Numerical investigation and dynamical analysis of mixed convection in a vented cavity with pulsating flow

• Pulsating flow in a multiple vented cavity is studied.
• For some combinations of Gr, Re and St, non-symmetrical states are observed.
• The effect of Gr is significant for the HTE with increasing St.
• The RPs shows different structures indicating different dynamic features.
• The RQA reveals different parameters quantifying different dynamics.

In the present study, numerical investigation of pulsating mixed convection in a multiple vented cavity is carried out for the range of parameters; Reynolds number (500⩽Re⩽2000500⩽Re⩽2000), Grashof number (104⩽Gr⩽106104⩽Gr⩽106), Strouhal number (0⩽St⩽20⩽St⩽2). The governing equations are solved with a general purpose finite volume based solver. The effects of various parameters on the fluid flow and heat transfer characteristics are numerically studied. It is observed that the flow field and heat transfer rate are influenced by the variations of Reynolds, Grashof and Strouhal numbers. Furthermore, recurrence plot analysis is applied for the analysis of the time series (spatial averaged Nusselt number along the vertical wall of the cavity) and for a combination of different parameters, the systems are identified using recurrence quantification analysis parameters including recurrence rate, laminarity, determinism, trapping time and entropy.