本文關(guān)鍵詞：基于OpenFOAM的正弦形沙丘表面流場(chǎng)特性研究　出處：《上海理工大學(xué)學(xué)報(bào)》2017年04期 　論文類型：期刊論文

  更多相關(guān)文章： 計(jì)算流體力學(xué) 正弦形沙丘 湍流 速度轉(zhuǎn)變 網(wǎng)格敏感性

【摘要】：基于開源計(jì)算流體力學(xué)軟件OpenFOAM,對(duì)沙丘表面流場(chǎng)進(jìn)行數(shù)值模擬,將所得到的沙丘表面風(fēng)速分布與野外觀測(cè)結(jié)果進(jìn)行對(duì)比,驗(yàn)證數(shù)值模擬的準(zhǔn)確性.在此基礎(chǔ)上,獲得了距沙丘表面不同高度的速度分布曲線和沙丘表面上的速度矢量場(chǎng),探討了數(shù)值模擬結(jié)果對(duì)計(jì)算網(wǎng)格的敏感性,考察了沙丘寬高比對(duì)流場(chǎng)特性的影響.結(jié)果表明:OpenFOAM的標(biāo)準(zhǔn)k-ε模型能夠預(yù)測(cè)低矮正弦形沙丘表面流場(chǎng)的速度轉(zhuǎn)變特性;在貼近沙丘表面的內(nèi)層,沙丘表面特定高度處的速度分布曲線相對(duì)于沙丘輪廓存在相位提前,隨著高度的增加,相位提前量減少,速度變化趨于平緩;網(wǎng)格數(shù)目對(duì)外層速度分布影響較小,但對(duì)內(nèi)層的速度分布則有重要影響;足夠多的網(wǎng)格數(shù)目是獲得精確的沙丘表面流場(chǎng)信息的必要條件,在沙丘流場(chǎng)數(shù)值模擬中應(yīng)當(dāng)引起重視;保持沙丘寬度不變,隨著沙丘寬高比的減小,沙丘表面速度分布曲線的相位提前量變大,背風(fēng)坡出現(xiàn)回流區(qū),寬高比越小,回流區(qū)的長度與強(qiáng)度越大.
[Abstract]:Open source based on computational fluid dynamics software OpenFOAM, numerical simulation of the surface flow of sand dunes, dune surface wind velocity distribution are compared with the field observation results, verify the accuracy of numerical simulation. On this basis, obtained from the dune surface of different height speed distribution curve and the sand dunes on the surface of the velocity vector field, are discussed the results of numerical simulation on the sensitivity of the computing grid, the effects of aspect ratio on flow field characteristics of the sand dunes. The results show that the speed of the standard k- e OpenFOAM model can predict the low sinusoidal surface flow of sand dunes change characteristics; in the inner layer close to the surface of sand dunes, dune surface specific height velocity distribution curve relative to the dune contour phase in advance, with the increase of height, reduce the amount of phase advance, speed change gently; the outer layer of grid number velocity distribution has little influence, but It has an important effect on the velocity distribution of the inner layer; enough grid number is a necessary condition to obtain accurate information on surface flow of sand dunes, dune field in numerical simulation should be paid more attention; keep the dune width is constant, with the decrease of the width of the sand dunes, dune surface phase velocity distribution curve ahead of quantity, Lee appeared the recirculation zone, the aspect ratio is small, the length and strength of recirculation zone increases.

【作者單位】： 上海理工大學(xué)能源與動(dòng)力工程學(xué)院;上海理工大學(xué)上海市動(dòng)力工程多相流動(dòng)與傳熱重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51206113,51176128,51576130) 上海市科委科研計(jì)劃項(xiàng)目(13DZ2260900)
【分類號(hào)】：O35
【正文快照】： 2.上海理工大學(xué)上海市動(dòng)力工程多相流動(dòng)與傳熱重點(diǎn)實(shí)驗(yàn)室,上海200093)沙丘是指由于沙粒在流場(chǎng)中相互作用所形成的堆積體,常見于海岸、河谷和干旱沙漠地帶.沙丘表面流場(chǎng)決定著局地沙粒輸運(yùn)的強(qiáng)度,從而影響沙丘的形態(tài),在沙丘演變動(dòng)力學(xué)研究中占據(jù)重要地位,因而備受研究者關(guān)注[1-

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