ANSYS CFD Study for High Lift Aircraft Configurations

Zore, Krishna; Shah, Shoaib; Stokes, John; Sasanapuri, Balasubramanyam; Sharkey, Patrick

doi:10.2514/6.2018-2844

Cited by 46 publications

(36 citation statements)

References 19 publications

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“…Polyhexacore mesh was used for more accurate results. [11,12] and uniform prism layer was applied to the building model shown in Figure 3. Using the y+ value of 200, the first cell height was calculated to be 0.01 mm.…”

Section: Methodology Model Geometry Computational Domain and Building Configurationmentioning

confidence: 99%

Investigation on the effect of opening position across an isolated building for wind-driven cross ventilation

Moey

Chan

Tai

et al. 2021

JMES

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This study investigates the effect of opening position on the indoor airflow of a natural ventilated isolated building model. Furthermore, the opening configuration which generate the highest ventilation is to be determined. Seven different opening configurations were considered by varying the opening position on the windward and leeward walls which include three cases of aligned openings and four non-aligned openings. Models with different opening position were simulated using Computational Fluid Dynamics (CFD) with 3D RANS turbulence model Shear Stress Transport (SST) k- ω. Simulation result indicates the indoor air velocity as well as pressure distribution highly depends on both inlet and outlet opening positioning. Different opening configuration influences the recirculation zone generated within the building model. Comparison shows openings located near the roof generate 6.52% higher ventilation rate compared to openings located near the ground. The study concludes that opening position holds a crucial role in affecting internal airflow pattern, air recirculation and ventilation rate for a natural cross ventilated building.

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Section: Methodology Model Geometry Computational Domain and Building Configurationmentioning

confidence: 99%

Investigation on the effect of opening position across an isolated building for wind-driven cross ventilation

Moey

Chan

Tai

et al. 2021

JMES

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“…Therefore, for the following analysis, a grid size of 380000 and 420000 were considered for artery models of all three angulations under healthy and stenosed cases. The properties of blood being; density of 1050 kg/m 3 and dynamic viscosity of 0.00345 Pas obtained from well-known medical literatures [49,50]. Transient analysis was done for the models-Artery-30, Artery-60 and Artery-90 of both cases-Healthy and Single-stenosed were done using FLUNT Solver 19.0.…”

Section: Discussionmentioning

confidence: 99%

Numerical Analysis on A Non-Critical Stenosis in Renal Artery

Hegde

Shenoy

Barboza

et al. 2021

ARFMTS

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The increase in cardiovascular diseases worldwide has resulted in higher death rate of people globally; the primary reason being atherosclerosis. A better understanding of this condition can be achieved through the application of numerical methods to understand the haemodynamics. The present study aims to investigate the effects of renal artery angulation on the flow characteristics in a non-critically stenosed artery compared to that of a normal artery in order to understand better, the reasons for causes and progression of renal artery stenosis. Abdominal aorta-renal artery models ranging from 30° to 90° angulations were generated from computerized tomography-angiogram slices, post which they were subjected to cleanup and defeaturing. Haemodynamic parameters such as velocity, pressure and time-averaged wall shear stress were evaluated at early systole, peak systole and peak diastole for the different artery models. Extensive amounts of flow recirculation were observed in normal renal arteries with higher bifurcating angles, whereas it was not the case in stenosed arteries where flow acceleration was seen for the duration of the cardiac cycle. Evaluation of static pressure encountered a similar trend where an increase in angulation saw a decrease in pressure for normal arteries which contradicted with stenosed artery results. Analysis of shear stress saw very similar trends in normal and stenosed arteries, with lower angulation profiles experiencing higher values of shear stress at the Ostia. In the cases of arteries of higher angulation with a non-critical stenosis, the possibility of worsening of stenosis into an opprobrious stage remains a concern.

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“…Furthermore, the results are aligned with Smirnov and Menter [34], who underline the accuracy improvements because of the rotation/curvature corrections on the original SST k-ω model and the model's competitiveness with the RSM model in complex three-dimensional flows, since it is acceptably accurate but at the same time significantly more computationally efficient and robust than the latter. Finally, it should also be mentioned that the rotation/curvature correction factors introduced here are also proposed by K. Zore, et al [38] in the junction flow simulations, since the SST k-ω option of rotation/curvature correction can effectively decrease the eddy viscosity in areas of overly complex flow structures, such as junction flows. The positive effect of the rotation/curvature correction in junction flows is also mentioned in CL Rumsey, et al , for the quadratic constitutive relation form of Spalart-Allmaras turbulence model.…”

Section: Governing Equations and Turbulence Modellingmentioning

confidence: 94%

Mathematical Modelling and Comparative Numerical Simulations of Swing-Fuselage Junction Vortex Structures

S¹,

NC²

2022

J Aerosp Eng Mech

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Turbulence and flow disturbances occurring at the aircraft wing-fuselage junction cause a deterioration of its aerodynamic performance and an increase in the aircraft's drag force. However, the aircraft junction regions are currently designed empirically due to the lack of knowledge of detailed junction flow dynamics, which consequently leads to less efficient flow management and poorer aerodynamic characteristics. The main objective of the present mathematical-modelling study is research on an aerodynamically enhanced design approach, concerning the improvement of the characteristics of the junction flow and its vortices. Numerical simulations are performed under the prism of vortices' structure formation and patterns, particularly of the horseshoe and corner separation vortices, which dominate such flows. More specifically, this research study proposes a new junction flow parameter, which has been employed in combination with the existing ones, in order to result in a more streamlined and efficient junction design, and investigates the junction flow response, when the reference junction design of a wing-fuselage system is modified by the addition of "fillet", "strake" and "blending" geometry types on the wing. Flow simulations are performed in steady-state mode, at transonic flight regime and at 2° angle of attack, using two turbulence models: The Reynolds Averaged Navier-Stokes (RANS) SST k-ω turbulence model, enhanced with rotation/curvature corrections (SST-CC) and with eddy viscosity and turbulence production limiters, and the second-order closure Reynolds Stress model. The geometrical modifications that were implemented proved to be efficient and their application in the design process of modern aircraft foreshadows the possibility of achieving enhancedperformance flights. More specifically, all the three modifications of the reference geometry increased the aircraft's aerodynamic efficiency, by improving the flow pattern around the wing-fuselage regions at the studied flight state. The most promising configuration proved to be the one which combined the "fillet" and "strake" geometries, resulting in the highest aerodynamic efficiency, by greatly weakening the horseshoe vortex and eliminating the corner separation.

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ANSYS CFD Study for High Lift Aircraft Configurations

Cited by 46 publications

References 19 publications

Investigation on the effect of opening position across an isolated building for wind-driven cross ventilation

Investigation on the effect of opening position across an isolated building for wind-driven cross ventilation

Numerical Analysis on A Non-Critical Stenosis in Renal Artery

Mathematical Modelling and Comparative Numerical Simulations of Swing-Fuselage Junction Vortex Structures

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