Pub Date : 2015-07-09DOI: 10.1504/pcfd.2015.070447
S. Huang
By using 3Ddynamic mesh technique,the numerical simulation of the unsteady flow field in a roto-jet pump was performed in this work.The surface motion of the impeller computational domain was defined by the profile file in fluent commercial code,in which the rotational direction and speed of the impeller were specified.In the simulation by means of dynamic mesh technique,all the computational domains,as stationary,were set in an inertial reference frame.Three methods(spring-based smoothing,dynamic layering and local remeshing)were used to achieve mesh deformation.The time-dependent relations of velocity field,pressure,the outlet flow rate and the radial force were obtained by this unsteady simulation.After a startup stage the flow starts to exhibit time-periodic behavior corresponding to blade passing frequency of impeller.Radial force direction from the axis points to the back of the pick?up pipe.This work shows that dynamic mesh technique can achieve numerical simulation of three-dimensional unsteady flow field in roto-jet pump and have a strong versatility and broad application prospects.
{"title":"A Numerical Simulation of 3DUnsteady Flow in Roto?jet Pumps by Dynamic Mesh Technique","authors":"S. Huang","doi":"10.1504/pcfd.2015.070447","DOIUrl":"https://doi.org/10.1504/pcfd.2015.070447","url":null,"abstract":"By using 3Ddynamic mesh technique,the numerical simulation of the unsteady flow field in a roto-jet pump was performed in this work.The surface motion of the impeller computational domain was defined by the profile file in fluent commercial code,in which the rotational direction and speed of the impeller were specified.In the simulation by means of dynamic mesh technique,all the computational domains,as stationary,were set in an inertial reference frame.Three methods(spring-based smoothing,dynamic layering and local remeshing)were used to achieve mesh deformation.The time-dependent relations of velocity field,pressure,the outlet flow rate and the radial force were obtained by this unsteady simulation.After a startup stage the flow starts to exhibit time-periodic behavior corresponding to blade passing frequency of impeller.Radial force direction from the axis points to the back of the pick?up pipe.This work shows that dynamic mesh technique can achieve numerical simulation of three-dimensional unsteady flow field in roto-jet pump and have a strong versatility and broad application prospects.","PeriodicalId":113376,"journal":{"name":"China Rural Water and Hydropower","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130200087","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}
According to the optimal operating problem of the river basin flood control,and to analysis of the inner relation among the inflow,discharged ability of the cascade reservoir and the flood peak discharge of the flood control point in the river,this paper puts forward the solving method combining the flood operating model with progressive optimality algorithm.The instance results show that this method successfully provides a set of simple,efficient and actual models and solutions for real-time flood dispatching and flood control system planning.
{"title":"Application of Progressive Optimality Algorithm to Cascade Reservoir Optimal Operation in Flood Control","authors":"Qi Jing-li","doi":"10.1201/b14013-13","DOIUrl":"https://doi.org/10.1201/b14013-13","url":null,"abstract":"According to the optimal operating problem of the river basin flood control,and to analysis of the inner relation among the inflow,discharged ability of the cascade reservoir and the flood peak discharge of the flood control point in the river,this paper puts forward the solving method combining the flood operating model with progressive optimality algorithm.The instance results show that this method successfully provides a set of simple,efficient and actual models and solutions for real-time flood dispatching and flood control system planning.","PeriodicalId":113376,"journal":{"name":"China Rural Water and Hydropower","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123818516","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}
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