Coupled radiative-conductive heat transfer problems in complex geometries using embedded boundary method

Zabihi, Milad; Lari, Khosro; Amiri, Hossein

doi:10.1007/s40430-017-0729-5

Cited by 19 publications

(4 citation statements)

References 30 publications

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“…To present the results of the LBM-LBM algorithm and ensure its accuracy, two different geometries are considered, as shown in Figure 7. These figures are usually used as the benchmark to check the performance and validity of results and analyze the outcomes (Amiri et al , 2010; Sun and Zhang, 2018; Zabihi et al , 2017; Bouzgarrou et al , 2017; Zhou et al , 2021).…”

Section: Resultsmentioning

confidence: 99%

Investigation of the lattice Boltzmann method to resolve combined radiation-conduction heat transfer in participating media with curved boundaries

Sharifi,

Siavashi,

Hosseini

2023

HFF

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Purpose Present study aims to extend the lattice Boltzmann method (LBM) to simulate radiation in geometries with curved boundaries, as the first step to simulate radiation in complex porous media. In recent years, researchers have increasingly explored the use of porous media to improve the heat transfer processes. The lattice Boltzmann method (LBM) is one of the most effective techniques for simulating heat transfer in such media. However, the application of the LBM to study radiation in complex geometries that contain curved boundaries, as found in many porous media, has been limited. Design/methodology/approach The numerical evaluation of the effect of the radiation-conduction parameter and extinction coefficient on temperature and incident radiation distributions demonstrates that the proposed LBM algorithm provides highly accurate results across all cases, compared to those found in the literature or those obtained using the finite volume method (FVM) with the discrete ordinates method (DOM) for radiative information. Findings For the case with a conduction-radiation parameter equal to 0.01, the maximum relative error is 1.9% in predicting temperature along vertical central line. The accuracy improves with an increase in the conduction-radiation parameter. Furthermore, the comparison between computational performances of two approaches reveals that the LBM-LBM approach performs significantly faster than the FVM-DOM solver. Originality/value The difficulty of radiative modeling in combined problems involving irregular boundaries has led to alternative approaches that generally increase the computational expense to obtain necessary radiative details. To address the limitations of existing methods, this study presents a new approach involving a coupled lattice Boltzmann and first-order blocked-off technique to efficiently model conductive-radiative heat transfer in complex geometries with participating media. This algorithm has been developed using the parallel lattice Boltzmann solver.

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Section: Resultsmentioning

confidence: 99%

Investigation of the lattice Boltzmann method to resolve combined radiation-conduction heat transfer in participating media with curved boundaries

Sharifi,

Siavashi,

Hosseini

2023

HFF

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“…[16] When the blocked-off method is combined with the discrete ordinates method (DOM) or the finite volume method (FVM) to solve the radiative trans-fer equation (RTE), the complex walls are actually approximated as stair-like boundaries, which brings difficulties in determining the radiative heat flux at the irregular boundaries. Many researches have shown that the obtained radiative heat flux from the blocked-off method is highly oscillating [17,26] as shown in Fig. 1(a).…”

Section: Introductionmentioning

confidence: 99%

“…There are some modifications to this issue, but the outcome is not very satisfactory. [26][27][28][29][30][31] Young Byun et al [17] showed that the multiblock, blocked-off and embedded boundary method can be used to calculate the radiative heat flux on regular walls accurately, while on the irregular wall, the blocked-off method has poor accuracy. Zabihi et al [26] compared the blocked-off method with embedded boundary method for radiative heat flux along the inclined boundary and curved boundary.…”

Section: Introductionmentioning

confidence: 99%

“…[26][27][28][29][30][31] Young Byun et al [17] showed that the multiblock, blocked-off and embedded boundary method can be used to calculate the radiative heat flux on regular walls accurately, while on the irregular wall, the blocked-off method has poor accuracy. Zabihi et al [26] compared the blocked-off method with embedded boundary method for radiative heat flux along the inclined boundary and curved boundary. The results show that both methods produce fluctuations, and the blocked-off method is much worser than the embedded boundary method, leading the heat flux at the circular boundary to fail to be obtained.…”

Section: Introductionmentioning

confidence: 99%

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Calculation of radiative heat flux on irregular boundaries in participating media*

Sun¹,

Zheng²

2020

Chinese Phys. B

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Radiative heat flux at wall boundaries is important for its thermal design. Numerical methods based on structured grids are becoming trendy due to their simplicity and efficiency. Existing radiative transfer equation solvers produce oscillating radiative heat flux at the irregular boundary if they are based on structured grids. Reverse Monte Carlo method and analytical discrete ordinates method are adopted to calculate the radiative heat flux at complex boundaries. The results show that the reverse Monte Carlo method can generate a smooth radiative heat flux profile and it is smoother with larger energy bundles. The results from the analytical discrete ordinates method show that the fluctuations are due to the ray effect. For the total or the mean radiative heat flux, the results from the analytical discrete ordinates method are very close to those from the reverse Monte Carlo method.

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A Planning Model for Predicting Ignition Potential of Complex Fuels in Diurnally Variable Environments

2023

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Coupled radiative-conductive heat transfer problems in complex geometries using embedded boundary method

Cited by 19 publications

References 30 publications

Investigation of the lattice Boltzmann method to resolve combined radiation-conduction heat transfer in participating media with curved boundaries

Investigation of the lattice Boltzmann method to resolve combined radiation-conduction heat transfer in participating media with curved boundaries

Calculation of radiative heat flux on irregular boundaries in participating media*

A Planning Model for Predicting Ignition Potential of Complex Fuels in Diurnally Variable Environments

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