This study aims to develop an adaptive mesh refinement (AMR) algorithm combined with Cut-Cell IBM using two-stage pressure–velocity corrections for thin-object FSI problems. To achieve the objective of this study, AMR-immersed boundary method (AMR-IBM) discretizes and solves equations motion flow that involves rigid thin structures layer at interface between structure fluid. The body forces are computed in proportion fraction solid volume fluid cells incorporate motions into boundary....

This study is intended to investigate the effect of various degree and position (pre-bifurcation post-bifurcation) stenosis on carotid artery hemodynamics trough realistic CFD numerical simulations with appropriate turbulence model. The blood rheological properties were assumed as incompressible Newtonian fluid. A 3 dimensional model a non-stenotic was used this investigation. Several tested. geometry altered 30% 70%pre-bifurcation model, 70% post-bifurcation Pulsatile conducted for each...

A shading device is integrated into a building in reducing the indoor solar heat gained. However, incorporation of an opening provides certain effects on natural ventilation. Its performance enhancing airflow still arguable. For this reason, comprehensive review was executed to identify ventilation building. schematic process published articles that were related devices at openings. Subsequently, 25 have examined The output parameters discussed including, gained, temperature, energy...

This research focuses on optimizing the design of dimples a Blended-Wing-Body (BWB) airframe to enhance aerodynamic efficiency. Dimples serve as passive flow control method intended improve properties. Employing Design Experiments (DOE) framework and utilizing Taguchi method, we examined five dimple variables across three distinct levels. These included placement, indentation depth, diameter, spacing between dimples, number rows BWB wing. An L 18 orthogonal array (OA) was implemented assess...

Abstract This study explores the efficacy of dimples in influencing aerodynamic performance a straight rectangular wing. Computational Fluid Dynamics based numerical simulations were performed to model turbulent flow and quantify forces exerted on The k-ω Shear-Stress Transport turbulence was chosen solve underlying equations. To ascertain reliability, results compared with both experimental simulation previous studies. impact various dimple configurations, placed at 15%, 50% 85% chord...

This paper aims to simulate the interaction between a simplified tongue replica with expiratory air flow considering in pharyngeal airway be turbulent. A three‐dimensional model low‐Re SST turbulence is adopted. An Arbitrary Eulerian‐Lagrangian description for fluid governing equation coupled Lagrangian structural solver via partitioned approach, allowing deformation of domain captured. Both features and collapsibility are presented. In addition, examining initial constriction height ranging...

This paper aims to identify and study the blood flow acoustics characteristics of different degrees stenosis in carotid artery. Blood will produce acoustics, but presence levels are expected acoustic characteristics. The simulated by using computational fluid dynamics software (CFD). Several three-dimensional models arteries that have used together with a normal/healthy artery - i.e., 30% 70% blockage. geometry stenosed model computationally generated from normal geometry. In addition,...

This manuscript contains the development stages of a multi-purpose wind tunnel built at Faculty Engineering and Built Environment, Universiti Kebangsaan Malaysia. The fully automated is named Pangkor after an island in Perak, consists three namely design, fabrication testing & commissioning. computational fluids dynamic (CFD) approach was employed to ascertain main geometries optimize space utilization. Calculations are made based on typical design guidelines. Pitot tubes-pressure...

Rotating machinery utilizes fluid film bearings because of their good load carrying capacity and inherent damping properties. Fluid offer stiffness parameters to ensure dynamic stability. The characteristics oil significantly change the critical speed unbalance response rotor. coefficients (direct, cross-coupled) may lead system instability, also known as self-excited vibrations. Bio-oils have tribological physiochemical They are environment-friendly bio-degradable. In this work, bio-oils...

Blended-Wing-Body (BWB) aircraft designs have attracted considerable attention due to their potential for enhancing aerodynamic efficiency and fuel economy. This study investigates the integration of dimples on BWB airframes further improve performance. Computational Fluid Dynamics (CFD) simulations were used characterize turbulent airflow estimate associated forces. The k-ω Shear-Stress Transport (SST) turbulence model was employed solve underlying equations. objective is investigate impact...

Mineral-based oils are the market leaders when it comes to their consumption in different types of rotating machines. Recently, a lot attention has been given bio-oils and lubricants due better thermophysical, tribological, environmental characteristics for use journal bearing other The superior physical properties have instigated this research order evaluate dynamic that can cause harmful instabilities machinery. fluid film influenced by temperature, eccentricity ratio, rotational speed. In...

A three dimensional computational fluid dynamic (CFD) analysis was conducted to understand the hydrodynamic performance of a dimple texture produced using recently invented low-cost dynamic-assisted tooling (DAT) in machining process. Five different area ratios, α r 0%, 1.63%, 3.26%, 6.53%, and 9.80%, sliding speeds represented by Reynolds number, Re 10, 45, 80 were analyzed. From study, there existed an optimum ratio which generated up 290% higher load-carrying capacity compared fully...

Purpose This study aims to simulate the influence of surface texturing produced via turning process toward pressure distribution and load capacity generation using computational fluid dynamics (CFD). Design/methodology/approach The dimple geometry was obtained process, be used for future application on piston skirt surfaces. Two cases were studied: a preliminary single periodic assuming linear an multiple dimples address actual orientation following process. Findings For first case, proven...

Flexible cantilever beams in channel flow loses its stability through a flutter mechanism at sufficiently high Reynolds number. This sustained transfer of work to beam oscillation could be extracted generate electrical power, which may utilized power wireless sensors for structural health monitoring or supply additional unmanned micro air vehicles. Such flexible system is known exhibit some form hysteresis, with super- and sub-critical velocities onset flutter, not captured by current...

Considerable research has been conducted in the past decade and a half regarding bio-lubricants potential to replace mineral-based lubricants as mainstream such engine oil, hydraulic compressor metalworking oil. This study studied several (rapeseed palm olein, soybean oil) lubricant, SAE40. The have better physiochemical, tribological characteristics environmental friendly nature, are promising lubricants. In this study, journal bearing test rig (JBTR) was developed order investigate effect...

This study aimed to investigate the effects of element diffusion on alloying behaviour and microstructure a Ti-10%Mo-10%Cr alloy during sintering furnace cooling.A theoretical calculation average distance for each was performed predict cooling.The fabricated using blended powder metallurgy approach.Micrograph samples after showed bright-circle structures significantly decreased equiaxed structures.The number plate-like increased with prolonged time.Microstructural changes occurred because...