Hybrid mesh finite volume CFD code for studying heat transfer in a forward-facing step

Jayakumar, J. S.; Kumar, I. J.; Eswaran, V.

doi:10.1088/0031-8949/2010/t142/014060

Cited by 7 publications

(8 citation statements)

References 19 publications

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“…This configuration produces a region of unsteady recirculation and subsequent reattachment of the flow. The few studies examining heat transfer in flow past a forward-facing step find a maximum in convective heat transfer at the point of reattachment [1,23]. Different estimates for the reattachment length exist (summarised in [30]) but all find that it is roughly 3 to 5 times the step height for Reynolds numbers Re = 10 3 to 10 5 (our experiment is at Re ≡ U D/ν = 800, based on the step height).…”

Section: Qualitative Observationsmentioning

confidence: 94%

Aspect ratio affects iceberg melting

Hester,

McConnochie,

Cenedese

et al. 2020

Preprint

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Iceberg meltwater is a critical freshwater flux from the cryosphere to the oceans. Global climate simulations therefore require simple and accurate parameterisations of iceberg melting. Iceberg shape is an important but often neglected aspect of iceberg melting. Icebergs have an enormous range of shapes and sizes, and distinct processes dominate basal and side melting. We show how different iceberg aspect ratios and relative ambient water velocities affect melting using a combined experimental and numerical study. The experimental results show significant variations in melting between different iceberg faces, as well as within each iceberg face. These findings are reproduced and explained with novel multiphysics numerical simulations. At high relative ambient velocities melting is largest on the side facing the flow, and mixing during vortex generation causes local increases in basal melt rates of over 50%. Double-diffusive buoyancy effects become significant when the relative ambient velocity is low. Existing melting parameterisations do not reproduce our findings. We propose improvements to capture the influence of aspect ratio on iceberg melting.

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Section: Qualitative Observationsmentioning

confidence: 94%

Aspect ratio affects iceberg melting

Hester,

McConnochie,

Cenedese

et al. 2020

Preprint

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“…For a heated 3D FFS, the continuity, momentum (x, y, and z-momentum) and energy equations are written as follows (Eq. (1) to (5)) See [2][3][4]:…”

Section: Governing Equationsmentioning

confidence: 99%

“…5to create the new transient incompressible solver, pisoTempFoam. The finite volume method (FVM) [2] was used for the discretization of the continuity, momentum and energy equations. The transport equations for turbulence kinetic energy and the dissipation rate of turbulence models k-ε, k-ω, k-ω SST and v 2 -f are available in References [2] and [3].…”

Section: Governing Equationsmentioning

confidence: 99%

“…In the past, several techniques have been developed to simulate complex flow and heat transfer problems in both BFSs and FFSs. Jayakumar, et al [2] carried out numerical analysis on an FFS using the hybrid mesh finite volume CFD code. They used two turbulence models, k-ε and k-ω, and investigated the conjugate heat transfer within an FFS.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Convective Heat Transfer in 3D Forward Facing Step Using Various Turbulence Models

Sarath

Jayakumar

2020

J. Eng. Technol. Sci.

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 Numerical simulations were performed using a newly developed transient solver, pisoTempFoam.  For the k-ɛ and v 2-f turbulence models, the recirculation length in the upstream region increased by 6.97% with an increase in step height.  Increasing Re from 5,000 to 10,000, the recirculation length in the upstream region increased by 48.6% and 49.2% for the k-ω and k-ω SST models, respectively.  As the Prandtl number was increased, the k-ω and k-ω SST models over-predicted the recirculation length in the downstream region.

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“…[12][13][14][15] Thereinto, the hybrid mesh including many different types of element such as tetrahedron, pyramid, and prism, as an improved version of the unstructured mesh, can obtain much higher efficiency and accuracy due to good near-wall region resolving capability. [16][17][18][19] However, the computational investigation based on the hybrid mesh only attracts little attention on the study of film cooling injection. Walters et al 20 conducted the computational study of the aerodynamic impact of film cooling on a linear turbine cascade using a high-quality hybrid mesh comprising hexahedrons, tetrahedrons, prisms, and pyramids.…”

Section: Introductionmentioning

confidence: 99%

Computational study of compound angle film cooling flow field and aerodynamic losses using a parallel hybrid mesh Navier–Stokes code

Luo

Misaka

Obayashi

et al. 2015

Proceedings of the Institution of Mechanical Engineers, Part A:

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Flow characteristics and aerodynamic losses of film cooling injection with compound angles of 30°, 60°, and 90° for velocity ratios of 0.5, 1.0, and 2.0 are numerically investigated using the high-quality hybrid meshes comprising tetrahedrons, prisms, and pyramids. The solutions are obtained by solving the compressible Reynolds-averaged Navier–Stokes equations, and the cell-vertex finite volume method is used to discretize these equations. The predicted results are firstly validated against the experimental data. It has been found that the variation tendency of mass average net total pressure loss coefficient with compound angles is reasonably predicted and in many cases well predicted. The analyses based on net total pressure losses show that the aerodynamic losses tend to increase with the increasing of compound angle regardless of the velocity ratio, and the tendency becomes more obvious when the velocity ratio is large. On the other hand, some typical cases are additionally calculated with different turbulence models and flux computation schemes for the comparisons. A latest proposed numerical flux computation method, simple low-dissipative AUSM (SLAU) scheme, is adopted in the predictions. The results indicate that SLAU scheme is slightly superior to Harten–Lax–van Leer–Einfeldt–Wada scheme in the prediction of compound angle film cooling injection.

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Hybrid mesh finite volume CFD code for studying heat transfer in a forward-facing step

Cited by 7 publications

References 19 publications

Aspect ratio affects iceberg melting

Aspect ratio affects iceberg melting

Simulation of Convective Heat Transfer in 3D Forward Facing Step Using Various Turbulence Models

Computational study of compound angle film cooling flow field and aerodynamic losses using a parallel hybrid mesh Navier–Stokes code

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