DNS OF SEPARATED FLOW AND HEAT TRANSFER AND AN EXPLORATION OF TURBULENCE MODELING

流传热分离的 DNS 及湍流建模探索

• 批准号: 09650218
• 负责人: OTA Terukazu
• 金额: $ 1.98万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650218/
• 关键词: SEPARATED FLOW; REATTACHED FLOW; TURBULENT HEAT TRANSFER; DNS; TURBULENCE MODELING; BLUNT FLAT PLATE; 鈍頭平枝

The Direct Numerical Simulation (DNS) of a separated flow around a blunt flat plate and heat transfer has been conducted. Further, the Large Eddy Simulation (LES) With the Dynamic Smagorinsky Model (DSM) are made at Re = 11600 and 50000. A three-dimensional unsteady flow and heat transfer around a surface-mounted hexahedron was analyzed using the DNS.Main results obtained are summarized as follows.In the case of a two-dimensional flow, DNS was carried out for Re = 1000 and Pr 0.7. The separated shear layer rolls up as forming the vortices, and they coalesce into a large scale vortex, which is almost periodically shed from the reattachment region to the downstream.The time averaged Nusselt number reaches the maximum a little upstream of the reattachment point.The maximum of Nusselt number is formed under the large scale vortex, where the heat transfer is instantaneously promoted.In the case of a three-dimensional flow, the DNS results agree well with the previous measured data.LES results for Re = 11600 and 50000 predict well the detailed mechanisms of the separated flow and heat transfer described above. They also agree well with the measured data.The DSM predicts well the complicated flow and heat transfer mechanism of the separated flow.The separated flow and heat transfer around a surface mounted hexahedron were analyzed using the DNS method. The results clarified an important role of the horseshoe vortex formed around the hexahedron.

已经进行了钝平板和传热的分离流的直接数值模拟（DNS）。此外，在RE = 11600和50000中进行具有动态Smagorinsky模型（DSM）的大型涡流模拟（LES）。使用DNS进行了dns cans and flats car car car car car car car car and prof。分离的剪切层随着涡流形成涡流而卷成大规模的涡流，几乎经常从重新安装区域到下游脱落。尼塞尔特平均数量达到的最大时间达到了最大的上游重新提升点。流量，DNS结果与先前的测量数据非常吻合。RE = 11600和50000的LES结果很好地预测了上述分离流量和热传递的详细机制。他们也与测量的数据很好地吻合。DSM很好地预测了分离流动流的复杂流量和传热机理。使用DNS方法分析了围绕表面固定的六面体的分离流和传热。结果阐明了六面体周围形成的马蹄形漩涡的重要作用。

项目成果

Ota, T., Nakajima, M.and Yanaoka, H.: "Numerical Analysis of Two-dimensional Unsteady Laminar Flow and Heat Transfer around a Rectangular Cylinder on a Surface" Trans.JSME. 64B-617. 226-231 (1998)

Ota, T.、Nakajima, M. 和 Yanaoka, H.：“二维非定常层流和表面矩形圆柱体周围传热的数值分析”Trans.JSME。

Okamoto R.and Ota T.: "Large Eddy Simulation of Turbulent Heat Transfer Over a Blunt Flat Plate" Trans.JSME. 63B-608. 1344-1350 (1997)

Okamoto R. 和 Ota T.：“钝平板上湍流传热的大涡模拟”Trans.JSME。

太田 照和・中島 円・柳岡 英樹: "平面上突起物まわりの二次元非定常流れと熱伝達の数値解析" 日本機械学会論文集B編. 64・617. 226-231 (1998)

Teruwa Ota、Maru Nakajima 和 Hideki Yanagioka：“平面突出物周围二维非定常流动和传热的数值分析”，日本机械工程师学会汇刊，B 版 64, 617. 226-231 (1998)。 ）

M.Nakajima & T.Ota: "Numerical Simulation of Three Dimensional Unsteady Flow and Heat Transfer around a Surface-Mounted Hexahedron in a Channel" Heat Transfer 1998, Proc.11th IHTC. 3. 133-138 (1998)

中岛先生

Okamoto R.and Ota T.: "Large Eddy Simulation of Turbulent Separated and Reattached Flow Over a Blunt Flat Plate" Trans.JSME. 63B-605. 175-181 (1997)

Okamoto R. 和 Ota T.：“钝平板上湍流分离和再附着流的大涡模拟”Trans.JSME。