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Progress in Computational Fluid Dynamics最新文献

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The Galerkin least squares MLPG method for convection-dominated problems 对流占优问题的Galerkin最小二乘MLPG方法
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2021-01-01 DOI: 10.1504/PCFD.2021.10036931
Xue-Hong Wu
{"title":"The Galerkin least squares MLPG method for convection-dominated problems","authors":"Xue-Hong Wu","doi":"10.1504/PCFD.2021.10036931","DOIUrl":"https://doi.org/10.1504/PCFD.2021.10036931","url":null,"abstract":"","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":"10 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66710895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental and numerical study of upstream slope stability in an earth dam reservoir under rapid drawdown conditions 快速降深条件下土坝水库上游边坡稳定性的试验与数值研究
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2020-12-01 DOI: 10.1504/PCFD.2021.10037990
S. Jahromi, A. Khosrojerdi, H. Darvishi, H. Babazadeh, M. Pakmanesh
{"title":"Experimental and numerical study of upstream slope stability in an earth dam reservoir under rapid drawdown conditions","authors":"S. Jahromi, A. Khosrojerdi, H. Darvishi, H. Babazadeh, M. Pakmanesh","doi":"10.1504/PCFD.2021.10037990","DOIUrl":"https://doi.org/10.1504/PCFD.2021.10037990","url":null,"abstract":"The rapid ‎drawdown of the dam reservoir is one of the most common situations occurring in the lifetime of a dam. For this reason, one of the main factors in the design of the upstream slope is the rapid drainage of the reservoir. In this case, the upstream slope is in a critical condition and the slope may be unstable. When the water surface in the reservoir is drawdown suddenly, the water level in the dam body does not decrease at the same time as the reservoir water level. The analysis of seepage from the earth dam body and calculation of the water loss play an important role in calculating the amount of pore water pressure, and, consequently, the stability analysis of the dam body. In addition, any seepage analysis is dependent on the hydraulic properties of the dam materials. In order to investigate the effect of hydraulic conductivity on the rapid drawdown of water level and the seepage, an experimental model was constructed of an earth dam. By accurate measurement of hydraulic parameters of the materials in saturated and unsaturated media, the flow through this model was modeled using a disk penetrometer by seep/w software. The results were then compared with the observed data.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41871989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Studies on the evolution of shock wave in gas film clearance for aerostatic thrust bearing 气动推力轴承气膜间隙激波演化研究
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2020-07-03 DOI: 10.1504/pcfd.2020.10030339
Shang Gao, Sheng-Long Nong, Wubin Xu
{"title":"Studies on the evolution of shock wave in gas film clearance for aerostatic thrust bearing","authors":"Shang Gao, Sheng-Long Nong, Wubin Xu","doi":"10.1504/pcfd.2020.10030339","DOIUrl":"https://doi.org/10.1504/pcfd.2020.10030339","url":null,"abstract":"This paper researches the evolutions of shock waves in the gas film of aerostatic thrust bearing with a single air supply inlet. The ANSYS Fluent 18.0® is adopted to discuss the flow field characteristics, such as, supersonic flow, negative pressure, load capacity of bearing and backflow area with large values of both gas film thickness and supply pressure. Under thick clearance and large supply pressure conditions, the supersonic flow leads to the appearance of shock wave and causes a negative pressure. If the multi-reflection phenomenon of shock wave occurs, the total load capacity of bearing will even drop to be negative. The above results provide a theoretical basis for people to understand the flow field characteristics of the gas film in the aerostatic thrust bearing under large gas film thickness and large supply pressure conditions, and help the researchers to find out the effective way to restrain the emergence of shock waves and improve the load capacity of aerostatic thrust bearings.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":"1 1","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41346412","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Wave making characteristics of submerged vehicle in a stratified ocean 分层海洋中水下航行器的造波特性
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2020-07-03 DOI: 10.1504/pcfd.2020.10030333
Dawei Li, Guijuan Li, Zhenshan Wang, Lin Sun, Lixun Xie
{"title":"Wave making characteristics of submerged vehicle in a stratified ocean","authors":"Dawei Li, Guijuan Li, Zhenshan Wang, Lin Sun, Lixun Xie","doi":"10.1504/pcfd.2020.10030333","DOIUrl":"https://doi.org/10.1504/pcfd.2020.10030333","url":null,"abstract":"The numerical methods are used to obtain the wave making characteristics of pycnocline interface and free surface in a stratified ocean, the disturbance source is a submerged vehicle (SUBOFF). The unsteady viscous numerical method based on 3-D incompressible RANS equations, re-normalisation group theory k-e turbulence model and volume of fluid method are used to simulate the fluid characteristics of the submerged body moving in a stratified ocean. Two ocean layers with finite depth and different densities are considered. Typical Froude numbers of flow vary between 0.05 and 2. The simulated results show that the wave making characteristics on the surface and interface contain contributions from two different modes: a surface-wave mode and an internal-wave mode. It is observed that there is a large effect of submerged body velocity on the wave systems, structures of free surface and pycnocline interface. The typical wavelength of the interface is predicted to increase with Froude number, which is in agreement with the theory.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46466637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The effect of orbital motion and eccentricity of drill pipe on pressure gradient in eccentric annulus flow with Newtonian and non-Newtonian fluids 轨道运动和钻杆偏心对牛顿和非牛顿流体偏心环空流动压力梯度的影响
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2020-07-03 DOI: 10.1504/pcfd.2020.10030356
Hicham Ferroudji, A. Hadjadj, T. N. Ofei, M. A. Rahman
{"title":"The effect of orbital motion and eccentricity of drill pipe on pressure gradient in eccentric annulus flow with Newtonian and non-Newtonian fluids","authors":"Hicham Ferroudji, A. Hadjadj, T. N. Ofei, M. A. Rahman","doi":"10.1504/pcfd.2020.10030356","DOIUrl":"https://doi.org/10.1504/pcfd.2020.10030356","url":null,"abstract":"The correct prediction of the pressure gradient is the fundamental parameter to establish an effective hydraulics program, which enables an optimised drilling process. In the present work, the effect of the orbital motion of the drill pipe on the pressure drop in an eccentric annulus flow with Newtonian and non-Newtonian fluids is studied numerically for both laminar and turbulent regimes using finite volume method (FVM). Furthermore, the effect of eccentricity when the inner pipe makes an orbital motion is evaluated. Different behaviours are observed in laminar and turbulent regimes. In the laminar regime, the simulation results showed that an increase of the orbital motion speed causes a considerable increment of the pressure gradient for the Newtonian fluid. For the power-law, non-Newtonian fluid in the laminar regime, on the contrary, a decrease of the pressure gradient is observed due to the shear-thinning effect. In the turbulent regime the mentioned trends are predicted to be much weaker. As eccentricity increases, the pressure drop of the non-Newtonian fluid decreases with a more pronounced diminish in pressure drop when the drill pipe is in orbital motion for both laminar and turbulent flow regimes.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45855485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Reflection behaviour of the porous tube boundary condition for FSI simulations of the truncated vascular network 截断维管网络FSI模拟中多孔管边界条件的反射行为
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2020-07-03 DOI: 10.1504/pcfd.2020.10030337
Seyed Hamidreza Attaran, H. Niroomand-oscuii
{"title":"Reflection behaviour of the porous tube boundary condition for FSI simulations of the truncated vascular network","authors":"Seyed Hamidreza Attaran, H. Niroomand-oscuii","doi":"10.1504/pcfd.2020.10030337","DOIUrl":"https://doi.org/10.1504/pcfd.2020.10030337","url":null,"abstract":"Among the several aspects of numerical simulations, the boundary condition is one of the most important issues to deal with in simulations of the cardiovascular network. Previously we introduced a new method for modelling the downstream of the truncated artery by means of porous media theory. In the present work, we aim to investigate the reflection characteristics of this new model and find the relation between the permeability and the reflection ratio. Numerical simulations have been performed and seven different cases have been tested. The results show a strong dependence of reflection on the permeability magnitude and it was found that the porous interface behaves like an intermediate situation between closed-end and open-end tubes.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46169132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Second-order slip condition considering Langmuir isothermal adsorption for rarefied gas microflows 考虑Langmuir等温吸附的稀薄气体微流的二阶滑移条件
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2020-07-03 DOI: 10.1504/pcfd.2020.10030334
N. Le, T. Tran, M. H. Dang
{"title":"Second-order slip condition considering Langmuir isothermal adsorption for rarefied gas microflows","authors":"N. Le, T. Tran, M. H. Dang","doi":"10.1504/pcfd.2020.10030334","DOIUrl":"https://doi.org/10.1504/pcfd.2020.10030334","url":null,"abstract":"Effect of the slip boundary condition on rarefied gas flow simulations plays an important role to understand the behaviour of gas microflows in MEMS. Several second-order slip conditions were proposed by the models of the kinetic theory of gases to simulate the rarefied gas microflows, in which the so-called classical second-order slip condition was derived from the Karniadakis et al. model. In this paper, a new second-order slip condition is proposed to employ with the Navier-Stokes-Fourier equations for simulating the rarefied gas flows in microchannels. It is derived by combining the Langmuir isothermal adsorption and the Karniadakis et al. model, with the aim of achieving a more realistic physical model. The pressure-driven back-forward-step, the Couette and pressure-driven Poiseulle rarefied gas flows in microchannels are investigated to validate our new second-order slip condition. Slip velocities using our new second-order slip condition are better than those using the conventional Maxwell and the so-called classical second-order slip conditions, and are in very good agreement with the DSMC data for all cases considered.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42114340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
CFD modelling of hydrate slurry flow in a pipeline based on Euler-Euler approach 基于Euler-Euler方法的管道水合物浆体流动CFD建模
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2020-05-05 DOI: 10.1504/pcfd.2020.10029268
A. Berrouk, Pengpeng Jiang, Ferozkhan Safiyullah, M. Basha
{"title":"CFD modelling of hydrate slurry flow in a pipeline based on Euler-Euler approach","authors":"A. Berrouk, Pengpeng Jiang, Ferozkhan Safiyullah, M. Basha","doi":"10.1504/pcfd.2020.10029268","DOIUrl":"https://doi.org/10.1504/pcfd.2020.10029268","url":null,"abstract":"The presence and agglomeration of hydrates particle in oil and gas transportation pipeline can pose a major threat for the flow assurance. Understanding the hydrate-containing flow characteristics is of essence to efficiently manage and transport hydrate slurries. In this work, a 3D computational fluid dynamics model of hydrates slurry flow in pipeline was built using Eulerian-Eulerian multiphase approach. Reynolds averaged numerical simulation based on the Reynolds stress model was used to capture the turbulence. User defined functions of hydrates particle size and shear viscosity models were developed and integrated into the CFD model. The model predictions on pressure gradients at different inlet velocities and hydrates volume fractions were compared with the experimental data. Hydrates deposition characteristics were investigated and the hydrates deposition bed heights were determined for low inlet velocities. This study should provide valuable insight into hydrate-laden flow in pipelines that might help redesign them for better flow assurance.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43159064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
An immersed boundary method for simulations of flow and mixing in micro-channels with electro kinetic effects 考虑电动力效应的微通道流动与混合模拟的浸入边界法
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2020-03-26 DOI: 10.1504/pcfd.2020.10027924
C. Saleel, I. Badruddin
{"title":"An immersed boundary method for simulations of flow and mixing in micro-channels with electro kinetic effects","authors":"C. Saleel, I. Badruddin","doi":"10.1504/pcfd.2020.10027924","DOIUrl":"https://doi.org/10.1504/pcfd.2020.10027924","url":null,"abstract":"Immersed boundary method (IBM) is a methodology in which any real stationary or moving complex bodies in flow or heat transfer or mixing field is treated by distinct forcing functions introduced in the respective governing equations, thereby its presence is dealt with much easiness in the computational domain. This work proposes an extension of an IBM based on discrete forcing approach to simulate pressure driven electro-osmotic flow and mixing enhancement in constricted micro channels. The fractional-step based temporal discretisation and finite-volume basedspatial discretisation on a staggered mesh are used to solve the governing equations. Concentration forcing function is a parameter, which is newly defined in this model to satisfy the no-flux boundary condition for species concentration on the IB and is introduced in convection-diffusion equation. The present computational model is validated with the published experimental and numerical results in the literature and finally some sample results are also exemplified.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47916985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Suppressing artificial equilibrium states caused by spurious currents in droplet spreading simulations with dynamic contact angle model 用动态接触角模型抑制液滴扩散模拟中由杂散电流引起的人为平衡状态
IF 0.7 4区 工程技术
Progress in Computational Fluid Dynamics Pub Date : 2020-03-26 DOI: 10.1504/pcfd.2020.10027926
T. Antritter, Martin Mayer, P. Hachmann, M. Wörner
{"title":"Suppressing artificial equilibrium states caused by spurious currents in droplet spreading simulations with dynamic contact angle model","authors":"T. Antritter, Martin Mayer, P. Hachmann, M. Wörner","doi":"10.1504/pcfd.2020.10027926","DOIUrl":"https://doi.org/10.1504/pcfd.2020.10027926","url":null,"abstract":"Accurate methods for numerical simulation of dynamic wetting and spreading phenomena are a valuable tool to support the advancement of related technological processes such as inkjet-printing. Here, it is demonstrated that numerical methods employing dynamic contact angle models are prone to artificial equilibrium states caused by spurious (parasitic) currents. The capability of different approaches in reducing spurious currents for sessile and spreading droplets with low equilibrium contact angle is evaluated. To minimise the influence of spurious currents on dynamic contact angle models, a smoothing step in the evaluation of the contact line velocity is introduced in this paper. The benefit and performance of this new approach is demonstrated by algebraic volume-of-fluid simulations of spreading and receding droplets with the Kistler dynamic contact angle model.","PeriodicalId":54552,"journal":{"name":"Progress in Computational Fluid Dynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2020-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44296238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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