本文選題：橋梁工程　切入點(diǎn)：扁平箱梁　出處：《中國(guó)公路學(xué)報(bào)》2015年06期

【摘要】：為研究二維雷諾時(shí)均Navier-Stokes(RANS)模型在獲取橋梁扁平箱梁漩渦脫落特性時(shí)的可行性,采用基于SSTk-ω湍流模型的二維RANS方程,對(duì)大帶東橋主橋加勁梁進(jìn)行了CFD計(jì)算(雷諾數(shù)Re=1.06×105),獲得了加勁梁在不同迭代時(shí)間步長(zhǎng)、不同網(wǎng)格劃分上的氣動(dòng)力系數(shù)平均值和脈動(dòng)值,以及漩渦脫落Strouhal(Sr)數(shù),突出了計(jì)算時(shí)間步和網(wǎng)格無(wú)關(guān)檢查的重要性。結(jié)果表明:相對(duì)于漩渦脫落周期T,采用較大的時(shí)間步長(zhǎng)就能獲得氣動(dòng)力系數(shù)平均值的近似估計(jì),而要獲得漩渦脫落Sr數(shù)的收斂估計(jì)之計(jì)算時(shí)間步長(zhǎng)應(yīng)小于T/260;采用二維RANS模型能獲得此種箱梁平均氣動(dòng)力系數(shù)的近似估計(jì),但得到的漩渦脫落Sr數(shù)與風(fēng)洞試驗(yàn)結(jié)果有較大差別。
[Abstract]:In order to study the feasibility of the two-dimensional Reynolds averaged Navier-Stokescan-RANS model in obtaining the vortex shedding characteristics of the bridge flat box girder, the two-dimensional RANS equation based on the SSTk- 蠅 turbulence model is adopted.The CFD calculation of the stiffened beam of the main bridge of the large belt east bridge is carried out (Reynolds number Re=1.06 脳 105). The average and pulsating values of aerodynamic coefficients and the vortex shedding of the stiffened beam are obtained in different iteration time steps, different mesh division, and the number of vortex shedding.The importance of computing time step and grid independent checking is highlighted.The results show that relative to the period T of vortex shedding, the approximate estimation of the mean value of aerodynamic coefficient can be obtained by using a large time step.In order to obtain convergence estimation of vortex shedding Sr number, the calculating time step should be smaller than T / 260. The approximate estimation of the average aerodynamic coefficient of box girder can be obtained by using two-dimensional RANS model, but the calculated vortex shedding Sr number is quite different from the wind tunnel test results.
【作者單位】： 湖南大學(xué)土木工程學(xué)院;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(51278191) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(“九七三”計(jì)劃)項(xiàng)目(2015CB057702)
【分類號(hào)】：U441.3

【二級(jí)參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 祝志文;顧明;陳政清;;兩自由度系統(tǒng)氣彈響應(yīng)特性研究[J];工程力學(xué);2008年08期

【相似文獻(xiàn)】

相關(guān)期刊論文 前1條

1 孫芳錦;殷志祥;張大明;;漩渦脫落引起的懸索橋耦合顫振分析[J];鋼結(jié)構(gòu);2008年06期

，

本文編號(hào)：1722370