Three-dimensional multi-physics simulation based on actual geometry of bio-materials

2014 Fiscal Year Final Research Report

• Project/Area Number: 25660206
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Agricultural environmental engineering/Agricultural information engineering
• Research Institution: Kyushu University
• Principal Investigator: TANAKA FUMIHIKO 九州大学, (連合)農学研究科(研究院), 准教授 (30284912)
• Co-Investigator(Kenkyū-buntansha): HAMANAKA Daisuke 鹿児島大学, 農学部, 准教授 (60399095) ; UCHINO Toshitaka 九州大学, 大学院農学研究院, 教授 (70134393) ; TAGAWA Akio 千葉大学, 園芸学研究科, 名誉教授 (90216804)
• Project Period (FY): 2013-04-01 – 2015-03-31
• Keywords: シミュレーション工学 / 生体材料 / 農業工学 / X線CT / 共焦点レーザ顕微鏡

Outline of Final Research Achievements

The objectives of this study were to obtain a series of two-dimensional images of plant tissues, to reconstruct three-dimensional geometry of plant tissue based on data obtained by using X-ray CT or confocal laser scanning microscopy systems, and to model heat and mass transfer in three-dimensional reconstructed geometries. The values of thermal diffusivity were found to be 1.46×10-7, 2.05×10-7, 2.11×10-7 m2s-1 for flesh, seed and calyx, respectively. The gas diffusivities for ethane were 6.0×10-8, 8.0×10-8, 1.0×10-7 m2s-1 for 5, 15 and 25 oC, respectively. The combined effect of heat and mass transfer was programed in the software and the internal changes of temperature and CO2 concentrations were simulated with the model. We also found out that the CT value was related to the density of persimmon flesh. As for a cell structure reconstruction based on CLSM images, the prediction of heat transfer in cell tissue was carried out and the temperature distribution was visualized.

Free Research Field

農学