本文關(guān)鍵詞： 粘勢流耦合 OpenFOAM Helmholtz速度分解定理 SUBOFF光體　出處：《中國造船》2017年01期 　論文類型：期刊論文

【摘要】：針對SUBOFF光體繞流問題,根據(jù)Helmholtz速度分解定理將流場速度分解為勢流部分和非勢流部分,代入到N-S方程推導(dǎo)得到耦合勢流速度的關(guān)于非勢流速度的控制方程,其中勢流部分速度采用數(shù)值方法預(yù)先求得,非勢流部分控制方程的表達(dá)與N-S方程一致,可直接采用傳統(tǒng)N-S方程的計(jì)算方法求解。文中在Open FOAM平臺內(nèi)實(shí)現(xiàn)了SUBOFF繞流問題的粘勢流耦合計(jì)算,通過對不同來流速度下的SUBOFF繞流的計(jì)算模擬,并將耦合方法計(jì)算獲得的流場中的速度、壓力等,與文獻(xiàn)中試驗(yàn)結(jié)果以及傳統(tǒng)計(jì)算流體動力學(xué)(CFD)等計(jì)算的結(jié)果進(jìn)行仔細(xì)比較和分析,相關(guān)結(jié)果吻合良好。流場中的非勢流部分速度分量在遠(yuǎn)場較小,甚至趨于0,論文分析考察了較傳統(tǒng)CFD方法計(jì)算范圍小的區(qū)域,將粘勢流耦合方法與傳統(tǒng)CFD方法進(jìn)行了計(jì)算研究和對比。研究表明,粘勢流耦合方法對區(qū)域大小不敏感,可以采用更小的計(jì)算區(qū)域,同時提高計(jì)算效率;該方法適用于繞流問題的計(jì)算模擬,為改善CFD計(jì)算效率提供了新的途徑。
[Abstract]:According to the Helmholtz velocity decomposition theorem, the velocity of the flow field is decomposed into the potential flow part and the non-potential flow part. The governing equation about the non-potential flow velocity of coupled potential flow velocity is derived by substitution of N-S equation, in which the partial velocity of potential flow is obtained in advance by numerical method. The expression of the partial governing equation of non-potential flow is consistent with that of N-S equation. The traditional N-S equation can be solved directly. In this paper, the visco-potential flow coupling calculation of the SUBOFF flow around the SUBOFF is realized on the Open FOAM platform. The velocity and pressure in the flow field obtained by the coupling method are calculated by the simulation of the flow around SUBOFF at different incoming velocities. The results are compared and analyzed carefully with the experimental results in literature and those calculated by conventional computational fluid dynamics (CFDs). The correlation results are in good agreement with each other. The non-potential flow partial velocity components in the flow field are smaller in the far field. Even toward zero, the paper analyzes and inspects the region which is smaller than the traditional CFD method, and studies and compares the viscous potential flow coupling method with the traditional CFD method. The visco-potential flow coupling method is not sensitive to the size of the region, so it can use a smaller calculation area and improve the computational efficiency. This method is suitable for the simulation of flow around the flow and provides a new way to improve the efficiency of CFD calculation.
【作者單位】： 上海交通大學(xué)船舶海洋與建筑工程學(xué)院海洋工程國家重點(diǎn)實(shí)驗(yàn)室高新船舶與深海開發(fā)裝備協(xié)同創(chuàng)新中心;
【基金】：973項(xiàng)目(2014CB046203) 國家自然科學(xué)基金資助項(xiàng)目(51579147,51479117)
【分類號】：O357.5
【正文快照】： 在許多水動力學(xué)問題中,粘性起著非常重要的作用,但考慮粘性的影響會使問題變得相當(dāng)復(fù)雜。勢流理論是忽略流體粘性并假定流體流動無旋的基礎(chǔ)上發(fā)展起來的,可以準(zhǔn)確估算粘性影響較弱的各種水動力學(xué)問題,如波浪傳播、船體移動興波等各類問題。在粘性影響較為顯著的物理問題上勢流，

本文編號：1486088