Vertical axis wind turbines (VAWTs) can be suitably installed in urban regions. Although the power performance is essential, the noise generated by a VAWT may influence the living environment. An accurate prediction of power and noise performance is therefore necessary. In the present study, a precise aerodynamic and aeroacoustic performance assessment of a Darrieus VAWT is accomplished with the aim of exploring the effect of solidity parameter using a high-fidelity method. The improved delayed detached eddy simulation (IDDES) and the Ffowcs Williams and Hawkings (FW-H) acoustic analogy approaches have been utilized for predicting flow field and noise level. The simulations were performed in three different solidities at a specific tip speed ratio (TSR). It is shown that changing the solidity parameter affects both power and noise level remarkably. Change in the aerodynamic performance mostly occurs due to variation in instantaneous effective angle of attack which comprises many detailed discussions. The lower the solidity the higher the value of effective angle of attack. The noise level also affects by changing solidity as consequence of flow field variation. It is discussed here how the noise level would alter in terms of solidity, TSR, distance and azimuth angle. As the solidity increases, the sound pressure level (SPL) at blade pass frequency increases. Since design of quieter VAWT with application in urban regions recently is of the most interest and importance therefore such deep studies could appropriately address hybrid criteria and be helpful in future investigations.

垂直轴风力涡轮机（VAWT）可以适当地安装在城市地区。尽管功率性能至关重要，但是VAWT产生的噪声可能会影响居住环境。因此，有必要对功率和噪声性能进行准确的预测。在本研究中，完成了对Darrieus VAWT的精确空气动力学和空气声学性能评估，目的是探索使用高保真度方法对固体参数的影响。改进的延迟分离涡模拟（IDDES）和Ffowcs Williams和Hawkings（FW-H）声学模拟方法已被用于预测流场和噪声水平。在特定的叶尖速度比（TSR）下，在三种不同的实体中执行了模拟。结果表明，改变硬度参数会显着影响功率和噪声水平。空气动力学性能的变化主要是由于瞬时有效攻角的变化而引起的，其中包括许多详细的讨论。硬度越低，有效攻角的值越高。流场变化的结果是，噪声强度也会因改变固体而受到影响。这里讨论了噪声水平将如何改变，如坚固性，TSR，距离和方位角。随着坚固性的增加，叶片通过频率处的声压级（SPL）会增加。由于近来设计更安静的VAWT及其在城市地区的应用是最受关注和重要的，因此，这种深入的研究可以适当地解决混合标准，并在将来的研究中有所帮助。