Numerical exploration of flow topology and vortex stability in a curved duct

Tsai, Shun-Feng; Sheu, Tony W. H.

doi:10.1002/nme.1959

Cited by 8 publications

(5 citation statements)

References 26 publications

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“…Another comparison was conducted with the experimental data of Humphrey et al [26] for flow in a 90 • square bend with strong curvature (Re = 790, = 0.4348). This flow problem has been studied numerically by many researchers using a variety of methods [27][28][29][30]. Figure 10 shows normalized axial velocity profiles at two different radial locations r * = 0.3 and r * = 0.7 for angles = 60 • and 90 • where r * = (r −r o )/(r i −r o ) and r i and r o are the inner and outer diameters, respectively.…”

Section: D Steady State Flow In Curved Ductsmentioning

confidence: 99%

“…Figure 10 shows normalized axial velocity profiles at two different radial locations r * = 0.3 and r * = 0.7 for angles = 60 • and 90 • where r * = (r −r o )/(r i −r o ) and r i and r o are the inner and outer diameters, respectively. The plots of Figure 10 include the numerical results of Tsai and Sheu [27], Drikakis et al [28] and Sotiropoulos et al [29] who used a finite elements approach, the artificial compressibility method and a pressure-linked method, respectively. The CVP method is applied with the FE formulation on a 40×40×345 grid along the bend.…”

Section: D Steady State Flow In Curved Ductsmentioning

confidence: 99%

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Improved CVP scheme for laminar incompressible flows

Papadopoulos

Hatzikonstantionou

2011

Numerical Methods in Fluids

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SUMMARYAn improved scheme of the continuity vorticity pressure (CVP) variational equations method is presented. The changes from the original version of the CVP method concern the velocity and the pressure correction equations that are used in the solution procedure and the topology of the grid where the method is applied. The improved CVP scheme is faster, simpler and more stable than the original version of the method. The efficiency and the accuracy of the new scheme are tested and validated through comparison of predictions and of computational time, with numerical results obtained with the SIMPLE method. Moreover, we present extensive comparisons of the results of the improved CVP scheme with numerical and experimental data from various researchers that show excellent agreement for a wide range of benchmark 2D and 3D laminar internal flow problems such as flow over a backward facing step, flow in square, circular and elliptical curved ducts and pulsating flow.

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Section: D Steady State Flow In Curved Ductsmentioning

confidence: 99%

Section: D Steady State Flow In Curved Ductsmentioning

confidence: 99%

Improved CVP scheme for laminar incompressible flows

Papadopoulos

Hatzikonstantionou

2011

Numerical Methods in Fluids

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“…It has also been shown that this streamwise velocity gradient increases with increasing bend turning angle. 29 The maximum mainstream velocity occurs at h ¼ 26 ( Figure 4) with a value of 1.34W b and at a radial position r* ¼ 0.90 on the symmetry plane. The developed velocity gradient then persists with downstream distance, with a reversal of the location of the peak velocity toward the outer wall, leading to a deceleration near the convex wall and an acceleration near the concave wall between h ¼ 30 and 90 .…”

Section: Fluid Phasementioning

confidence: 99%

“…Figure 3 shows the streamwise distribution of the pressure coefficient across the transverse (radial) direction for the entire length of the curved duct. The pressure coefficient C p is defined 2,29 by…”

Section: Fluid Phasementioning

confidence: 99%

Prediction of turbulent gas‐solid flow in a duct with a 90° bend using an Eulerian‐Lagrangian approach

Njobuenwu

Fairweather

2011

AIChE Journal

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in Wiley Online Library (wileyonlinelibrary.com).A dilute, particle-laden turbulent flow in a square cross-sectioned duct with a 90 bend is modeled using a three-dimensional Eulerian-Lagrangian approach. Predictions are based on a second-moment turbulence closure, with particles simulated using a Lagrangian particle tracking technique, coupled to a particle-wall interaction algorithm and a random Fourier series method used to model particle dispersion. The performance of the model is tested for a gas-solid flow in a horizontal-to-vertical duct, with predictions showing good agreement with experimental data. In particular, the consistent use of anisotropic and fully three-dimensional approaches throughout yields predictions that result in fluctuating particle velocities in acceptable agreement with data.

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“…Papadopoulos and Hatzikonstantinou (2005) numerically examined the incompressible and fully developed laminar flow in a curved square duct with four internal longitudinal fins using alternating direction implicit method (ADI). Tsai and Sheu (2007) studied the incompressible three dimensional laminar flow in a 90 • curved square duct with curvature ratio, i.e. the ratio of curvature radius to the edge length of duct, of 2.3 for Reynolds number of 790.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Flow and Heat Transfer in a Curved Square Duct with Longitudinal Triangular Rib Using Al2O3/Water Nanofluid

Celen¹,

Evran²,

Turgut³

et al. 2018

AJTE

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Flow and heat transfer characteristics in curved ducts are different from that of straight ducts. A numerical study of a steady and three dimensional laminar flow in a 180o curved square duct with longitudinal isosceles triangular rib has been conducted to investigate the effects of rib height, Dean number and volume fraction of Al2O3/water nanofluid on flow and heat transfer characteristics. ANSYS Fluent 17.0 commercial program is used for numerical simulation. Study is implemented for six Dean numbers changing from 250 to 1500, three different rib heights, and eight volume fractions varying from 0% to 5%. Velocity and temperature regions, heat transfer coefficient (h), pressure loss (investigated. Present results are compared with the literature results. It is seen that present results are in good agreement with the results of literature. Results show that Dean number (De), rib height (H) and volume fraction of nanofluid (vof) affect the heat transfer coefficient and pressure drop. It is seen that heat transfer coefficient may be increased by 59.0% for water as the working fluid when longitudinal isosceles triangular rib is used in curved square duct compared to ribless duct. Heat transfer coefficient may also be augmented by 30.8% using nanofluid as the working fluid in a curved square duct with rib. Results show that using longitudinal isosceles triangular rib in a curved square duct is advantageous.

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Numerical exploration of flow topology and vortex stability in a curved duct

Cited by 8 publications

References 26 publications

Improved CVP scheme for laminar incompressible flows

Improved CVP scheme for laminar incompressible flows

Prediction of turbulent gas‐solid flow in a duct with a 90° bend using an Eulerian‐Lagrangian approach

Numerical Study of Flow and Heat Transfer in a Curved Square Duct with Longitudinal Triangular Rib Using Al2O3/Water Nanofluid

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