparticles 1 Porous materials 1 Porous medium 1 Reynolds number 1 Split lid-driven 1 Steam piping systems 1 Thermal conductivity 1 Triangular cavities 1 convection 1 elliptic obstacle 1 forced convection 1 heat generation 1 modeling 1 nanoparticle 1 porous medium 1 split lid-driven 1