Consideration of CFD Analysis Accuracy of Box Fan

S. Tomimatsu, C. Kato
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Abstract

This CFD benchmark activity for a box fan has been conducted through the Industrial Committee for Supercomputing Promotion (ICSCP) and the Fan Noise Prediction Working Group from the “Promotion of Practical Use of HPC in Turbomachinery” Subcommittee established in the Turbomachinery Society of Japan. In this benchmark activity, various CFD software has been used. In this study, ANSYS CFX 18.2 is used and the difference in results are investigated by changing the turbulence model and the mesh model. The results between the k-epsilon model and the Shear Stress Transport (SST) model show a reverse trend. That is to say, the k-epsilon model overestimates the pressure difference at the high flow range and the SST model underestimates it at the low flow range compared with the experimental result. In order to improve these numerical results, CFD analysis is conducted by changing mesh models. The number of the blade surface mesh, and the initial height, height ratio, and number of prism layers are changed, but there is no improvement through these approaches. In this paper, CFD verification and validation are conducted for the box fan.
箱式风机CFD分析精度的考虑
本次箱形风机CFD基准测试活动由日本涡轮机械学会下属的超级计算推广工业委员会(ICSCP)和“高性能计算在涡轮机械中的实际应用推广”分会下属的风机噪声预测工作组进行。在本次基准测试活动中,使用了多种CFD软件。本研究使用ANSYS CFX 18.2,通过改变湍流模型和网格模型来研究结果的差异。k-epsilon模型与剪切应力输运(SST)模型的结果呈相反趋势。也就是说,与实验结果相比,k-epsilon模型高估了大流量范围内的压差,而SST模型低估了小流量范围内的压差。为了改进这些数值结果,通过改变网格模型进行CFD分析。通过改变叶片表面网格数、初始高度、高度比和棱镜层数,这些方法都没有改善。本文对箱式风机进行了CFD验证和验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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