...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Aeronautical Journal >Prediction of laminar, transitional and turbulent flow regimes, based on three-equation k-ω turbulence model
【24h】

Prediction of laminar, transitional and turbulent flow regimes, based on three-equation k-ω turbulence model

机译：基于三方程k-ω湍流模型的层流，过渡和湍流状态预测

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A recently developed transitional model for boundary-layer flows has been examined on a flat plate and the well-known S809 wind turbine blade. Proposed numerical model tries to simulate streamwise fluctuations, induced by freestream turbulence, in pre-transitional boundary-layer flows by introducing an additional transport equation for laminar kinetic energy term. This new approach can be used for modeling of transitional flows which are exposed to both the freestream turbulence intensity and streamwise pressure gradient, which are known as the most dominant factors in occurrence of transition. Computational method of this model is based on the solution of the Reynolds averaged Navier-Stokes (RANS) equations and the eddy-viscosity concept. The model includes three transport equations of laminar kinetic energy, turbulent kinetic energy and dissipation rate frequency. The present model is capable of predicting either natural or bypass transitional mechanisms, which may occur in attached boundary-layer flows. In addition, the model can simulate transition in the separated free shear layers and the subsequent turbulent re-attachment to form a laminar separation bubble. Flat plate was exposed to different freestream turbulence intensities and streamwise pressure gradients. Wind turbine blade was examined under two different Reynolds numbers, with one of them suitable for the occurrence of laminar separation bubbles on its surfaces. To evaluate the performance of this new model in resolving transitional boundary-layer flows, final results have been compared to those obtained through application of conventional turbulence models. Comparison of final results for the flat plate and the S809 aerofoil with available experimental data show very close agreements.
机译：在平板和众所周知的S809风力涡轮机叶片上检查了最近开发的边界层流过渡模型。拟议的数值模型试图通过引入层流动能项的附加输运方程来模拟过渡前边界层流中由自由流湍流引起的流向波动。这种新方法可用于过渡流的建模，该过渡流暴露于自由流湍流强度和沿流方向的压力梯度中，这被认为是发生过渡的最主要因素。该模型的计算方法基于雷诺平均Navier-Stokes（RANS）方程和涡流粘度概念的求解。该模型包括层流动能，湍动能和耗散率频率的三个输运方程。本模型能够预测自然的或旁路的过渡机制，这可能发生在附着的边界层流中。另外，该模型可以模拟分离的自由剪切层中的过渡以及随后的湍流重新附着以形成层状分离泡。平板暴露于不同的自由流湍流强度和沿流的压力梯度。在两个不同的雷诺数下检查了风力涡轮机叶片，其中之一适合于在其表面上出现层状分离气泡。为了评估该新模型在解决过渡边界层流方面的性能，已将最终结果与通过应用常规湍流模型获得的结果进行了比较。将平板和S809机翼的最终结果与可用的实验数据进行比较显示出非常接近的一致性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号