Numerical Research of Flow past a Circular Cylinder with Splitter Plate at a Subcritical Reynolds Number Region

An, Xinyu; Song, Baowei; Tian, Wenlong; Ma, Congcong

doi:10.1007/s12204-019-2045-y

Cited by 9 publications

(6 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Variasi diameter bodi pengganggu sebesar (d = 1mm-10mm), bilangan Reynolds berkisar antara (Re = 1,5 x 10 4 -6,2 x 10 4 ), dan rasio jarak (L = 50mm120mm). Pengurangan koefisien drag dan koefisien drag total optimal pada (d/D = 0,25; L/D = 2; Re < 4,1x10 4 ) dan (d/D = 0,25; L/D = 1,75; Re  4,1x10 4 ). Nilai C D dan C DT berkurang sebesar 73% dan 63% dibandingkan dengan silinder sirkular tunggal tanpa bodi pengganggu [1].…”

Section: Pendahuluanunclassified

“…(2018) 2019) melakukan penelitian karakteristik aliran yang melintasi silinder sirkular dengan penambahan splitter plate pada bilangan Reynolds subkritis yaitu 5 x 10 4 -9 x 10 4 dengan variasi panjang dari splitter plate yaitu 0.5D; 1D; 1.5D; 2D; 2.5D; 3D; 3.5D; 4D. Dihasilkan bahwa dengan penambahan splitter plate, koefisien tekanan pada silinder mengalami reduksi dan meningkatkan nilai koefisien tekanan base pada silinder [4]. R. Han, et.al.…”

Section: Pendahuluanunclassified

See 1 more Smart Citation

Studi Numerik Karakteristik Aliran Melintasi Silinder Sirkular dengan Penempatan Airfoil NACA 0012, NACA 0018, NACA 0024 di Belakang Silinder

Hutagalung,

Widodo

2024

JTITS

View full text Add to dashboard Cite

Abstrak-Salah satu fenomena yang sedang diteliti saat ini adalah aliran fluida yang melintasi susunan bluff body berbentuk silinder. Konsep boundary layer yang ditemukan oleh Ludwig Prandtl pada tahun 1904 menjadi dasar berkembangnya para peneliti melakukan analisis dan kajian mengenai topik bluff body tersebut. Penerapan bluff body pada umumnya menggunakan geometri berupa bentuk sirkular atau elips. Dalam penelitian Ludwig Prandtl, boundary layer yang terbentuk di sekitar aliran fluida dekat permukaan menyebabkan gesekan yang signifikan. Contoh pengaplikasian dalam kehidupan sehari-hari meliputi aerodinamika yakni seperti pada pesawat terbang, hidrodinamika yakni seperti aliran pada di dalam atau di luar pipa saluran air atau heat exchanger, dan sebagainya. Dari penelitian yang telah dilakukan sebelumnya, hasilnya menunjukkan bahwa adanya gaya hambat yang timbul pada aliran tersebut, maka dari itu dilakukan penelitian dengan metode numerik untuk mengurangi gaya hambat pada silinder sirkular dengan penambahan airfoil di belakang silinder sirkular. Penelitian dilakukan dengan software Fluent 2021 R2 menggunakan diameter silinder sirkular, D = 36 mm dan chord length (c) sama sebesar 36 mm. Bilangan Reynolds sebesar, Re = 2.01x10 4 . Variasi yang digunakan pada penelitian ini adalah variasi jenis airfoil (NACA 0012, NACA 0018, NACA 0024) dengan variasi jarak dari trailing edge silinder sirkular utama terhadap leading edge airfoil (S/D = 1). Untuk penelitian secara numerik menggunakan solver dua dimensi (2D) unsteady flow dengan turbulance viscous model k-ω Shear stress transport. Dari hasil simulasi diperoleh bahwa adanya penambahan airfoil di belakang silinder sirkular dapat mereduksi koefisien drag (𝐂 𝐃 ). Didapatkan reduksi koefisien drag (𝐂 𝐃 ) paling efektif dihasilkan pada konfigurasi NACA 0012 sebesar 18,5%. Sedangkan reduksi koefisien drag (𝐂 𝐃 ) terendah dihasilkan pada konfigurasi NACA 0024 sebesar 16,5%.

show abstract

Section: Pendahuluanunclassified

Studi Numerik Karakteristik Aliran Melintasi Silinder Sirkular dengan Penempatan Airfoil NACA 0012, NACA 0018, NACA 0024 di Belakang Silinder

Hutagalung,

Widodo

2024

JTITS

View full text Add to dashboard Cite

show abstract

“…Moreover, adding a circumferential flow plate is also an effective flow control method. As Figure 1a shows, many scholars [13][14][15][16][17][18][19] added a spoiler in the wake of a cylinder, and found that the drag reduction effect and the vortex shedding frequency are strongly associated with the spoiler length. Anderson et al [17] discovered that the drag coefficient can be reduced by roughly 30% at most when the length of the circumferential flow plate is equivalent to the cylinder diameter according to numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Effect of NACA0012 Airfoil Pitching Oscillation on Flow Past a Cylinder

et al. 2021

View full text Add to dashboard Cite

The flow past a cylinder is a classical problem in flow physics. In a certain range of Reynolds number, there will be Karman vortex street phenomenon in the wake of a cylinder, which will greatly increase the pressure drag of the cylinder. By controlling the vortex shedding phenomenon, drag reduction of the cylinder could be effectively realized. In this paper, a NACA0012 airfoil with pitching oscillation is placed downstream of the cylinder. Based on the tight coupling method, kinematics equations and Navier–Stokes equations in the arbitrary Lagrangian–Eulerian form are solved. Firstly, the effect of airfoil oscillation period and the distance between airfoil leading edge and cylinder center (x/D) are studied respectively, especially considering the aspects of vortex shedding and drag reduction effect. Besides, the vortex interaction in the flow field around the airfoil and cylinder is analyzed in detail. It is found that the NACA0012 airfoil with pitching oscillation can change the period of vortex shedding. Moreover, it can also increase the drag reduction rate to as high as 50.5%, which presents a certain application prospect in the engineering drag reduction field, e.g., for launch vehicles, ship masts, submarine pipelines, etc.

show abstract

“…The splitter plate at the two-dimensional location, no effect of the plate was observed. Xinyu et al [13] simulated twodimensional incompressible flow over a circular cylinder with a splitter numerically. Results showed that vortex shedding is observed when the splitter length is more extensive than four times the cylinder's diameter.…”

Section: Introductionmentioning

confidence: 99%

Thermo-flow Analysis of Cylinder with Crossed Splitter Plates with a Characteristics-based Scheme

Razavi

Adibi

Hassanpour

2021

International Journal of Thermodynamics

View full text Add to dashboard Cite

In the present work, the laminar flow through a circular cylinder with two crossed splitter plates is analyzed. The characteristic-based method has been used along with the unstructured grid. The current research has been done to detect the proper conditions according to the geometrical parameters in which the optimal heat transfer is taking place. Geometric control parameters are the angle of splitter plates (\theta) and the ratio of length of the splitter plate to cylinder radius (n=L/D). It was found that the use of a two-branched splitter plate is not wise in Reynolds number less than 100 due to its insignificant effect in flow properties. In angle 30° between two plates, the least drag force is witnessed with respect to other angles. Application of double branched splitter with angles more than 60° is not recommended, which will increase the total drag significantly. Since the splitter plate increases, the overall heat transfer from the cylinder and splitter set is enhanced. Minimum drag over the cylinder, and maximum convection drop from it is taken place when the dimension length is 0.75. Between dimensionless lengths 1.25 and 1.5, the Nusselt number oscillates with least amplitude and such behavior is also observed when two splitters are 60°apart.

show abstract

Numerical Research of Flow past a Circular Cylinder with Splitter Plate at a Subcritical Reynolds Number Region

Cited by 9 publications

References 19 publications

Studi Numerik Karakteristik Aliran Melintasi Silinder Sirkular dengan Penempatan Airfoil NACA 0012, NACA 0018, NACA 0024 di Belakang Silinder

Studi Numerik Karakteristik Aliran Melintasi Silinder Sirkular dengan Penempatan Airfoil NACA 0012, NACA 0018, NACA 0024 di Belakang Silinder

Effect of NACA0012 Airfoil Pitching Oscillation on Flow Past a Cylinder

Thermo-flow Analysis of Cylinder with Crossed Splitter Plates with a Characteristics-based Scheme

Contact Info

Product

Resources

About