本文選題：CFD　切入點(diǎn)：岸壁效應(yīng)　出處：《大連海事大學(xué)》2016年碩士論文

【摘要】：隨著船舶尺度的逐漸增大,很多航道、港內(nèi)附近水域等變得相對(duì)狹小,成為受限水域。船舶在這些水域所受到的水動(dòng)力和水動(dòng)力矩也發(fā)生了顯著變化,很多專家學(xué)者曾對(duì)此做了大量的研究。本文在前人研究的基礎(chǔ)上,考慮流場(chǎng)的粘性,采用動(dòng)態(tài)重疊網(wǎng)格技術(shù)對(duì)受限水域的岸壁效應(yīng)展開(kāi)了數(shù)值模擬。隨著計(jì)算機(jī)技術(shù)的快速發(fā)展,計(jì)算流體力學(xué)(CFD, Computational Fluid Dynamic)在船舶水動(dòng)力研究中的應(yīng)用越來(lái)越廣泛。隨著船舶粘性阻力計(jì)算方面取得的不斷成功,人們開(kāi)始探討在操縱性數(shù)值研究中考慮流體的粘性。本文基于CFD技術(shù),以系列60船型為研究對(duì)象,通過(guò)求解ANS (Reynolds Averaged Navier-Stokes)方程對(duì)船舶岸壁效應(yīng)進(jìn)行了數(shù)值模擬。其中,網(wǎng)格采用重疊網(wǎng)格技術(shù),湍流模型采用SSTk-ω模型,求解算法采用PISO (Pressure Implicit with Splitting of Operators)算法,自由面的模擬采用單相Level Set方法。本文采用上述方法對(duì)系列60船型在近岸航行的深水和淺水中分別進(jìn)行了數(shù)值計(jì)算。首先假設(shè)船舶靜止不動(dòng),設(shè)置定向來(lái)流,模擬出了船舶的阻力系數(shù)、橫向力系數(shù)和轉(zhuǎn)首力矩系數(shù),并將計(jì)算結(jié)果與他人的計(jì)算結(jié)果進(jìn)行了對(duì)比,吻合度較高。然后放開(kāi)船舶橫蕩、垂蕩和縱搖三個(gè)自由度,對(duì)近岸壁航行的船舶進(jìn)行了數(shù)值計(jì)算,得到了不同岸壁距離下的橫移量,并分析了船速對(duì)其的影響,同時(shí)也研究了不同船速時(shí)船體壓力的變化。本文采用的重疊網(wǎng)格技術(shù),在保證計(jì)算精度的前提下,不僅簡(jiǎn)化了網(wǎng)格的生成,而且在船舶運(yùn)動(dòng)時(shí)只要生成新的網(wǎng)格插值信息即可,無(wú)需重新生成網(wǎng)格,這就大大的減小了工作量和計(jì)算量。本文的計(jì)算方法可以為進(jìn)一步研究限制水域船舶操縱性提供借鑒；計(jì)算結(jié)果可以為駕引人員提供一定的參考,也可以為航道的疏浚、拓寬等提出理論上的建議。
[Abstract]:With the increase of ship scale, many waterways and the waters near the harbor become relatively narrow and become restricted waters.The hydrodynamic force and hydrodynamic moment of ships in these waters have also changed significantly, and many experts and scholars have done a lot of research on it.On the basis of previous studies, considering the viscosity of the flow field, the dynamic overlapping grid technique is used to simulate the shoreline effect in confined waters.With the rapid development of computer technology, computational fluid dynamics (CFD) and Computational Fluid dynamic (Computational Fluid) are widely used in ship hydrodynamic research.With the continuous success of ship viscous resistance calculation, people begin to study the viscosity of fluid in the numerical study of maneuverability.Based on the CFD technique, a series of 60 ship types are studied in this paper. The ship's shoreline effect is numerically simulated by solving the ANS Reynolds Averaged Navier-Stokes equation.Among them, overlapping mesh technology is used in mesh, SSTk- 蠅 model is used in turbulence model, PISO pressure Implicit with Splitting of operators algorithm is used to solve the problem, and single-phase Level Set method is used to simulate free surface.In this paper, a series of 60 ships are numerically calculated in deep water and shallow water by means of the above method.The resistance coefficient, transverse force coefficient and torque coefficient of the ship are simulated, and the calculated results are compared with those of others.Then the ship with three degrees of freedom, namely swinging, swinging and pitching, is numerically calculated, and the transverse movement of the ship at different shore distances is obtained, and the influence of ship speed on it is analyzed.At the same time, the variation of ship pressure at different ship speeds is also studied.The overlapping mesh technology adopted in this paper not only simplifies mesh generation, but also generates new mesh interpolation information while ship is moving, and does not need to be regenerated.This greatly reduces the workload and computation.The calculation method in this paper can be used for reference for further study on the maneuverability of ships in restricted waters, and the calculation results can provide some references for the stewards, as well as theoretical suggestions for the dredging and widening of waterways.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U661

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