Numerical Simulation Of Flow Field And Temperature Field In Mechanical Ventilation Greenhouse Based On Ansys

Greenhouse is one of the high gardening establishment for planting. Today, greenhouse is required not only to preserve heat in winter but also can control the temperature in summer. Natural ventilation and mechanical ventilation are two main ways for the greenhouse cooling. Mechanical ventilation is extensive using in our country because of the good cooling effect and controlling temperature automatically. Therefore, the research of numerical simulation of mechanical ventilation plays an important pole in the development of our country's greenhouse.The method of numerical simulation comprises finite difference method, finite volume method, finite element method and finite analytic method. This thesis regards taking the self-made greenhouse model as the research object, builds a mathematical model of the greenhouse, obtains control equation set of flowing, and controls the differential equation set to carry on dispersedly in the compute field. Adopting the large-scale finite element analysis software ANSYS to carry on the numerical simulation to the flowing field and temperature field inside of the model greenhouse and obtaining the border condition value by measuring obtain distribution information of the velocity of the air and the temperature inside of the greenhouse.By comparing and verifying the measurement data with results of the simulation, it can imply that the calculation value of velocity field is approximately close to the testing value. Because the measurement of velocity field is influenced by external condition and unavoidably error of the survey tools, partial calculation values of the velocity are quite different from the testing data. The variation tendency of the simulation value of temperature field is hopefully coincident with the testing value and their values are relatively close, and the average relative error is limited to 1%, so it can be quite good to reflect the real temperature field condition in the greenhouse. Test compare with result indicate software flow field to greenhouse and simulation that temperature field is distribute it calculates to be comparatively success with ANSYS, can utilize this method to predict the climate environment in the greenhouse. By the numerical simulation validation of velocity distribution and temperature field, it is indicated that adopting ANSYS in the numerical simulation of the greenhouse is feasible, and the method can be used in the future work.