WSEAS Transactions on Fluid Mechanics最新文献_第8页

Testing Engine Oil Specifications and Properties and its Effects on the Engines Maintenance and Performance 试验机油的规格和性能及其对发动机维护和性能的影响

WSEAS Transactions on Fluid Mechanics Pub Date : 2020-06-05 DOI: 10.37394/232013.2020.15.14

Mohannad O. Rawashdeh, Sayel M. Fayyad, Ahmad Awwad

引用次数: 1

Simulations of Frictional Losses in a Turbulent Blood Flow Using Three Rheological Models 用三种流变模型模拟湍流血流中的摩擦损失

WSEAS Transactions on Fluid Mechanics Pub Date : 2020-05-06 DOI: 10.37394/232013.2020.15.13

A. Bartosik

{"title":"Simulations of Frictional Losses in a Turbulent Blood Flow Using Three Rheological Models","authors":"A. Bartosik","doi":"10.37394/232013.2020.15.13","DOIUrl":"https://doi.org/10.37394/232013.2020.15.13","url":null,"abstract":"Blood flow rate is a crucial factor in transporting an oxygen and depends on several parameters like heart pressure, blood properties like density and viscosity, frictional loss and diameter and shape of vein. Frictional loss is a main challenge of current engineering. Therefore, simulation of dependence of blood properties on frictional loss is very important. When blood properties are considered the first step is to find proper rheological model. It is well known that human blood demonstrates a yield shear stress. Therefore, the research is focused on simulating frictional losses in a turbulent flow of human blood, which demonstrates a yield stress. Three arbitrarily chosen rheological models were considered, namely Bingham, Casson and Herschel-Bulkley. Governing equations describing turbulent blood flow were developed to axially symmetrical an aorta. The mathematical model constitutes three partial differential equations, namely momentum equation, kinetic energy of turbulence and its dissipation rate. The main objective of the research is examining influence of the yield shear stress on frictional losses in a human blood in an aorta when flow becomes turbulent. Simulation of blood flow confirmed marginal influence of a yield shear stress on frictional losses when flow becomes turbulent. Results of simulations are discussed and final conclusions are stated.","PeriodicalId":39418,"journal":{"name":"WSEAS Transactions on Fluid Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44377687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Overall Performance of a Centrifugal Vaned Diffuser Pump for Different Flow Rates, Experimental and Numerical Comparisons 离心叶片扩散泵在不同流量下的整体性能、实验和数值比较

WSEAS Transactions on Fluid Mechanics Pub Date : 2020-04-27 DOI: 10.37394/232013.2020.15.12

Taha El Amine Terki Hassaine, A. Seddini, H. Bouchelkia

{"title":"Overall Performance of a Centrifugal Vaned Diffuser Pump for Different Flow Rates, Experimental and Numerical Comparisons","authors":"Taha El Amine Terki Hassaine, A. Seddini, H. Bouchelkia","doi":"10.37394/232013.2020.15.12","DOIUrl":"https://doi.org/10.37394/232013.2020.15.12","url":null,"abstract":"The article presents the analysis of the interactions between the impeller and the vaned diffuser of a radial flow pump. The tests were carried out on the so-called SHF impeller, coupled with a vaned diffuser, and working with air. The particularity of this machine is that the diffuser design flow rate corresponds to 80% of the impeller one. All experimental works were performed at the Fluid Mechanics Laboratory in ENSAM, Lille, France. Investigations have been made for five different flow rates. Global performances of the machine are evaluated thanks to pressure measurements and averaged velocities obtain with a three hole probe, at nine angular positions at diffuser inlet and outlet just as five radial positions in a middle section of a blade-to-blade passage. A post-processing procedure, based on statistical tools, was applied to the experimental results in order to reach a better understanding of the phenomena. In another approach, a numerical simulation of the flow inside the pump, for eight different relative angular positions of the diffuser relative to the impeller (Frozen rotor) was performed by the STAR-CCM+ software. The experimental results were compared to numerical data obtained with the help of STAR-CCM+ computer code.","PeriodicalId":39418,"journal":{"name":"WSEAS Transactions on Fluid Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45557476","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A Theoretical Study of an Extended KDV Equation 一类扩展KDV方程的理论研究

WSEAS Transactions on Fluid Mechanics Pub Date : 2020-04-08 DOI: 10.37394/232013.2020.15.10

M. Berjawi, Toufic El-Arwadi, Samer Israwi

引用次数: 3

Numerical Prediction of the Flow Structure Inside Components of Industrial Glass Furnace Systems 工业玻璃窑炉系统部件内部流动结构的数值预测

WSEAS Transactions on Fluid Mechanics Pub Date : 2020-04-08 DOI: 10.37394/232013.2020.15.11

C. Cravero, D. De Domenico, F. Kenfack, Philippe J. Leutcha

{"title":"Numerical Prediction of the Flow Structure Inside Components of Industrial Glass Furnace Systems","authors":"C. Cravero, D. De Domenico, F. Kenfack, Philippe J. Leutcha","doi":"10.37394/232013.2020.15.11","DOIUrl":"https://doi.org/10.37394/232013.2020.15.11","url":null,"abstract":"An important aspect in the glass production industry is related to the heat recovery of the combustion gases. It is usually obtained throughout the use of well-tested technologies, such as regenerative towers with refractory material. For an effective heat recovery, a good distribution of the flow rate at the entrance of the chambers is crucial. The use of Computational Fluid Dynamics (CFD) allows the detailed analysis of the gas evolution during the process; the same would be impractical with experimental measurements, due to prohibitive ambient local conditions. The CFD approach during the design phase typically considers CAD geometries without the level of details related to technological features of the actual installed configuration (i.e. sharp edges vs rounded edges). A brand new built furnace has blunt edges in every connection between 3D walls of refractory blocks. The above edges will be rounded by the erosion-corrosion process due to the harsh chemical/mechanical/thermal environmental conditions inside the plant components (i.e. regenerative chambers, connecting ducts, furnace). The purpose of this work is to evaluate the influence of the geometrical details of the CAD (with focus on the edges connecting adjacent walls), due to technological or erosion aspects, on the flow structure in the furnace components.","PeriodicalId":39418,"journal":{"name":"WSEAS Transactions on Fluid Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43247797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Noll’s Axioms and Formulation of the Closure Relations for the Subgrid Turbulent Tensor in Large Eddy Simulation 大涡模拟中亚网格湍流张量的Noll公理和闭包关系的表述

WSEAS Transactions on Fluid Mechanics Pub Date : 2020-03-17 DOI: 10.37394/232013.2020.15.8

F. Gallerano, G. Cannata

引用次数: 3

Numerical Contribution to Airflow Study Through a Generic Merchant Ship Models 通过通用商船模型对气流研究的数值贡献

WSEAS Transactions on Fluid Mechanics Pub Date : 2020-03-17 DOI: 10.37394/232013.2020.15.7

Berrezoug Djawad Soufiane, Mohammed Bouzit, L. Merahi, Mohammed A. Bencherif

{"title":"Numerical Contribution to Airflow Study Through a Generic Merchant Ship Models","authors":"Berrezoug Djawad Soufiane, Mohammed Bouzit, L. Merahi, Mohammed A. Bencherif","doi":"10.37394/232013.2020.15.7","DOIUrl":"https://doi.org/10.37394/232013.2020.15.7","url":null,"abstract":"The merchant ships are continuously recruited by the world meteorological organization (WMO) as Voluntary Observing Ship (VOS) for the collect of meteorological parameters at the ocean surface. VOS meteorological observation includes many parameters such as the wind speed measured by anemometers. This measurement is biased by the presence of ship and superstructure. Little work was carried out in this field. Between them we find the experimental work at a low speed wind tunnel of Southampton University which studies the airflow distortion over simple models (generic models) of VOS merchant ship. This study presents numerical results of a 3D simulation analyzing airflow effect above the bridge of a generic merchant ship models involved in VOS. For this purpose three-dimensional, stationary and turbulent, numerical simulation has been achieved the flow over the bridge of a tanker and a container ship at 1/ 46 scale using a numerical code and CFX code with turbulence k-ε models. This numerical study allows us to know the position of the line of equality as well as the zone of acceleration and deceleration of the flow. The results obtained numerically by numerical code and CFX code are compared with those obtained experimentally in the wind tunnel of Southampton University. Numerical results are in a good agreement with experimental results and can be used as a reference to find the position of the equality line and to know the error range in of the anemometer velocity reading.","PeriodicalId":39418,"journal":{"name":"WSEAS Transactions on Fluid Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49242311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wave Fields and Nearshore Currents in the Coastal Region Opposite San Mauro Cilento (Italy) San Mauro Cilento（意大利）对面海岸地区的波浪场和近岸洋流

WSEAS Transactions on Fluid Mechanics Pub Date : 2020-03-17 DOI: 10.37394/232013.2020.15.9

F. Palleschi, Benedetta Iele, M. Tamburrino

引用次数: 1

Numerical Simulation of the Sea Bottom Modifications Behind a T-head Groin t形腹股沟后海底变化的数值模拟

WSEAS Transactions on Fluid Mechanics Pub Date : 2020-02-28 DOI: 10.37394/232013.2020.15.6

M. Tamburrino, F. Gallerano

{"title":"Numerical Simulation of the Sea Bottom Modifications Behind a T-head Groin","authors":"M. Tamburrino, F. Gallerano","doi":"10.37394/232013.2020.15.6","DOIUrl":"https://doi.org/10.37394/232013.2020.15.6","url":null,"abstract":"In this paper, we simulate the sea bottom modifications produced by the presence of a T-head groin. We present a simulation model of sea bottom modifications composed of two sub-models: a two-dimensional phase-resolving model that simulate the variation of the fluid dynamic variables inside the wave; a second sub-model to simulate the sea bottom modifications, in which the suspended sediment concentration is calculated by the wave-averaged advection-diffusion equation. The fluid motion equation and the concentration equation are expressed in a new contravariant formulation. The velocity fields from deep water up to just seaward of the surf-zone are simulated by a new integral contravariant form of the Fully Nonlinear Boussinesq Equations. The new integral form of the proposed continuity equation does not contain the dispersive term. The Nonlinear Shallow Water Equations, expressed in an integral contravariant form, are solved in order to simulate the breaking wave propagation. The momentum equation, integrated over the turbulent boundary layer, is solved to calculate the near-bed instantaneous flow velocity and the intra-wave hydrodynamic quantities. Starting from the contravariant formulation of the advection–diffusion equation for the suspended sediment concentration, it is possible to calculate the sea bottom modification. The advective sediment transport terms in the advection-diffusion equation are formulated according to a quasi-three-dimensional approach","PeriodicalId":39418,"journal":{"name":"WSEAS Transactions on Fluid Mechanics","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46482773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Boundary Conditions for the Simulation of Wave Breaking 波浪破碎模拟的边界条件

WSEAS Transactions on Fluid Mechanics Pub Date : 2020-02-21 DOI: 10.37394/232013.2020.15.4

Benedetta Iele, F. Palleschi, F. Gallerano

引用次数: 4