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| 基于OpenFOAM的猪体空气阻力系数模拟计算 |
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吴雪飞1,2,3,李浩1,2,3*,施正香1,2,3
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| (1.中国农业大学 水利与土木工程学院, 北京 100083;2.农业农村部设施农业工程重点实验室, 北京 100083;3.北京市畜禽健康养殖环境工程技术研究中心, 北京 100083) |
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| 摘要: |
| 为探究气流流速和流向对猪体空气阻力的影响，采用圆柱体气流阻力半经验公式验证和OpenFOAM数值模拟计算风洞中单只猪的空气阻力系数的方法，对不同气流流速(0.2，0.5，1.0，1.5，2.0和2.5 m/s)和猪体长轴与气流流向的夹角(0°，15°，…，180°)不同情况下的空气阻力系数变化规律进行研究。结果表明:1)计算域内合适的网格尺寸能够保证计算结果的稳定性并节约计算资源；2)猪体几何形状对空气阻力的影响不能被忽略，与猪体等体积的圆柱体作为极度简化的猪体模型在表征猪体空气阻力系数方面的相关性较低(R2=0.603 3)；3)猪体与气流流向的夹角为0°~ 45°和135°~180°时猪体阻力系数较小，45°~75°和105°~135°时猪体阻力系数适中，75°~105°时猪体阻力系数较大。本研究阐明了单只猪对气流阻挡作用的规律，同时对OpenFOAM软件在农业通风领域的应用起到了促进作用。 |
| 关键词: OpenFOAM 气流组织 建筑通风 空气流动 |
| DOI：10.11841/j.issn.1007-4333.2021.09.21 |
| 投稿时间：2020-11-30 |
| 基金项目:重庆荣昌农牧高新技术产业研发专项(cstc2019 ngzx0018)；国家自然科学基金项目(32002226) |
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| Simulation of air drag coefficient of pig model based on OpenFOAM |
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WU Xuefei1,2,3,LI Hao1,2,3*,SHI Zhengxiang1,2,3
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| (1.College of Water Resources and Civil Engineering, China Agricultural University, Beijing 100083, China;2.Key Laboratory of Agricultural Engineering in Structure and Environment of Ministry of Agriculture and Rural Affairs, Beijing 100083, China;3.Beijing Research Center for Livestock and Poultry Healthy Environmental Engineering Technology, Beijing 100083, China) |
| Abstract: |
| In order to study the blockage effect of pig under different air velocities and orientations, a semi-empirical correlation of cylinders for validation and OpenFOAM are used to simulate the blockage of a pig model in virtual wind tunnel. A simplified pig model is built to study the blockage effect of a single pig under different air velocities(0. 2, 0. 5, 1. 0, 1. 5, 2. 0, 2. 5 m/s)and orientations(Airflow angle between the main axis of the pig and the airflow, 0°, 15°, …, 180°). The results show that: 1)Simulation in proper grids can both ensure the accurate calculation and reduce the computational load. 2)The geometry difference can not be ignored between pig model and cylinder model that has the same volume as pig model, and the cylinder cannot characterize the law of air resistance coefficient(R2=0. 603 3). 3)The orientations between pig and airflow can be divided into three ranges of 0°-45°and 135°-180°, 45°-75° and 105°-135°, 75°-105°, which represent the small, medium and large air resistance, respectively. This study clarifies the blockage effect of the drag coefficient of a single pig under different airflow velocities and different angles of airflow and promotes the application of OpenFOAM in agricultural engineering. |
| Key words: OpenFOAM air distribution ventilation airflow |
