Verifying the reliability of CFD domain decomposition technique on modelling the airflow field inside a naturally ventilated cattle barn

IF 4.4 1区 农林科学 Q1 AGRICULTURAL ENGINEERING
Guoxing Chen, Guoqiang Zhang, Li Rong
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Abstract

Conventionally, the airflow fields outside and inside the naturally ventilated livestock buildings are modelled simultaneously in one computational domain using CFD (Computational Fluid Dynamics). The presence of surrounding buildings, indoor facilities and animals for large scale cattle barns make the required computational power extremely high and even unfordable to achieve simulation results with reasonable accuracy. The Domain Decomposition Technique (DDT), dividing simulations into two separate steps, is an alternative CFD framework to provide sufficient accuracy with affordable computations at each step. The objective of this study was to verify the reliability of DDT on modelling the airflow fields inside a naturally ventilated cattle barn (NVCB) by employing wind tunnel measurements. The exterior airflow fields around the targeted NVCB, which was opened with varying opening ratios, were first simulated to obtain the airflow boundary conditions at sidewall openings by applying exterior wind conditions at the inlet of the computational domain. The interior airflow of the targeted NVCB, were secondly simulated by applying the achieved airflow boundary conditions at sidewall openings from the first step simulation. The interior airflow fields obtained by DDT were in good agreement with wind tunnel measurements. This indicates that DDT can provide an alternative for CFD application in large-scale NVCB with presence of surrounding buildings, indoor facilities and animals, though these had not been considered in this study.
验证 CFD 域分解技术对自然通风牛舍内气流场建模的可靠性
传统上,自然通风牲畜建筑内外的气流场是在一个计算域中使用 CFD(计算流体动力学)同时建模的。由于大型牛舍周围建筑物、室内设施和动物的存在,所需的计算能力极高,甚至无法获得具有合理精度的模拟结果。域分解技术(DDT)将模拟分为两个独立的步骤,是一种可供选择的 CFD 框架,可在每个步骤中以可承受的计算量提供足够的精度。本研究的目的是通过风洞测量,验证 DDT 对自然通风牛舍(NVCB)内部气流场建模的可靠性。首先模拟了以不同开口率打开的目标牛舍周围的外部气流场,通过在计算域入口处应用外部风力条件,获得了侧壁开口处的气流边界条件。然后,应用第一步模拟中获得的侧壁开口处气流边界条件,模拟目标 NVCB 的内部气流。DDT 得出的内部气流场与风洞测量结果非常吻合。这表明 DDT 可作为 CFD 应用于周围有建筑物、室内设施和动物(本研究未考虑这些因素)的大型非易燃易爆场所的替代方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Biosystems Engineering
Biosystems Engineering 农林科学-农业工程
CiteScore
10.60
自引率
7.80%
发文量
239
审稿时长
53 days
期刊介绍: Biosystems Engineering publishes research in engineering and the physical sciences that represent advances in understanding or modelling of the performance of biological systems for sustainable developments in land use and the environment, agriculture and amenity, bioproduction processes and the food chain. The subject matter of the journal reflects the wide range and interdisciplinary nature of research in engineering for biological systems.
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