Test Room for Validation of Airflow Patterns estimated by Computational Fluid Dynamics

Zhang, G.; Morsing, S.; Bjerg, Bjarne; Svidt, Kjeld; Strøm, Jan S.

doi:10.1006/jaer.2000.0538

Cited by 20 publications

(10 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Users and researchers of CFD programs have reported some ‘strange’ results in the past, for e.g. an asymmetry flow pattern is predicted or observed in a symmetric setup where a symmetrical flow is expected (see, for example, Chen and Jiang, 1992; Zhang et al., 2000). In an experimental study by Zhang et al.…”

Section: Introductionmentioning

confidence: 99%

Experimental and CFD evidence of multiple solutions in a naturally ventilated building

Heiselberg

Andersen³

et al. 2003

Indoor Air

View full text Add to dashboard Cite

This paper considers the existence of multiple solutions to natural ventilation of a simple one-zone building, driven by combined thermal and opposing wind forces. The present analysis is an extension of an earlier analytical study of natural ventilation in a fully mixed building, and includes the effect of thermal stratification. Both computational and experimental investigations were carried out in parallel with an analytical investigation. When flow is dominated by thermal buoyancy, it was found experimentally that there is thermal stratification. When the flow is wind-dominated, the room is fully mixed. Results from all three methods have shown that the hysteresis phenomena exist. Under certain conditions, two different stable steady-state solutions are found to exist by all three methods for the same set of parameters. As shown by both the computational fluid dynamics (CFD) and experimental results, one of the solutions can shift to another when there is a sufficient perturbation. These results have probably provided the strongest evidence so far for the conclusion that multiple states exist in natural ventilation of simple buildings. Different initial conditions in the CFD simulations led to different solutions, suggesting that caution must be taken when adopting the commonly used 'zero initialization'.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental and CFD evidence of multiple solutions in a naturally ventilated building

Heiselberg

Andersen³

et al. 2003

Indoor Air

View full text Add to dashboard Cite

show abstract

“…HOFF et al (1992) used this software to model airflow in a rectangular facility, in which heat transfer was modeled using a heated floor. Hereafter, further studies were carried out to validate animal facilities, focusing on providing most accurate CFD models (ZHANG et al, 2000). Only in recent years, there have been developed studies with CFD models to simulate heat and mass transfers throughout a geometric representation, which are applicable in animal production facilities (PAULA et al, 2012;OLIVEIRA et al, 2014).…”

Section: Resultsmentioning

confidence: 99%

Computational Fluid Dynamics (CFD) simulating heated air from wood burning inside a poultries barn

et al. 2016

View full text Add to dashboard Cite

Animal welfare is essential for livestock yield gains, which has been ethically justifiable and socially acceptable. Thus, our research aimed to test computational fluid dynamics model (CFD) to simulate heated air within a poultry barn. Data were simulated in CFD software based on Navier-Stokes equations (geometry of 3 m x 6 m, considering a symmetric mesh). As boundary conditions, a temperature of 38ºC was considered for walls where heating pipe outlets are, to the west side, besides a heat flow of zero, in symmetry to the same side. As for the sides east, south and north, walls were taken as isolated, i.e. heat flow equals to zero. The aviary heating system did not achieve a homogeneous temperature distribution, heat flow, heated air pressure and speed. Heated-air convection cells were spotted in the upper part of the building, being little used for thermal comfort by the birds.

show abstract

“…There is experimental evidence to the contrary in some cases. In an experimental study, Zhang et al [26] has reported asymmetric ow in a symmetric test room meant to produce 2D ow pattern when there is no any obvious disturbance. Fontaine et al [4] observed asymmetric ow behavior both in their water scale model experiment and in their numerical simulations for the IEA Annex-20 nozzle di user.…”

Section: Flow Asymmetry In the Test Roommentioning

confidence: 98%

Modeling of the HESCO nozzle diffuser used in IEA Annex-20 experiment test room

Luo

Roux

2004

Building and Environment

View full text Add to dashboard Cite

Test Room for Validation of Airflow Patterns estimated by Computational Fluid Dynamics

Cited by 20 publications

References 6 publications

Experimental and CFD evidence of multiple solutions in a naturally ventilated building

Experimental and CFD evidence of multiple solutions in a naturally ventilated building

Computational Fluid Dynamics (CFD) simulating heated air from wood burning inside a poultries barn

Modeling of the HESCO nozzle diffuser used in IEA Annex-20 experiment test room

Contact Info

Product

Resources

About