基于k-ε模型的实际地形风场CFD模拟研究

CFD SIMULATION OF WIND FARM OVER NATURALTERRAIN BASED ON k-ε MODEL

针对风场的数值模拟,采用标准k-ε湍流模型并修正其模型常数,改进入口边界条件的设置,并自定义基于粗糙度长度的z_0类型壁面函数,保证近地面网格的高分辨率。首先以平板地形为计算模型探索和验证以上方法,然后以实际地形Askervein小山为算例进一步验证其应用到工程领域的可行性,即可作为非线性求解器运用在风电场设计的定向计算中。

Aiming at numerical simulation of wind farm, the standard k-ε turbulence model was used and its model constant was corrected. An approach of inlet boundary conditions was improved, and Z0-type wall function based on the roughness length was defined to ensure the high grid resolution near the ground. Firstly, the calculating model over a flat terrain was used to explore and validate the above methods, and then natural terrain of Askervein hill was used as a calculating example to further validate its application feasibility in engineering field, and it was verified whether the method could be used as a nonlinear solver in directional calculation of wind farm design.