Application of polyhedral meshing strategy in indoor environment simulation: Model accuracy and computing time

Chen, Haofu; Zhou, Xiaoqing; Feng, Zhuangbo; Cao, Shi-Jie

doi:10.1177/1420326x211027620

Cited by 27 publications

(17 citation statements)

References 31 publications

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“…The polyhedral meshes would produce a superior performance (model accuracy and computing time) for indoor environment simulations and show great potential in engineering applications. 63…”

Section: Methodsmentioning

confidence: 99%

“…Equation (8), the traditional y+ formula was used for approximation. 63 uτ is the wall friction velocity and is defined by equation (9)where μ is the dynamic viscosity of the fluid, ρ is the density of the fluid and τw is the wall shear stress. In the trial simulation, only the average wall shear stress for each wall can be extracted to provide a reference for the selections of relevant parameters of the wall prism layer.…”

Section: Methodsmentioning

confidence: 99%

“…Equation ( 8), the traditional y þ formula was used for approximation. 63 u τ is the wall friction velocity and is defined by equation ( 9)…”

Section: Methods For Wall Mesh Treatmentmentioning

confidence: 99%

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A semi-empirical mesh strategy for CFD simulation of indoor airflow

Liu

Long

Liu

2022

Indoor and Built Environment

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Proper meshing is critical for accurate computational fluid dynamics (CFD) simulation. In the three stages of CFD simulation, pre-processing accounts for about 40–60% of the total time. In this study, the performance of the grid for a large number of numerical simulations was analyzed, and base mesh sizes were recommended for different indoor geometric models. The simulation results for temperature, velocity, mesh resolution and computation time were compared, and mesh types were recommended for different models. Considering factors such as wall function, wall y+, face quality of the mesh, grid volume change rate and prism layer setting, a semi-empirical mesh strategy was presented. This strategy was verified in three cases with different geometric complexity. The verification results showed that the mesh strategy can yield reasonable simulation results. The root-mean-square error of the velocity simulation results of the optimized grid can be reduced by nearly 20%. This strategy can save nearly 50% of the mesh adjustment time. Through analysis and fitting of the grid results, the evaluation criteria for this mesh strategy were obtained. The criteria can be used to evaluate the cases using this mesh strategy.

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“…The polyhedral meshes would produce a superior performance (model accuracy and computing time) for indoor environment simulations and show great potential in engineering applications. 63…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

A semi-empirical mesh strategy for CFD simulation of indoor airflow

Liu

Long

Liu

2022

Indoor and Built Environment

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“…The tetrahedral grid is the simplest element and has the advantage of being relatively easily generated automatically compared to other grids. However, a polyhedral grid was used to obtain accurate results and to reduce the analysis time [ 25 ]. As a polyhedral mesh, the parts other than the main part were set as the growth rate to create slightly relaxed grids.…”

Section: Methodsmentioning

confidence: 99%

Numerical Investigation of Overtopping Prevention for Optimal Safety Dike Design

Son

Kim

Min

et al. 2022

IJERPH

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Leakage accidents at chemical facilities have a negative impact on both the environment and human life, and the government has established and implemented regulations on dikes in order to minimize such accidents. However, the overtopping phenomenon in which chemicals overflow the dike due to catastrophic leakage requires additional safeguards. In this study, the mitigation effect was confirmed by simulating tanks and dikes using various deflector plates to minimize the effect of spilled chemicals. ANSYS Fluent 19.1, a computational fluid dynamics program, was used, and the overtopping effect was compared with a dike design that satisfies the safety regulations using a volume of fluid (VOF) model that analyzes multiphase flow through a surface tracking technique. Nitric acid and sulfuric acid were used in the study; they were selected because they are frequently involved in leakage accidents. In the event of a leak in a liquid tank, a dike with a deflector plate was very effective in reducing overtopping, and a deflector at a 45° angle was more effective than a 30° deflector. However, it is necessary to install additional safeguards at the joint between the dike and the deflection plate to withstand the force of the liquid.

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“…To study the airflow and contaminant distributions in an airplane cabin under different ventilation systems, either experimental measurements or computational fluid dynamics (CFD) simulations are commonly used [ 9 ]. Compared with experimental methods, CFD modeling is more efficient, and it can be used to analyze multiple cases at low cost [ 10 ]. However, it is challenging to accurately simulate airflow and contaminant transmission in an airplane cabin by CFD because of the complex geometry and flow pattern and the approximations used in the modeling method [ 11 ].…”

Section: Introductionmentioning

confidence: 99%