Önden Ve Yanal Rüzgar Şarti Altinda Zamana Bağli Sikiştirilamaz Ahmed Ci̇smi̇ni̇n Sayisal İncelenmesi̇

Zafer, Baha; Haskaraman, Furkan

doi:10.17341/gazimmfd.300613

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Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

2017

DOI: 10.17341/gazimmfd.300613

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Önden Ve Yanal Rüzgar Şarti Altinda Zamana Bağli Sikiştirilamaz Ahmed Ci̇smi̇ni̇n Sayisal İncelenmesi̇

Baha Zafer¹,

Furkan Haskaraman²

Abstract: Ahmed cismi önden ve yanal rüzgar şartları altında incelenmiştir.  Araç arkasında oluşan vorteks yapılarının etkileri gösterilmiştir. Arka yüzey eğim açısına göre sonuçlar irdelenmiştir.

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Cited by 6 publications

References 17 publications

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Active control for a low-drag Ahmed vehicle model based on steady blowing

Deng,

Fan,

Zhang

et al. 2024

Physics of Fluids

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An experimental investigation is conducted on the active drag reduction (DR) of an Ahmed body with a rear slant angle of 35°, corresponding to the low-drag regime, using single and combined actuations at the Reynolds number Re = 1.7 × 105. Five different actuations, produced by steady blowing jets, are deployed independently around the edges of the rear slant surface and vertical base, achieving the maximum DR of 1%–9%. An artificial intelligence control system based on ant colony algorithm is used for finding near-optimal control laws of the combined jets. With both DR and control power input considered in the cost function, the maximum DR obtained reaches 18%, though the corresponding control efficiency η (≡ES/EI, where ES and EI are the saved power due to DR and the total input power of the actuations, respectively) is only 0.13. However, η may go up greatly, climbing to 5.8, given a 3% sacrifice of DR. Extensive flow measurements are conducted, with and without control, to understand the flow physics and mechanisms under the control of individual and combined actuations. A linear regression model is established to describe the correlation between the control efficiency and parameters under the combined actuations.

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Active control for a low-drag Ahmed vehicle model based on steady blowing

Deng,

Fan,

Zhang

et al. 2024

Physics of Fluids

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Bir Kara Aracının Aerodinamik Sürüklenmesi Üzerine Yan Cihazların ve Yan Rüzgâr Akışının Etkisinin İncelenmesi

Şumnu

2022

Çukurova Üniversitesi Mühendislik Fakültesi Dergisi

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In the present study, effect of side devices and crosswind flow are investigated to observe aerodynamic drag coefficient for a simplified ground vehicle (Ahmed body) since it directly effects fuel consumption. When the literature was examined, the studies that were investigated effect of slant angle, velocity and geometric modifications were presented. However, there are few studies that proposed both side device effect and crosswind flow for ground vehicles at different yaw angles. The CFD (Computational Fluid Dynamic) solution is performed both model with side devices and crosswind flow condition. The crosswind flow condition has been analyzed at different yaw angles (β=5°, 10°, 20°, and 30°) to observe how to affected drag coefficient. Pressure contours have been presented for model with and without side devices and under the crosswind flow conditions at rear region of body since the most of the drag force occurs flow separation or adverse pressure gradient. The streamlines velocities have been presented at x-plane which is positioned side devices location under the crosswind flow conditions. In addition, vorticity magnitude has been given for both models with and without side devices at different yaw angle. In the results of study are observed that side devices adversely effects aerodynamic performance since flow separation occurs on the side of body and it causes to increase pressure drag. The pressure drop is also observed at rear region of model due to crosswind flow condition. This causes the increase of drag forces.

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A Strategy for Creating Prismatic Mesh Layers for Modelling Flow of the Ahmed Body Used in Vehicle Aerodynamics

Keiyinci

Akar

Baş

et al. 2022

Mühendislik Bilimleri Ve Tasarım Dergisi

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Bu makalede, otomotiv aerodinamiği literatüründe sıklıkla kullanılan Ahmed cismi için bir HAD benzetiminde ağ oluşturma stratejisi üzerine bir çalışma yapılmıştır. Genel olarak bu çalışmalarda, türbülanslı sınır tabaka bölgelerini modellemek için prizmatik ağ katmanı oluştururken farklı yöntemler gözlemlenmektedir. Yetersiz bir prizmatik ağ katmanı sınır tabakasını çözmede eksik kalırken, bu katmanın gereğinden fazla olması ise ağ sayısını, dolayısıyla çözüm sürelerini artırmaktadır. Bu çalışmada, Ahmed cisminin akış yapısı, Ansys-Fluent™ programı ile akış hızına (U∞=40 m/s) ve gövde uzunluğuna bağlı Reynolds sayısı Re=2.83×106 olacak şekilde incelenmiştir. Matematiksel ifadelerden yararlanılarak oluşturulan prizmatik ağ katmanı ve bu ağın sonuçları hem nitel hem de nicel yönden incelenip, farklı bir strateji geliştirilen son bir ağ ile sonuçlar tekrar değerlendirilmiştir. Sonuç olarak, kabaca oluşturulan ilk ağ ile sonradan geliştirilen ağlar arasında, sınır tabakası üzerindeki akış profilini modellemede daha iyi bulgular elde edilmiştir. Ayrıca CD ve CL için deneysel yöntemle elde edilen sonuçlara, geliştirilen ağlarda, kabaca uygulanan ağa göre daha yakın sonuçlar elde edilmiştir.

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Önden Ve Yanal Rüzgar Şarti Altinda Zamana Bağli Sikiştirilamaz Ahmed Ci̇smi̇ni̇n Sayisal İncelenmesi̇

Abstract: Ahmed cismi önden ve yanal rüzgar şartları altında incelenmiştir.  Araç arkasında oluşan vorteks yapılarının etkileri gösterilmiştir. Arka yüzey eğim açısına göre sonuçlar irdelenmiştir.

Cited by 6 publications

References 17 publications

Active control for a low-drag Ahmed vehicle model based on steady blowing

Active control for a low-drag Ahmed vehicle model based on steady blowing

Bir Kara Aracının Aerodinamik Sürüklenmesi Üzerine Yan Cihazların ve Yan Rüzgâr Akışının Etkisinin İncelenmesi

A Strategy for Creating Prismatic Mesh Layers for Modelling Flow of the Ahmed Body Used in Vehicle Aerodynamics

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