“…Natural convection occurs because of the motion and mixing of fluid, induced by the density variations based on the temperature difference within the fluid. Natural convection has been extensively studied in recent works because of its wide variety in various applications (Siddiqa et al , 2015; Shirvan et al , 2017a, 2017b; Rahman et al , 2017; Oztop et al , 2017; Biswal and Basak, 2017; Sheremet et al , 2018a; Sheremet and Pop, 2018; Gerdroodbary et al , 2018; Chen et al , 2018; Pichandi and Anbalagan, 2018; Revnic et al , 2018; Wang et al , 2018; Ismail et al , 2019; Wong et al , 2019). The fluid flow in natural convection is strongly dependent on the shapes of containers.…”