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Computational fluid dynamics(CFD) simulation of effect of baffles on separation in mixer settler 被引量:13
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作者 Mohsen Ostad Shabani Ali Mazahery +4 位作者 Mehdi Alizadeh Ali Asghar Tofigh Mohammad Reza Rahimipour Mansour Razavi Alireza Kolahi 《International Journal of Mining Science and Technology》 SCIE EI 2012年第5期703-706,共4页
The main ideas in the development of the solvent extraction mixer settler focused on achieving clean phase separation,minimizing the loss of the reagents and decreasing the surface area of the settlers.The role of baf... The main ideas in the development of the solvent extraction mixer settler focused on achieving clean phase separation,minimizing the loss of the reagents and decreasing the surface area of the settlers.The role of baffles in a mechanically agitated vessel is to ensure even distribution,reduce settler turbulence,promote the stability of power drawn by the impeller and to prevent swirling and vortexing of liquid,thus,greatly improving the mixing of liquid.The insertion of the appropriate number of baffles clearly improves the extent of liquid mixing.However,excessive baffling would interrupt liquid mixing and lengthen the mixing time.Computational fluid dynamics(CFD) provides a tool for determining detailed information on fluid flow(hydrodynamics) which is necessary for modeling subprocesses in mixer settler.A total of 54 final CFD runs were carried out representing different combinations of variables like number of baffles,density and impeller speed.CFD data shows that amount of separation increases with increasing baffles number and decreasing impeller speed. 展开更多
关键词 Mixer settler computational fluid dynamics Liquid-liquid Efficiency
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A simplified approach to modelling blasts in computational fluid dynamics (CFD) 被引量:2
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作者 D.Mohotti K.Wijesooriya S.Weckert 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2023年第5期19-34,共16页
This paper presents a time-efficient numerical approach to modelling high explosive(HE)blastwave propagation using Computational Fluid Dynamics(CFD).One of the main issues of using conventional CFD modelling in high e... This paper presents a time-efficient numerical approach to modelling high explosive(HE)blastwave propagation using Computational Fluid Dynamics(CFD).One of the main issues of using conventional CFD modelling in high explosive simulations is the ability to accurately define the initial blastwave properties that arise from the ignition and consequent explosion.Specialised codes often employ Jones-Wilkins-Lee(JWL)or similar equation of state(EOS)to simulate blasts.However,most available CFD codes are limited in terms of EOS modelling.They are restrictive to the Ideal Gas Law(IGL)for compressible flows,which is generally unsuitable for blast simulations.To this end,this paper presents a numerical approach to simulate blastwave propagation for any generic CFD code using the IGL EOS.A new method known as the Input Cavity Method(ICM)is defined where input conditions of the high explosives are given in the form of pressure,velocity and temperature time-history curves.These time history curves are input at a certain distance from the centre of the charge.It is shown that the ICM numerical method can accurately predict over-pressure and impulse time history at measured locations for the incident,reflective and complex multiple reflection scenarios with high numerical accuracy compared to experimental measurements.The ICM is compared to the Pressure Bubble Method(PBM),a common approach to replicating initial conditions for a high explosive in Finite Volume modelling.It is shown that the ICM outperforms the PBM on multiple fronts,such as peak values and overall overpressure curve shape.Finally,the paper also presents the importance of choosing an appropriate solver between the Pressure Based Solver(PBS)and Density-Based Solver(DBS)and provides the advantages and disadvantages of either choice.In general,it is shown that the PBS can resolve and capture the interactions of blastwaves to a higher degree of resolution than the DBS.This is achieved at a much higher computational cost,showing that the DBS is much preferred for quick turnarounds. 展开更多
关键词 Blast loads computational fluid dynamics Explosions Numerical simulations
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基于CFD的燃煤锅炉协同处置含油污泥方案设计
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作者 张凡志 郑德水 +3 位作者 张海丹 李卫平 方仙明 张光学 《锅炉技术》 北大核心 2025年第2期23-30,共8页
针对含油污泥产量高、危害大及处理困难等特点,设计了采用燃煤锅炉进行协同焚烧处置的技术方案,对含油污泥进行加热、除杂、配比及均匀化后,由喷枪雾化后形成50~150μm的液滴,送入炉膛燃烧。采用计算流体力学对设计方案进行验证及优化... 针对含油污泥产量高、危害大及处理困难等特点,设计了采用燃煤锅炉进行协同焚烧处置的技术方案,对含油污泥进行加热、除杂、配比及均匀化后,由喷枪雾化后形成50~150μm的液滴,送入炉膛燃烧。采用计算流体力学对设计方案进行验证及优化。结果表明:当喷枪布置在主燃区中下位置时,油泥液滴能够穿透至炉膛内部,避免贴壁燃烧引起的壁面温度高、还原性气氛强等问题。由于掺烧比例低、油泥热值与煤粉接近,因此不同的布置方案均不会影响整体炉膛内温度场分布特性。当喷枪布置在主燃区中间位置时,四周水冷壁表面的氧气体积分数较高,避免了高温腐蚀风险。从煤粉燃尽率来看,掺烧含油污泥后,不同的方案均能够降低飞灰含碳量,当喷枪布置在主燃区中间位置时,不同负荷下油泥对煤粉燃尽率的影响均较小。经过数值模拟分析后认为,采用大型燃煤锅炉进行含油污泥协同处置,最优方案是将雾化喷枪布置在主燃区中部二次风喷口附近。 展开更多
关键词 含油污泥 燃煤锅炉 协同处置 掺烧 计算流体力学
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基于CFD−DPM的空气幕协同排风罩增效除尘研究
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作者 丁厚成 许婉萍 +2 位作者 邓权龙 陈圳杨 朱强 《安徽工业大学学报(自然科学版)》 2025年第1期62-71,共10页
以某机械厂打磨车间为研究对象,利用Solidworks软件建立带有空气幕协同排风罩除尘的打磨车间模型,基于气固两相流理论,采用计算流体力学离散颗粒模型(CFD−DPM)模拟分析空气幕送风速度、射流角度和射流宽度对除尘效率的影响,选取空气幕... 以某机械厂打磨车间为研究对象,利用Solidworks软件建立带有空气幕协同排风罩除尘的打磨车间模型,基于气固两相流理论,采用计算流体力学离散颗粒模型(CFD−DPM)模拟分析空气幕送风速度、射流角度和射流宽度对除尘效率的影响,选取空气幕的最优参数;在此基础上,对比分析未开启排风罩、开启排风罩、同时开启排风罩与空气幕3种工况的风速分布、粉尘运移轨迹及粉尘质量浓度分布,探讨空气幕协同排风罩除尘的效果。结果表明:粉尘最大浓度、呼吸带粉尘浓度随空气幕送风速度、射流宽度的增大而减小,但不随空气幕射流角度的变化而变化;粉尘浓度随地面高度的增大先增后减,不同高度处粉尘浓度变化趋势基本一致;当空气幕射流宽度30 mm、射流角度30°、送风速度3 m/s时,通风除尘效果最佳,除尘效率高达94.2%。相比于仅开启排风罩,排风罩与空气幕协同作用下的除尘效率提高了38.8%,空气幕协同排风罩对车间除尘具有较好的增效作用。 展开更多
关键词 打磨车间 金属粉尘 排风罩 空气幕 计算流体力学(cfd) 离散颗粒模型(DPM) 除尘 职业健康
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Modeling of gas-solid flow in a CFB riser based on computational particle fluid dynamics 被引量:7
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作者 Zhang Yinghui Lan Xingying Gao Jinsen 《Petroleum Science》 SCIE CAS CSCD 2012年第4期535-543,共9页
A three-dimensional model for gas-solid flow in a circulating fluidized bed(CFB) riser was developed based on computational particle fluid dynamics(CPFD).The model was used to simulate the gas-solid flow behavior ... A three-dimensional model for gas-solid flow in a circulating fluidized bed(CFB) riser was developed based on computational particle fluid dynamics(CPFD).The model was used to simulate the gas-solid flow behavior inside a circulating fluidized bed riser operating at various superficial gas velocities and solids mass fluxes in two fluidization regimes,a dilute phase transport(DPT) regime and a fast fluidization(FF) regime.The simulation results were evaluated based on comparison with experimental data of solids velocity and holdup,obtained from non-invasive automated radioactive particle tracking and gamma-ray tomography techniques,respectively.The agreement of the predicted solids velocity and holdup with experimental data validated the CPFD model for the CFB riser.The model predicted the main features of the gas-solid flows in the two regimes;the uniform dilute phase in the DPT regime,and the coexistence of the dilute phase in the upper region and the dense phase in the lower region in the FF regime.The clustering and solids back mixing in the FF regime were stronger than those in the DPT regime. 展开更多
关键词 Gas-solid flow circulating fluidized bed computational particle fluid dynamics modeling HYDROdynamics
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Computational Fluid Dynamics Based Bulbous Bow Optimization Using a Genetic Algorithm 被引量:5
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作者 Shahid Mahmood Debo Huang 《Journal of Marine Science and Application》 2012年第3期286-294,共9页
Computational fluid dynamics (CFD) plays a major role in predicting the flow behavior of a ship. With the development of fast computers and robust CFD software, CFD has become an important tool for designers and eng... Computational fluid dynamics (CFD) plays a major role in predicting the flow behavior of a ship. With the development of fast computers and robust CFD software, CFD has become an important tool for designers and engineers in the ship industry. In this paper, the hull form of a ship was optimized for total resistance using CFD as a calculation tool and a genetic algorithm as an optimization tool. CFD based optimization consists of major steps involving automatic generation of geometry based on design parameters, automatic generation of mesh, automatic analysis of fluid flow to calculate the required objective/cost function, and finally an optimization tool to evaluate the cost for optimization. In this paper, integration of a genetic algorithm program, written in MATLAB, was carried out with the geometry and meshing software GAMBIT and CFD analysis software FLUENT. Different geometries of additive bulbous bow were incorporated in the original hull based on design parameters. These design variables were optimized to achieve a minimum cost function of "total resistance". Integration of a genetic algorithm with CFD tools proves to be effective for hull form ootimization. 展开更多
关键词 bulbous bow genetic algorithm computational fluid dynamics cfd total resistance
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基于EFD和CFD组合方法的肥大船型功率预报研究
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作者 高旋 高玉玲 陈伟民 《中国航海》 北大核心 2025年第1期150-156,共7页
对三种肥大船型不同载况下形状因子(1+k)的确定方法及其适应性开展研究,探讨建立基于模型试验流体动力学(EFD)和计算流体动力学(CFD)组合方法的肥大船型实船功率预报方法。以某肥大型散货船为主要研究对象,分别采用模型试验和数值模拟... 对三种肥大船型不同载况下形状因子(1+k)的确定方法及其适应性开展研究,探讨建立基于模型试验流体动力学(EFD)和计算流体动力学(CFD)组合方法的肥大船型实船功率预报方法。以某肥大型散货船为主要研究对象,分别采用模型试验和数值模拟方法确定形状因子并进行对比分析,然后采用EFD和CFD组合方法进行实船性能预报。研究表明:基于CFD获取形状因子并结合模型试验进行肥大船型功率预报,结果与实船试航结果比较接近且在误差允许范围内,验证基于EFD和CFD组合方法预报实船航速功率具有实用性和可行性。 展开更多
关键词 模型试验流体动力学 计算流体动力学 模型试验与数值计算组合方法 形状因子 实船功率预报
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Computational fluid dynamics simulation of formaldehyde emission characteristics and its experimental validation in environment chamber 被引量:2
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作者 刘志坚 《Journal of Chongqing University》 CAS 2010年第3期124-132,共9页
We investigated the effect of supply air rate and temperature on formaldehyde emission characteristics in an environment chamber.A three-dimensional computational fluid dynamics(CFD) chamber model for simulating forma... We investigated the effect of supply air rate and temperature on formaldehyde emission characteristics in an environment chamber.A three-dimensional computational fluid dynamics(CFD) chamber model for simulating formaldehyde emission in twelve different cases was developed for obtaining formaldehyde concentration by the area-weighted average method.Laboratory experiments were conducted in an environment chamber to validate the simulation results of twelve different cases and the formaldehyde concentration was measured by continuous sampling.The results show that there was good agreement between the model prediction and the experimental values within 4.3 difference for each case.The CFD simulation results varied in the range from 0.21 mg/m3 to 0.94 mg/m3,and the measuring results in the range from 0.17 mg/m3 to 0.87 mg/m3.The variation trend of formaldehyde concentration with supply air rate and temperature variation for CFD simulation and experiment measuring was consistent.With the existence of steady formaldehyde emission sources,formaldehyde concentration generally increased with the increase of temperature,and it decreased with the increase of air supply rate.We also provided some reasonable suggestions to reduce formaldehyde concentration and to improve indoor air quality for newly decorated rooms. 展开更多
关键词 formaldehyde concentration environment chamber computational fluid dynamics simulation supply air rate TEMPERATURE
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A computational fluid dynamics investigation of a novel flooded-bed dust scrubber with vibrating mesh 被引量:1
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作者 Zhaokuan Lu Aishwarya Rath +2 位作者 Seyed Hassan Amini Aaron Noble Shima Shahab 《International Journal of Mining Science and Technology》 SCIE EI CAS CSCD 2022年第3期525-537,共13页
This work proposes a vibrating mesh screen as an alternative to the static mesh screen currently used in conventional flooded-bed dust scrubbers for removing airborne coal mine dust in the continuous mining environmen... This work proposes a vibrating mesh screen as an alternative to the static mesh screen currently used in conventional flooded-bed dust scrubbers for removing airborne coal mine dust in the continuous mining environment.Fundamental assessments suggest that a vibrating screen may improve the dust collection efficiency of scrubber systems and mitigate the clogging issues associated with the conventional design.To evaluate this hypothesis,computational fluid dynamics(CFD)simulations were carried out to assess the effects of vibration conditions(i.e.,frequency and amplitude)on the dust particle-mesh interaction and mesh wetting conditions,which are the two decisive factors in determining the dust collection efficiency.The results suggest that the vibrating mesh screen can enhance dust particle collision opportunities on the mesh and increase mesh wetted area as compared to the static mesh screen.The effects of mesh screen aperture,coal dust concentration,and spray nozzle flow rate on the performance of the vibrating mesh are also evaluated.Finally,a simplified three-phase flow simulation including airflow,dust particles,and water droplet spray is performed,and the results reflect a significant improvement of dust collection efficiency in the liquid-coated vibrating mesh screen. 展开更多
关键词 Dust control Air filtration Flooded-bed scrubber Vibrating mesh filter Continuous miner computational fluid dynamics Multiphase flow
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Computational fluid dynamics simulation of Hyperloop pod predicting laminar–turbulent transition 被引量:2
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作者 Nathalie Nick Yohei Sato 《Railway Engineering Science》 2020年第1期97-111,共15页
Three-dimensional compressible flow simulationswere conducted to develop a Hyperloop pod. Thenovelty is the usage of Gamma transition model, in whichthe transition from laminar to turbulent flow can be predicted.First... Three-dimensional compressible flow simulationswere conducted to develop a Hyperloop pod. Thenovelty is the usage of Gamma transition model, in whichthe transition from laminar to turbulent flow can be predicted.First, a mesh dependency study was undertaken,showing second-order convergence with respect to themesh refinement. Second, an aerodynamic analysis for twodesigns, short and optimized, was conducted with thetraveling speed 125 m/s at the system pressure 0.15 bar.The concept of the short model was to delay the transitionto decrease the frictional drag;meanwhile that of theoptimized design was to minimize the pressure drag bydecreasing the frontal area and introduce the transitionmore toward the front of the pod. The computed resultsshow that the transition of the short model occurred moreon the rear side due to the pod shape, which resulted in 8%smaller frictional drag coefficient than that for the optimizedmodel. The pressure drag for the optimized designwas 24% smaller than that for the short design, half ofwhich is due to the decrease in the frontal area, and theother half is due to the smoothed rear-end shape. The totaldrag for the optimized model was 14% smaller than that forthe short model. Finally, the influence of the systempressure was investigated. As the system pressure and theReynolds number increase, the frictional drag coefficientincreases, and the transition point moves toward the front,which are the typical phenomena observed in the transitionregime. 展开更多
关键词 computational fluid dynamics(cfd) Drag SUBSONIC COMPRESSIBLE flow Hyperloop Laminar-turbulent TRANSITION
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Flow Field and Temperature Field in GaN-MOCVD Reactor Based on Computational Fluid Dynamics Modeling 被引量:1
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作者 梅书哲 王权 +8 位作者 郝美兰 徐健凯 肖红领 冯春 姜丽娟 王晓亮 刘峰奇 徐现刚 王占国 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第9期82-86,共5页
Metal organic chenlical vapor deposition (AIOCVD) growth systems arc one of the. main types of equipment used for growing single crystal materials, such as GaN. To obtain fihn epitaxial materials with uniform perfor... Metal organic chenlical vapor deposition (AIOCVD) growth systems arc one of the. main types of equipment used for growing single crystal materials, such as GaN. To obtain fihn epitaxial materials with uniform performanee, the flow field and ternperature field in a GaN-MOCVD reactor are investigated by modeling and simulating. To make the simulation results more consistent with the actual situation, the gases in the reactor are considered to be compressible, making it possible to investigate the distributions of gas density and pressure in the reactor. The computational fluid dynamics method is used to stud,v the effects of inlet gas flow velocity, pressure in the reactor, rotational speed of graphite susceptor, and gases used in the growth, which has great guiding~ significance for the growth of GaN fihn materials. 展开更多
关键词 MOCVD Flow Field and Temperature Field in GaN-MOCVD Reactor Based on computational fluid dynamics Modeling GAN
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Computational Fluid Dynamics Simulation of Liquid-Phase FCC Diesel Hydrotreating in Tubular Reactor 被引量:1
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作者 Li Hua Liu Ningqiang +2 位作者 Zeng Zhiyu Zou Ying Wang Jiming 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2015年第4期102-110,共9页
The computational fluid dynamics(CFD) code, FLUENT, was used to simulate the liquid-phase FCC diesel hydrotreating tubular reactor with a ceramic membrane tube dispenser. The chemical reaction and reaction heat were a... The computational fluid dynamics(CFD) code, FLUENT, was used to simulate the liquid-phase FCC diesel hydrotreating tubular reactor with a ceramic membrane tube dispenser. The chemical reaction and reaction heat were added to the model by user-defined function(UDF), showing the distribution of temperature and content of sulfides, nitrides, bicyclic aromatics and monocyclic aromatics in different parts of the reaction bed. When the pressure was 6.5 MPa, the amount of mixing hydrogen was 0.84%(m), the space velocity was 2 h-1 and the inlet temperature was 633 K, the temperature reached a maximum at a height of 0.15 m, and the range of radial temperature reached its maximum(2.5 K) at a height of 0.15 m. It indicated that the proper ratio of height to diameter of catalyst bed in the tubular reactor was 5-6. The increase of inlet temperature, the mixing hydrogen and the decrease of space velocity led to the decrease in the content of bicyclic aromatics, sulfides and nitrides, and the increase in monocyclic aromatics content, while the high temperature increased. The results were in good agreement with experimental data, indicating to the high accuracy of the model. 展开更多
关键词 FCC diesel tubular liquid-phase hydrogenation computational fluid dynamicscfd
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突变风下车-桥系统三分力系数演化规律的CFD分析
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作者 肖洋 何旭辉 《铁道科学与工程学报》 北大核心 2025年第2期723-733,共11页
为研究突变风作用下车-桥系统三分力非定常特性问题,以某大桥工程为背景,采用ANSYS Fluent有限元软件建立流线型箱梁和钝体和谐号列车精细化二维数值模型,基于UDF在模型速度入口设置6种突变风工况,分析不同加速度和有无初速度作用下的车... 为研究突变风作用下车-桥系统三分力非定常特性问题,以某大桥工程为背景,采用ANSYS Fluent有限元软件建立流线型箱梁和钝体和谐号列车精细化二维数值模型,基于UDF在模型速度入口设置6种突变风工况,分析不同加速度和有无初速度作用下的车-桥系统三分力及其系数演化规律。通过与均匀流对照,研究结果表明:在各突变风工况中,车-桥系统在加速初始和结束时刻会出现阻力跃升和跃跌,这可能与加速度的有无相关,其中流线型箱梁在加速过程中出现阻力超冲现象,超冲系数值最大可达4.1,而钝体列车超冲系数值维持在1.0~1.1,基本无阻力超冲现象。此外,比之无初速工况,有初速会降低阻力超冲系数值。3个气动力系数均出现显著的非定常特性,在加速初段,升力系数C_(L)(t)、阻力系数C_(D)(t)和扭矩系数C_M(t)波动幅度大,加速后段逐步平稳,回到均匀流相应水平。其中无初速的工况车-桥系统三分力系数非定常效应比有初速工况更为明显。在不同加速度的工况之间,非定常效应也存在差异性,对于有初速的突变风工况,在一定范围内,车-桥系统三分力系数非定常效应随着加速度的增大而增大,而对于无初速的工况则随着加速度的增大而减小。可见,有无初速度和加速度的大小是影响突变风下车-桥系统三分力系数非定常特性的因素。研究结果可为突变风作用的气动力非定常特性研究和高速列车行车安全性提供一定参考。 展开更多
关键词 突变风 车-桥系统 超冲系数 三分力系数 非定常效应 cfd
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Computational fluid dynamics of left ventricular assist device under unsteady flow
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作者 BUMRUNGPETCH J. TAN A.C. 《排灌机械工程学报》 EI CSCD 北大核心 2016年第2期93-98,共6页
Left ventricular assist device( LVAD) in this study is a mechanical tool that is used to support blood flow in the patient with heart disease. It supports left ventricle by building up the pressure to the pump outlet ... Left ventricular assist device( LVAD) in this study is a mechanical tool that is used to support blood flow in the patient with heart disease. It supports left ventricle by building up the pressure to the pump outlet connected to the aorta. This pump was designed based on the magnetic driven centrifugal pump with a unique small washout hole constructed inside the impeller to generate the washout flow passage to prevent the stagnation at the region underneath and around the rotor. Computational fluid dynamics( CFD) was adopted in this study to assess the performance and optimize the design to avoid recirculation and high shear stress which is the main cause of stagnation and blood damage. Transient simulation was used for this study due to the asymmetric design of the washout hole and the complication of the bottom support of the impeller that has a risk of thrombosis,also,it was used to predict the variation of hydraulic performance caused by the rotation of the impeller and pulsed flow at the pump inlet. The simulation results show no excessive stress and no recirculation observed within the computational domain; in addition,the research result also provides information for further optimization and development to the pump. 展开更多
关键词 heart pump left ventricular assist device computational fluid dynamics unsteady flow
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基于CFD-CSM双向耦合的柔性水平板防波堤水动力特性研究
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作者 刘佳安 王心玉 +2 位作者 贾奥 姜胜超 林旻 《水道港口》 2025年第1期40-50,共11页
基于计算流体动力学(CFD)与计算固体力学(CSM)的分区双向耦合模拟方法,发展了波浪与柔性水平板防波堤相互作用的耦合分析模型,采用文献中的试验数据验证流固耦合模型的合理性,利用数值算例分析柔性水平板防波堤的水动力特性。研究表明:... 基于计算流体动力学(CFD)与计算固体力学(CSM)的分区双向耦合模拟方法,发展了波浪与柔性水平板防波堤相互作用的耦合分析模型,采用文献中的试验数据验证流固耦合模型的合理性,利用数值算例分析柔性水平板防波堤的水动力特性。研究表明:柔性水平板防波堤和刚性水平板防波堤的反射系数均随着相对板宽(B/L=0.26~0.62)的增加先增大后减小,透射系数则反之;柔性水平板防波堤的掩护性能随着弹性模量(E=20~100 MPa)的降低先增强后减弱,通过选取合理的设计参数,柔性水平板防波堤相较于刚性水平板防波堤具有更好的掩护性能;在文中计算条件下,当E=80 MPa时柔性水平板防波堤达到最佳的掩护性能。 展开更多
关键词 流固耦合 数值模拟 柔性水平板防波堤 水动力特性 计算流体力学 VOF
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基于CFD的某动车所检查库通风降温方案比选研究
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作者 张济辞 王胜男 +2 位作者 周璐 李颖谦 邬春木 《高速铁路技术》 2025年第2期70-75,98,共7页
以成都某新建大型动车所检查库为研究对象,采用计算流体力学(CFD)数值模拟方法,对检查库通风降温方案进行研究。通过建立数值模型,运用有限元法进行网格划分、边界条件设置及求解计算,系统分析了检查库内部温度场分布特征。研究结果表明... 以成都某新建大型动车所检查库为研究对象,采用计算流体力学(CFD)数值模拟方法,对检查库通风降温方案进行研究。通过建立数值模型,运用有限元法进行网格划分、边界条件设置及求解计算,系统分析了检查库内部温度场分布特征。研究结果表明,采用屋顶通风器与多联岗位空调相结合的通风降温方案,可有效改善工作区域热环境,在确保人员热舒适性的同时兼顾操作便捷性。该研究结果可为类似工程项目的通风系统设计提供理论依据和工程参考。 展开更多
关键词 计算流体力学 数值模拟 热舒适性 通风方案 动车所检查库
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基于CFD方法的某高速船泵舱通风系统设计改进方案
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作者 杨卫国 陈浮 胡云波 《造船技术》 2025年第1期54-59,共6页
为解决某高速船泵舱进水问题,提出泵舱通风系统设计改进方案,即在鹅颈式通风筒进气管道进口加装小型滤清器。基于计算流体动力学(Computational Fluid Dynamics,CFD)方法进行泵舱通风流场仿真计算。计算结果表明,在加装滤清器后阻力损... 为解决某高速船泵舱进水问题,提出泵舱通风系统设计改进方案,即在鹅颈式通风筒进气管道进口加装小型滤清器。基于计算流体动力学(Computational Fluid Dynamics,CFD)方法进行泵舱通风流场仿真计算。计算结果表明,在加装滤清器后阻力损失合理,对泵舱通风流场无明显影响。滤清器试验与实船试验的结果表明,泵舱进水现象得到明显改善,证明所提出方案具有合理性和有效性。 展开更多
关键词 高速船 泵舱 通风系统 设计改进 计算流体动力学 鹅颈式通风筒 滤清器 通风流场
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叶轮机械大规模CFD并行计算方法应用验证
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作者 赵磊 俞一波 +2 位作者 高丽敏 李瑞宇 王可鑫 《推进技术》 EI CAS CSCD 北大核心 2024年第11期13-23,共11页
针对叶轮机械全环模型在大规模数值模拟中的计算需求,结合叶片通道模型的周期性特征,提出了一种创新的分层几何区域分解方法。这种方法通过有效地分解计算任务,实现了在不同计算核心间的负载均衡,优化了并行计算效率。在具备300PFlops(... 针对叶轮机械全环模型在大规模数值模拟中的计算需求,结合叶片通道模型的周期性特征,提出了一种创新的分层几何区域分解方法。这种方法通过有效地分解计算任务,实现了在不同计算核心间的负载均衡,优化了并行计算效率。在具备300PFlops(每秒3×10^(17)次浮点计算)和200PFlops(每秒2×10^(17)次浮点计算)计算能力的高性能计算平台上,本方法能够在1~6 h内完成1.8亿网格规模的多级压气机全环求解。通过对多个典型叶轮机械的算例分析,全面验证了所提出并行方法的性能和计算精度。结果表明,各模型的计算结果与实验数据高度一致,计算误差不超过6%,确保了计算准确。在万核规模的计算任务中,所采用的并行计算方法能够实现线性加速,并行效率在90%以上,证明了其在大规模计算中的高效性。此外,本方法在国产高性能计算平台上同样表现出良好的可移植性和适应性,充分展示了其在不同硬件架构上的广泛适用性及有效性。 展开更多
关键词 叶轮机械 多级压气机 高性能计算 计算流体力学 全环计算
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基于CFD/CSD耦合的翼面抖振响应数值模拟研究
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作者 周迪 张兴彬 +1 位作者 郭同庆 陆志良 《强度与环境》 CSCD 2024年第1期50-58,共9页
发展一种考虑气动弹性效应的CFD/CSD耦合计算方法,对翼面抖振响应进行了数值模拟研究。针对抖振的发生往往伴随着较大尺度分离流动,采用脱体涡模拟方法提高湍流模拟的保真度。针对抖振响应模拟时间历程长、计算量大的特点,基于自主发展... 发展一种考虑气动弹性效应的CFD/CSD耦合计算方法,对翼面抖振响应进行了数值模拟研究。针对抖振的发生往往伴随着较大尺度分离流动,采用脱体涡模拟方法提高湍流模拟的保真度。针对抖振响应模拟时间历程长、计算量大的特点,基于自主发展的动态网格自动化生成方法以及非定常流动和气动弹性高效求解技术,从而提高响应计算效率。分别对大迎角三角翼和超临界机翼进行了抖振响应模拟研究,通过与文献或试验结果的比较以及时频特性分析,验证了所发展方法在大迎角抖振和跨声速抖振响应预测中的可靠性和精确性。 展开更多
关键词 翼面 抖振 气动弹性 计算流体力学
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CFD技术在地板辐射采暖复合机械送风下人体热舒适性的应用
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作者 彭冬根 孙小月 +1 位作者 王浙明 林智 《南昌大学学报(工科版)》 CAS 2024年第3期351-356,共6页
采用计算流体力学数值模拟的方法,探究地板辐射采暖复合机械送风形式的2种送风气流组织变化对人体热舒适的影响。根据模拟得到工作区平面的平均温度、湿度、风速及其分布情况探究2种工况下人体舒适度。并通过对比2种气流组织下头足温差... 采用计算流体力学数值模拟的方法,探究地板辐射采暖复合机械送风形式的2种送风气流组织变化对人体热舒适的影响。根据模拟得到工作区平面的平均温度、湿度、风速及其分布情况探究2种工况下人体舒适度。并通过对比2种气流组织下头足温差、垂直温差以及热舒适性指标预计平均舒适度V_(PM)、预计不满意率P_(PD)对人体热舒适度进行定量评价。结果表明:在送风风速、温度相同的条件下,下送风与上送风工作面平均温度基本相同,风速提升0.02 m·s^(-1),湿度下降0.6%。上送风的空气温度分层更明显,2者的头足温差分别是0.09℃、0.02℃,皆不会令人感到不舒适。上送风和下送风2种气流组织的V_(PM)、P_(PD)值均为-0.18、6%,均符合GB/T 33658—2017《室内人体热舒适环境要求与评价方法》的热舒适要求。综合考虑室内温度分布以及头足温差等指标后,表明在地板辐射采暖复合机械送风中下送风气流组织的效果更好。 展开更多
关键词 热舒适 计算流体力学 送风位置 预计平均舒适度 预计不满意率
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