本文選題：重力流 + 格子玻爾茲曼��； 參考：《中國農(nóng)村水利水電》2017年01期

【摘要】：對(duì)于重力流管道的空管充水和滿管排空過程,由于邊界條件隨位置和時(shí)間都在變化,用傳統(tǒng)的特征線法較難求解。探索一種新的三維瞬態(tài)模擬方法求解重力流瞬變過程,利用格子玻爾茲曼方法分別模擬重力流管道系統(tǒng)的充水和排空階段。與傳統(tǒng)的系統(tǒng)一維分析方法不同,本次使用的基于介觀模型的格子玻爾茲曼方法根據(jù)流體微觀運(yùn)動(dòng)過程的基本特征建立了管道重力流的時(shí)間和空間離散動(dòng)力學(xué)格子模型,介觀流體粒子的分布和運(yùn)動(dòng)過程遵從動(dòng)力學(xué)統(tǒng)計(jì)定律,對(duì)流場(chǎng)中大量粒子的統(tǒng)計(jì)平均可得到流體的宏觀運(yùn)動(dòng)變量,因此通過該方法能可視化地得出本次研究的管道充水及排空階段的液面變化過程、充滿和排空時(shí)間、進(jìn)口和出口閘閥開啟的流態(tài)變化過程及閥后監(jiān)測(cè)點(diǎn)的壓力、流速變化曲線等。同時(shí)對(duì)相同的管道系統(tǒng)進(jìn)行傳統(tǒng)的一維計(jì)算,并與三維模擬結(jié)果進(jìn)行對(duì)比和驗(yàn)證。利用CFD技術(shù)分析系統(tǒng)級(jí)別的管道流場(chǎng)是一個(gè)創(chuàng)新的研究方向,不但能使結(jié)果精度提高,而且能夠可視化地分析系統(tǒng)內(nèi)需要關(guān)注位置的流場(chǎng)瞬變過程。
[Abstract]:Because the boundary conditions change with the position and time, the traditional characteristic line method is difficult to solve the empty pipe filling and emptying process of gravity flow pipeline.A new three-dimensional transient simulation method is proposed to solve the transient process of gravity flow. The lattice Boltzmann method is used to simulate the filling and emptying stages of gravity flow pipeline system respectively.Different from the traditional one-dimensional analysis method, the lattice Boltzmann method based on mesoscopic model is used to establish the time-space discrete dynamic lattice model of the gravity flow in pipeline according to the basic characteristics of the microscopic motion process of the fluid.The distribution and motion of mesoscopic fluid particles follow the statistical law of dynamics, and the macroscopic motion variables of the fluid can be obtained on average by statistics of a large number of particles in the flow field.Therefore, this method can be used to visualize the process of liquid level change, the filling and emptying time, the flow state change process of inlet and outlet gate valve opening and the pressure at the monitoring point behind the valve in the stage of pipeline filling and emptying.Velocity variation curve, etc.At the same time, the traditional one-dimensional calculation of the same pipeline system is carried out, and compared with the three-dimensional simulation results.It is an innovative research direction to use CFD technology to analyze system-level pipeline flow field. It can not only improve the accuracy of the results, but also visually analyze the transient process of the flow field in the system which needs to pay attention to the position.
【作者單位】： 甘肅省水利廳水利管理局;武漢大學(xué)動(dòng)力與機(jī)械學(xué)院;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51297145) 水利部948項(xiàng)目(201321)
【分類號(hào)】：TV134

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