Effects of different CFD modeling approaches and simplification of shape on prediction of flow field around manikin

Taghinia, Javad; Rahman, Mizanur; Lü, Xiaoshu

doi:10.1016/j.enbuild.2018.03.075

Cited by 22 publications

(15 citation statements)

References 25 publications

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“…Furthermore, the limitations of the Reynolds Averaged Navier-Strokes (RANS) turbulence models (e.g. the standard k-ε model used in this study) in predicting complex flows involving swirls, vortices, locally transitional flows, etc.occurring in room ventilation can also cause some discrepancies[37,51]. On the other hand, the omnidirectional thermal anemometers used in this study are difficult to accurately measure low air velocities[52].…”

mentioning

confidence: 93%

Effects of operation parameters on performances of stratum ventilation for heating mode

Zhang

Lin

et al. 2019

Building and Environment

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Stratum ventilation is more energy-efficient as compared with mixing ventilation for cooling applications. However, due to the short development history of stratum ventilation, few studies on its heating applications are available. The heating operation of stratum ventilation is different from the cooling operation due to the distinct airflow patterns. This study comprehensively investigates the effects of the operation parameters on heating performances of stratum ventilation, using experimentally validated Computational Fluid Dynamics (CFD) simulations. The operation parameters include controllable supply vane angle, supply airflow rate and

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mentioning

confidence: 93%

Effects of operation parameters on performances of stratum ventilation for heating mode

Zhang

Lin

et al. 2019

Building and Environment

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“…Although no single turbulence model can optimally and economically handle all flow elements-e.g., jet flow, momentum-driven flow, stratified flow, and buoyancy-driven flow [30]-there is still a great necessity to utilize more accurate turbulence models or predict the human body microenvironment characterized by a complex flow characteristic. In fact, LES has been applied to predict the microenvironment around a manikin, mostly using simplified geometry [140][141][142]. With increasing computer power, LES may gain popularity for PV studies.…”

Section: Turbulence Modelsmentioning

confidence: 99%

“…Although existing literature has not examined the effect of CTM geometry simplification on PV performance, a few studies have qualified the influence of geometric complexity on an indoor environment, e.g., the shape and size of CTM [144]. One study pointed out that a detailed manikin shape can provide more accurate predictions (4-10%) at some locations, especially those close to the body [141]. Another study revealed that although human body simplification only affected airflow field prediction of the thermal plume regions, it could increase the predictive error of contaminant transport in the whole computational domain [145].…”

Section: Geometry Of Ctmsmentioning

confidence: 99%

A Review of CFD Analysis Methods for Personalized Ventilation (PV) in Indoor Built Environments

et al. 2019

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Computational fluid dynamics (CFD) is an effective analysis method of personalized ventilation (PV) in indoor built environments. As an increasingly important supplement to experimental and theoretical methods, the quality of CFD simulations must be maintained through an adequately controlled numerical modeling process. CFD numerical data can explain PV performance in terms of inhaled air quality, occupants’ thermal comfort, and building energy savings. Therefore, this paper presents state-of-the-art CFD analyses of PV systems in indoor built environments. The results emphasize the importance of accurate thermal boundary conditions for computational thermal manikins (CTMs) to properly analyze the heat exchange between human body and the microenvironment, including both convective and radiative heat exchange. CFD modeling performance is examined in terms of effectiveness of computational grids, convergence criteria, and validation methods. Additionally, indices of PV performance are suggested as system-performance evaluation criteria. A specific utilization of realistic PV air supply diffuser configurations remains a challenging task for further study. Overall, the adaptable airflow characteristics of a PV air supply provide an opportunity to achieve better thermal comfort with lower energy use based on CFD numerical analyses.

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“…Compared with the standard k-ε turbulent model and the Realizable k-ε turbulent model, the RNG k-ε turbulent model can better be able to deal with the multiple complicated flow problems like swirling flow, high strain rate flow, and sharply curved streamline flow. The governing equations of the RNG k-ε turbulent model [47] in the form of a tensor index can be expressed as…”

Section: Governing Equations Of Fluid Domainmentioning

confidence: 99%

Effects of Guide Vane Placement Angle on Hydraulic Characteristics of Flow Field and Optimal Design of Hydraulic Capsule Pipelines

Zhang

Sun

et al. 2018

Water

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With the rapid growth of agricultural trade volumes, the transportation of agricultural products has received widespread attention from society. Aiming at these problems of low transport efficiency and high transport cost in long-distance transport of agricultural products, an energy-saving and environmental-friendly transport mode of agricultural machinery-hydraulic capsule pipelines (HCPs)-was proposed. HCPs effectively solve issues like traffic congestion, energy crises, and atmospheric pollution. Published literature is mainly limited to the capsule speed and the pressure drop characteristics of the fluid within the pipelines. This research was conducted on the following four aspects of HCPs. Firstly, the structure of the carrier was improved and called a 'piped carriage'. Secondly, a coupled solution between the structural domain of the piped carriage and the fluid domain within the pipelines was numerically investigated by using the commercial CFD software ANSYS Fluent 12.0 based on the bidirectional fluid-structure interaction methods. Thirdly, the effects of guide vane placement angle on hydraulic characteristics of the internal flow field within the horizontal pipelines transporting the piped carriage were extensively evaluated. Finally, based on least-cost principle, an optimization model of HCPs was established. The results indicated that the simulated results were in good agreement with the experimental results, which further demonstrated that it was feasible to adopt the bidirectional fluid-structure interaction methods for solving the hydraulic characteristics of the internal flow field when the piped carriage was moving along the pipelines. This article will provide an abundant theoretical foundation for the rational design of HCPs and its popularization and application.

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Effects of different CFD modeling approaches and simplification of shape on prediction of flow field around manikin

Cited by 22 publications

References 25 publications

Effects of operation parameters on performances of stratum ventilation for heating mode

Effects of operation parameters on performances of stratum ventilation for heating mode

A Review of CFD Analysis Methods for Personalized Ventilation (PV) in Indoor Built Environments

Effects of Guide Vane Placement Angle on Hydraulic Characteristics of Flow Field and Optimal Design of Hydraulic Capsule Pipelines

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