Modeling soil-rotavator blade interaction using computational fluid dynamics | |
| Author | Worasit Sangjan |
| Call Number | AIT Thesis no.AE-15-02 |
| Subject(s) | Blades--Computer programs Blades Design Computational fluid dynamics |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Agricultural Systems and Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. AE-15-02 |
| Abstract | Modeling soil - tool interaction is a complicated system caused dynamic soil - implement interaction, which characterized by the flow of soil particles. The working tool of most agricultural implements is a blade which precisely predicting the forces acting on the blade of tillage system is importance in helping to improve productivity. The confirmation of using commercial software Autodesk CFD for creating modeling soil - tool interaction is the motivation for this research . The research was to study the dynamics of soil - tool interaction usin g computational fluid dynamics (CFD) by observing the soil flow pattern as a non - Newtonian material . Soil - bin experiment was created and tested in difference conditions in order to use for comparing the results with the modeling from Autodesk CFD results . The experiment was conducted in Bangkok clay soil at 100, 200, 300 and 400 kPa soil compaction, 10, 12, and 14 cm tilling depth and two rotational speeds of rotavator shaft at 207 and 232 rpm. The soil compaction levels affected torques of the experiment results . Increase in soil compaction was accompanied increase in torque. In the same way, torques levels were also high when increased the tilling depth levels. Moreover, there was no significantly change of torque levels when increased the rotational spe ed of rotavator shaft. A c apillary rheometer was made for evaluating soil parameters for CFD simulations. The equipment was used to find soil yield stress and viscosity at different soil compaction levels. Yield stress and viscosity levels were high when the soil compaction levels increased. The soil and rotavator blade in three - dimensional were modeled using SOLIDWORKS software and transferred to Autodesk CFD for creating simulation models . The conditions of simulation were set same as the soil - bin exper iment conditions. A good correlation was obtained between the simulation model and the experimental results. Torques distribution from modeling soil - rotavator blade agreed well with the soil - bin experimental results. The Autodesk CFD software, in tillage process by using rotavator, demonstrated its greater potential for dynamic modeling of soil - tool interaction. |
| Year | 2015 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. AE-15-02 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Soni, Peeyush |
| Examination Committee(s) | Chaiyaphol Kaewprakaisaengkul;Loc Thai Nguyen |
| Scholarship Donor(s) | Royal Thai Government Fellowship;Asian Institute of Technology Fellowship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2015 |