【摘要】：工程湍流問(wèn)題中往往存在湍動(dòng)和非湍動(dòng)(即層流)區(qū)域共存的特點(diǎn),而傳統(tǒng)湍流模型假定計(jì)算網(wǎng)格內(nèi)流體總是處于充分湍流狀態(tài),忽視了流動(dòng)中的層流部分,導(dǎo)致模擬的準(zhǔn)確性不足.本文介紹基于能量最小多尺度(Energy Minimization Multi-Scale,EMMS)原理發(fā)展介尺度湍流模型,用于提升工程湍流模擬的預(yù)測(cè)性能;探索湍流中黏性和慣性控制機(jī)制通過(guò)競(jìng)爭(zhēng)中的協(xié)調(diào)形成多尺度結(jié)構(gòu)及穩(wěn)定性條件;分析模型拓展的物理基礎(chǔ)、數(shù)學(xué)表達(dá)及其驗(yàn)證與應(yīng)用.文章初步認(rèn)為,水力學(xué)中的最小和最大能耗率爭(zhēng)論已久,EMMS湍流模型分析兩者的基本假設(shè),進(jìn)而做出統(tǒng)一解釋.最后,展望EMMS湍流模型仍需解決的問(wèn)題以及湍流介尺度方法.
[Abstract]:In engineering turbulence problems, both turbulent and non-turbulent (i.e. laminar) regions often coexist, but the traditional turbulence model assumes that the fluid in the computational grid is always in a sufficient turbulence state and neglects the laminar flow in the flow. The simulation is not accurate enough. In this paper, the mesoscale turbulence model is developed based on the principle of minimum energy multi-scale (Energy Minimization Multi-Scale,EMMS, which is used to improve the prediction performance of engineering turbulence simulation. The viscous and inertial control mechanisms in turbulence are explored to form multi-scale structures and stability conditions through coordination in competition, and the physical basis, mathematical expression, verification and application of the extended model are analyzed. This paper preliminarily holds that the minimum and maximum energy consumption rates in hydraulics have been debated for a long time. The EMMS turbulence model analyzes the basic assumptions of the two models and then makes a unified interpretation. Finally, the problems still to be solved in EMMS turbulence model and the mesoscale method of turbulence are discussed.
【作者單位】： 中國(guó)科學(xué)院過(guò)程工程研究所多相復(fù)雜系統(tǒng)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(編號(hào):91434113,21106155) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(編號(hào):2015CB251402) 中國(guó)科學(xué)院戰(zhàn)略先導(dǎo)科技專項(xiàng)(編號(hào):XDA07080303) 國(guó)防科技創(chuàng)新基金(編號(hào):CXJJ-14-Z72)資助項(xiàng)目
【分類號(hào)】：O357.5
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本文編號(hào)：2310547