| Research is conducted on the numerical simulation and optimized design for mechanical ventilation of barn. Based on the experiment and three-dimension model of mechanical ventilation of barn, appropriate two-dimension simplified model, mathematical model and numerical method are proposed. The RNG k ?εturbulent model, the finite volume method (FVM) and the porous jump model are utilized for simulating the evolution progress of the complex flows in the underground ventilation trough of barn.The present research is divided into three parts: setting up two- dimension simplified model of underground ventilation trough of bungaloid barn, validating the possibility of the two-dimension model after the comparison with numerical results obtained by three-dimension model as well as model experiment; proposing new shape of underground trough to improve the efficiency of ventilation in it, using the two- dimension simplified model to simulate the ventilation in with or without the new shape, and concluding that the new shape is not practicable after analyzing the numerical results; utilizing the two-dimension simplified model to optimized the shape of the entrance belongs to... |
