Numerical investigation of different flow regimes for multiple staggered rows

Abstract

In this numerical exploration, the combined effect of Reynolds number (30 ≤ Re ≤ 150) and gap spacing (1 ≤ g ≤ 7) is studied for two dimensional cross flow across multiple staggered rows of square cylinders. Flow is simulated by using lattice Boltzmann method. Outcomes show that for the outset of vortex shedding phenomenon, the critical Re increases as the normalized g increases. At large Re and at g = 7, 6 and 5, the primary vortex shedding frequency controls the flow whereas the secondary frequency almost vanishes. The jets in the gap region have strong influence upon the wake interaction. The nature of the wakes is changed by changing the g and Re which is visualized by the change of wake size behind the cylinders. These g depending on the Re are used to split the flow regimes into chaotic, quasiperiodic-I and quasiperiodic-II flow regimes. Some physical parameters of practical importance are also analysed.

Numerical Investigation on the Transition of Fluid Flow Characteristics Through a Rotating Curved Duct

“…They enumerated the power spectral density for the lift coefficient. Almost the same study was carried out by Nazeer et al [8] for multiple staggered rows of square cylinders. Secondary structures due to the unsteady flow through a curved duct were investigated by Krishna et al [9].…”

Investigation on Energy Distribution in Steady and Unsteady Flow Instabilities through a Bend Square Pipe

“…Fluid characteristics through the ducts investigations play a very important role in many biological and engineering applications. Two-dimensional flow regimes between two square cylinders for different Reynolds numbers and gap ratios have been disclosed by Nazeer et al (2019). By validating the fluid flow found by computational fluid dynamics with the particle image velocimetry measurements, Li et al (2016Li et al ( , 2017 depicted the Dean instabilities in the mass and energy transfer for rectangular bend channel.…”

Numerical Investigation of Convective Heat Transfer and Fluid Flow Past a Three Square Cylinders Controlled by a Partition in Channel

“…Thus, a host of experimental and numerical investigations has been carried out, during the last years, to understand the flow and heat transfer past of square cylinders, circular or any other geometric shapes of a cylinder in cross flows with or without a control plate (Abbasi et al, 2014;Dey, 2021;Dhiman et al, 2005;Doolan, 2009;Guo et al, 2020;Islam et al, 2015;Koutmos et al, 2004;Kumar et al, 2015;Rashidi et al, 2015;Rashidi et al, 2016;Sohankar et al, 2018;Turki, 2008;Vamsee et al, 2014). Nevertheless, few works have addressed the interference effects between multiple cylinders and the number of publications available becomes drastically smaller as the number of cylinders involved increases (Aboueian et al, 2017;Nazeer et al, 2019;Nguyen et al, 2021;Sumner, 2010;Tong et al, 2015). As well, there is very little investigation into the coupling between fluid flow and heat transfer around several cylinders Admi et al, 2020;Chatterjee et al, 2012;Moussaoui et al, 2009).…”