Abstract
Problem statement: Rotating turbine ventilators were generally found in most countries. They were simple in structure, light in weight and cheap to install. It was quite surprising that, the aerodynamics of this common device had not been numerically examined and the design process of most of these ventilators had developed progressively through trial and error methods. Approach: This study was concerned with performing simulation of airflow using CFD technique code name FLUENT so as to visualize the flow behavior around and within a rotating turbine ventilator in addition to determining the aerodynamic forces acting on this device during its operation. To achieve that, the realizable k-e and RSM turbulence models were used by taking advantage of moving mesh method to simulate the rotation of turbine ventilator and the consequent results were obtained through the sequential process which ensured accuracy of the computations. Results: The results confirmed that, the realizable k-e model can exhibit a reasonable performance, however not as competence as the RSM model, but of much less computation time. Conclusion/Recommendations: Results from this study, besides ensuring the reliability of utilizing the CFD method in design process of future turbine ventilators, would lead us to a conspicuous progress on increasing the efficiency at reduced cost of wind driven ventilators and similar devices.
Highlights
Many Southeast Asian countries have experienced high economic growth accompanied by rapid urbanization over the last few decades
The results of computations in this direction as it is illustrated in Fig. 12 shows that, both turbulence models
The sequential course of simulation exhibit a constant trend in entire range of velocity and with a precise consideration of important parameters supports the flow visualization outcome once again
Summary
Many Southeast Asian countries have experienced high economic growth accompanied by rapid urbanization over the last few decades. In passive wind driven ventilation category, devices and methods are passive in nature and primarily use wind-induced effects as motive forces for providing ventilation. When wind blows on the aerofoil vanes the resultant lift and drag forces cause the turbine to rotate This rotation produces a negative pressure inside the turbine which extracts air. The Standard k-ε model, which is the most common method applied in the majority of CFD applications, cannot accurately simulate the flow separation region that occurs at the tips of the rotating blades. This can lead to significant errors in the overall analysis (Cochran, 2004). The Realizable k-ε model which satisfies certain mathematical constraints on the Reynolds stresses, consistent with the physics of the turbulent flows and RSM model, which provides a physically realistic and accurate prediction of the flow field for computation of turbulent flow in turbine rotor blades, are chosen to be the appropriate models of choice for this study (Lakshminarayana, 1996)
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