Articles
Comparison of various crop models in greenhouse CFD model design: porous medium model and 3-dimensional crop structure model
Article number
1426_62
Pages
449 – 454
Language
English
Abstract
Many CFD studies on greenhouses have been conducted, and various models have been developed to realize greenhouses.
Initially, it was simply implemented as a limitation of technology, but as software and hardware technologies developed, it became possible to reflect more details.
However, until recently, in most greenhouse CFD models, crop models were designed as porous medium models.
The porous medium is a state where there are many small holes on the surface or inside.
It can be designed by simplifying a model with a complex internal shape.
According to previous studies, the CFD model using the porous medium model was also able to simulate the temperature, humidity, and air flow of the greenhouse with high accuracy.
However, the porous medium model cannot implement the crop surface temperature which is important for crop growth, and there is a limit to the evaporation and transpiration amount.
Also, it is difficult to analyze the degree of natural light and the air flow rate near the crops.
Therefore, in this study, the difference was analyzed by designing a porous medium model and a 3-dimensional crop structure model for tomatoes that have been studied a lot based on previous research.
Comparing airflow of porous media model and developed tomato model, airflow in porous media volume was formed upward because porous media was a resistor in every space.
Whereas air flow in developed tomato shape model was formed through the tomato crop colony.
And comparing temperature, temperature distribution was also formed upward in porous media volume by airflow.
Temperature distribution was also formed upward in porous media volume by airflow.
But, in tomato shape model, the distribution was formed through the tomato crop colony.
Initially, it was simply implemented as a limitation of technology, but as software and hardware technologies developed, it became possible to reflect more details.
However, until recently, in most greenhouse CFD models, crop models were designed as porous medium models.
The porous medium is a state where there are many small holes on the surface or inside.
It can be designed by simplifying a model with a complex internal shape.
According to previous studies, the CFD model using the porous medium model was also able to simulate the temperature, humidity, and air flow of the greenhouse with high accuracy.
However, the porous medium model cannot implement the crop surface temperature which is important for crop growth, and there is a limit to the evaporation and transpiration amount.
Also, it is difficult to analyze the degree of natural light and the air flow rate near the crops.
Therefore, in this study, the difference was analyzed by designing a porous medium model and a 3-dimensional crop structure model for tomatoes that have been studied a lot based on previous research.
Comparing airflow of porous media model and developed tomato model, airflow in porous media volume was formed upward because porous media was a resistor in every space.
Whereas air flow in developed tomato shape model was formed through the tomato crop colony.
And comparing temperature, temperature distribution was also formed upward in porous media volume by airflow.
Temperature distribution was also formed upward in porous media volume by airflow.
But, in tomato shape model, the distribution was formed through the tomato crop colony.
Publication
Authors
S.M. Kang, S.Y. Lee, J.G. Kim, D.H. Park, S.H. Kim, I.B. Lee
Keywords
computational fluid dynamics (CFD), crop model, greenhouse, porous medium, 3-dimensional crop structure
Groups involved
- Division Precision Horticulture and Engineering
- Division Greenhouse and Indoor Production Horticulture
- Working Group Nettings in Horticulture (subgroup of Protected Cultivation in Mild Winter Climates)
- Working Group Light in Horticulture
- Working Group Organic Greenhouse Horticulture
- Working Group Vegetable Grafting
- Working Group Modelling Plant Growth, Environmental Control, Greenhouse Environment
- Working Group Protected Cultivation, Nettings and Screens for Mild Climates
- Working Group Computational Fluid Dynamics in Agriculture
- Working Group Design and Automation in Integrated Indoor Production Systems
- Working Group Mechanization, Digitization, Sensing and Robotics
- Working Group Greenhouse Environment and Climate Control
- Division Landscape and Urban Horticulture
- Commission Agroecology and Organic Farming Systems
- Division Vegetables, Roots and Tubers
- Working Group Vertical Farming
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