A Brief Review of Particle Dispersion of Cavity Flow

Sahak, Ahmad Sofianuddin A.; Sidik, Nor Azwadi Che; Yusof, Siti Nurul Akmal

doi:10.37934/araset.20.1.2741

Cited by 8 publications

(7 citation statements)

References 67 publications

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“…The flow pattern is usually at the exit of the nozzle, but due to the rib with a 3:3 aspect ratio, this pattern is seen at the rib exit. The influence of rib's geometry on the changes of flow characteristics are consistent with the observation obtained in Sahak et al, [18] who observed the variation of flow regime with the cavity geometry.…”

Section: Resultssupporting

confidence: 91%

Effect of Ribs as Passive Control on Base Pressure at Sonic Mach Numbers

Khan

Mazlan

Sulaeman

2022

CFDL

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Passive control is a method used to control the base pressure of the convergent-divergent nozzle for high speed vehicles. The passive control contributes significant reduction of base pressure which mainly depending on many factors such as number of ribs, flow Mach number and rib’s size. The flow behaviour inside the nozzle at the respected factors still unknown. Therefore, this study aims to assess the effect of ribs in a suddenly expanded flow to control the base pressure at sonic Mach numbers. The study is performed using ANSYS Fluent. The flow expands in a duct with 18 mm diameter and 108 mm length. The ribs have aspect ratios of 3:1 to 3:3 which were fixed to the duct circumferentially. The position of the rib varies from 1D (duct diameter) to 4D and having different aspect ratios. The level of expansion varies from 1.5 to 5 while the rib is fixed at a 3:3 aspect ratio. The variation of pressure and velocity contours of the flow inside the nozzle are presented. The simulation analysis indicates that the flow expansion with the presence of ribs considerably improves the base pressure. It is concluded that at the flow with sonic Mach number, the rib with a 3:3 aspect ratio located at 4D has shown the highest improvement in base pressure.

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Section: Resultssupporting

confidence: 91%

Effect of Ribs as Passive Control on Base Pressure at Sonic Mach Numbers

Khan

Mazlan

Sulaeman

2022

CFDL

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“…While for v-velocity plots (right), the negative v-velocity zone becomes thinner and longer. These phenomena are consistent with the experimental results and can be explained by a higher mass transfer rate of the fluid inside the cavity as Re increases (Sahak et al, 2020). From all these findings, the flow topology is proved to be highly dependent upon the Reynolds number.…”

Section: Reynolds Number Effectssupporting

confidence: 90%

“…Experimental investigations on LDC flow are always undergoing a parallel development with CFD, from the 1980s until recently (Sahak et al, 2020). Although with a certain geometrical simplicity, the flow physics inside this LDC is not such simple.…”

Section: Introductionmentioning

confidence: 99%

Parametric and V&V study in a fundamental CFD process: revisiting the lid-driven cavity flow

Zhang

Brookshire

et al. 2021

AEAT

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Purpose The openings on aircraft structures can be modeled from an aerodynamical point of view as lid-driven cavities (LDC). This paper aims to show the primary verification and validation (V&V) process in computational fluid dynamics (CFD, and to investigate the influences of numerical settings on the efficiency and accuracy for solving the LDC problem. Design/methodology/approach To dig into the details of CFD approaches, this paper outlines the design, implementation, V&V and results of an efficient explicit algorithm. The parametric study is performed thoroughly focusing on various iteration methods, grid density discretization terms and Reynolds number effects. Findings This study parameterized the numerical implementation which provides empirical insights into how computational accuracy and efficiency are affected by changing numerical settings. At a low Reynolds number (not over 1,000), the time-derivative preconditioning is necessary, and k = 0.1 can be the optimal value to guarantee the efficiency, as well as the stability. A larger artificial viscosity (c = 1/16) would relieve the calculating oscillation issue but proportionally increase the discretization error. Furthermore, the iteration method and the mesh quality are two key factors that affect the convergence efficiency, thus need to be selected “wisely”. Practical implications The study shows how numerical implementation can enhance an accurate and efficient solution. This workflow can be used to determine the best parameter settings whenever CFD researchers applying this LDC problem as a complementary design tool for testing newly developed solvers. Originality/value The studied LDC problem is representative of CFD analysis in real aircraft structures. These numerical simulations provide a cost-effective and convenient tool to understand the parameter sensitivity, solution receptivity and physics of the CFD process.

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“…Some of the other main general approaches to the second law can be seen in references [33][34][35]. However, there are some challenges to the second law [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

A General Solution to the Different Formulations of the Second Law of Thermodynamics

Shahsavari

Moradi

2021

ARFMTS

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The second law of thermodynamics is one of the most important physical laws that has been extracted by different formulations. In this paper, a new approach to study different formulations of the second law is extracted based on the energy components of the system as well as introducing the independent and dependent energy components concepts. Also, two main formulations of classical thermodynamics, and also entropy from the perspective of general physics are discussed based on the energy components of the system for constant applied energy to the system in different conditions. Kelvin-Plank and Clausius formulations, as two main classical formulations, are all assertions about impossible processes. Considering the energy structure equation of the system, as an equation to formulate the performed process using activated energy components, it is shown that different formulations of the second law of thermodynamics represent the same concept in the perspective of the energy structure. Finally, a new general formulation to the second law, based on the energy structure of the system is extracted, and the equivalence as the other formulations is shown. The presented formulation is extracted based on the dependent and independent activated energy components, and in fact, shows all possible paths in the considered energy applying to the system.

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A Brief Review of Particle Dispersion of Cavity Flow

Cited by 8 publications

References 67 publications

Effect of Ribs as Passive Control on Base Pressure at Sonic Mach Numbers

Effect of Ribs as Passive Control on Base Pressure at Sonic Mach Numbers

Parametric and V&V study in a fundamental CFD process: revisiting the lid-driven cavity flow

A General Solution to the Different Formulations of the Second Law of Thermodynamics

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