An immersed boundary method to conjugate heat transfer problems in complex geometries. Application to an automotive antenna

Favre, Federico; Antepara, Oscar; Oliet, C.; Lehmkuhl, O.; Segarra, Carlos David Pérez

doi:10.1016/j.applthermaleng.2018.11.099

Cited by 14 publications

(4 citation statements)

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“…The newly adapted mesh is obtained from an input mesh through some geometrical manipulations: operations of refinement and coarsening until a maximum level of refinement is achieved. This methodology is a further step to extend our previous work about the development of AMR algorithms on hexahedral meshes 54,56,57,59,60 to tetrahedral meshes for the solution of computational fluid dynamics problems on complex domains.…”

Section: Adaptive Mesh Refinement For Tetrahedral Meshesmentioning

confidence: 99%

Tetrahedral adaptive mesh refinement for two‐phase flows using conservative level‐set method

Antepara

Balcázar²,

Oliva

2020

Numerical Methods in Fluids

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SummaryIn this article, we describe a parallel adaptive mesh refinement strategy for two‐phase flows using tetrahedral meshes. The proposed methodology consists of combining a conservative level‐set method with tetrahedral adaptive meshes within a finite volume framework. Our adaptive algorithm applies a cell‐based refinement technique and adapts the mesh according to physics‐based refinement criteria defined by the two‐phase application. The new adapted tetrahedral mesh is obtained from mesh manipulations of an input mesh: operations of refinement and coarsening until a maximum level of refinement is achieved. For the refinement method of tetrahedral elements, geometrical characteristics are taking into consideration to preserve the shape quality of the subdivided elements. The present method is used for the simulation of two‐phase flows, with surface tension, to show the capability and accuracy of 3D adapted tetrahedral grids to bring new numerical research in this context. Finally, the applicability of this approach is shown in the study of the gravity‐driven motion of a single bubble/droplet in a quiescent viscous liquid on regular and complex domains.

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Section: Adaptive Mesh Refinement For Tetrahedral Meshesmentioning

confidence: 99%

Tetrahedral adaptive mesh refinement for two‐phase flows using conservative level‐set method

Antepara

Balcázar²,

Oliva

2020

Numerical Methods in Fluids

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“…The reader is referred to as [2] for further details on the adaptive mesh refinement algorithm applied to this paper. Furthermore, our hexahedral AMR algorithm has been validated with numerical results from the literature, including LES of turbulent flows around bluff bodies [2] , atomization of a liquid-gas jet [53,54] , and as local mesh refinement for conjugate heat transfer problems [28] .…”

Section: Adaptive Mesh Refinementmentioning

confidence: 99%

Numerical study of rising bubbles with path instability using conservative level-set and adaptive mesh refinement

Antepara

Balcázar²,

Rigola

et al. 2019

Computers & Fluids

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“…The applications are almost countless and cover a wide range of industries. For example, the cooling of electronic components [2][3][4][5], which must provide more and more power in ever-smaller spaces, and efficiency improvements cannot fully compensate for the increasing heat generation. In addition to forced convection, natural convection plays a major role, for example, in devices intended for domestic use because fans should be avoided due to their undesirable noise emission and power consumption.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Conjugate Heat Transfer and Natural Convection Using the Lattice-Boltzmann Method for Realistic Thermophysical Properties

Landl

Prieler

Monaco

et al. 2023

Fluids

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To enable the lattice-Boltzmann method (LBM) to account for temporally constant but spatially varying thermophysical properties, modifications must be made. Recently, many methods have emerged that can account for conjugate heat transfer (CHT). However, there still is a lack of information on the possible physical property range regarding realistic properties. Therefore, two test cases were investigated to gain further insight. First, a differentially heated cavity filled with blocks was used to investigate the influence of CHT on the error and stability of the LBM simulations. Reference finite volume method (FVM) simulations were carried out to estimate the error. It was found that a range between 0.5 to 1.5 is recommended for the fluid relaxation time to balance computational effort, stability, and accuracy. In addition, realistic thermophysical properties of fluids and solids were selected to test whether the lattice-Boltzmann method is suitable for simulating relevant industry-related applications. For a stable simulation, a mesh with 64 times more lattices was needed for the most extreme test case. The second test case was an insulated cavity with a heating pad as the local heat source, which was investigated in terms of the accuracy of a transient simulation and compared to a FVM simulation. It was found that the fluid-phase relaxation time mainly determines the error and that large thermal relaxation times for the solid improve accuracy. Observed deviations from the FVM reference simulations ranged from approximately 20% to below 1%, depending on collision operator and combination of relaxation times. For processes with a large temperature spread, the temporally constant thermophysical properties of the LBM are the primary constraint.

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An immersed boundary method to conjugate heat transfer problems in complex geometries. Application to an automotive antenna

Abstract: Portal del coneixement obert de la UPC http://upcommons.upc.edu/e-prints Aquesta és una còpia de la versió author's final draft d'un article publicat a la revista Applied Thermal Engineering.

Cited by 14 publications

References 50 publications

Tetrahedral adaptive mesh refinement for two‐phase flows using conservative level‐set method

Tetrahedral adaptive mesh refinement for two‐phase flows using conservative level‐set method

Numerical study of rising bubbles with path instability using conservative level-set and adaptive mesh refinement

Numerical Investigation of Conjugate Heat Transfer and Natural Convection Using the Lattice-Boltzmann Method for Realistic Thermophysical Properties

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