scholarly journals Three-dimensional characterisation of sedimentary heterogeneity and its impact on subsurface flow behaviour through the braided-to-meandering fluvial deposits of the Castissent Formation (late Ypresian, Tremp-Graus Basin, Spain)

2019 ◽  
Vol 103 ◽  
pp. 661-680 ◽  
Author(s):  
Josep M. Puig ◽  
Patricia Cabello ◽  
John Howell ◽  
Pau Arbués
Keyword(s):  
Subsurface Flow ◽  
Three Dimensional ◽  
Flow Behaviour ◽  
Fluvial Deposits ◽  
Late Ypresian

scholarly journals Investigation of the Unsteady Flow Behaviour on a Wind Turbine Using a BEM and a RANSE Method

2016 ◽  
Vol 2016 ◽  
pp. 1-12
Author(s):  
Israa Alesbe ◽  
Moustafa Abdel-Maksoud ◽  
Sattar Aljabair
Keyword(s):  
Unsteady Flow ◽  
Wind Turbine ◽  
Pressure Distribution ◽  
Three Dimensional ◽  
Panel Method ◽  
Flow Behaviour ◽  
Viscous Effects ◽  
Horizontal Axis Wind Turbine ◽  
Local Flow ◽  
Ranse Solver

Analyses of the unsteady flow behaviour of a 5 MW horizontal-axis wind turbine (HAWT) rotor (Case I) and a rotor with tower (Case II) are carried out using a panel method and a RANSE method. The panel method calculations are obtained by applying the in-house boundary element method (BEM) panMARE code, which is based on the potential flow theory. The BEM is a three-dimensional first-order panel method which can be used for investigating various steady and unsteady flow problems. Viscous flow simulations are carried out by using the RANSE solver ANSYS CFX 14.5. The results of Case I allow for the calculation of the global integral values of the torque and the thrust and include detailed information on the local flow field, such as the pressure distribution on the blade sections and the streamlines. The calculated pressure distribution by the BEM is compared with the corresponding values obtained by the RANSE solver. The tower geometry is considered in the simulation in Case II, so the unsteady forces due to the interaction between the tower and the rotor blades can be calculated. The application of viscous and inviscid flow methods to predict the forces on the HAWT allows for the evaluation of the viscous effects on the calculated HAWT flows.

PIV measurements in a microfluidic 3D-sheathing structure with three-dimensional flow behaviour

2002 ◽  
Vol 12 (6) ◽  
pp. 862-869 ◽  
Author(s):  
H Klank ◽  
G Goranovi  ◽  
J P Kutter ◽  
H Gjelstrup ◽  
J Michelsen ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Flow Behaviour ◽  
Three Dimensional Flow ◽  
Piv Measurements ◽  
Dimensional Flow

Flow Behaviour Analysis of Injection Mixer for CNG Engines using Computational Fluid Dynamics

2018 ◽  
Vol 9 (5) ◽  
Author(s):  
R. Paullinga Prakash ◽  
S. Palani ◽  
D. Vijaya Kumar ◽  
S. Arun Kumar ◽  
S. Shanmugan
Keyword(s):  
Fluid Dynamics ◽  
Cfd Simulation ◽  
Three Dimensional ◽  
Fuel Mixture ◽  
Flow Behaviour ◽  
Liquid Fuels ◽  
Cfd Analysis ◽  
Design Modification ◽  
Gaseous Fuels ◽  
Fuel Tube

Use of gaseous fuels for fuelling the engines reduces reactive hydrocarbons and do not pose the problem of vaporization as with the liquid fuels. One of the problems of gaseous mixers is the ability to prepare a homogeneous mixing of air and fuel at a specific air-fuel ratio prior to entering the engine resulting high exhaust emissions. The objective of this project is to carry out three dimensional CFD analysis of CNG injection mixer to understand the flow behaviour of air fuel mixture and to optimize the design of injection mixer. The analysis was carried out by varying the injection position and injection inclination. The results of the CFD simulation could be used to understand the effect of position of fuel tube, injection inclination in the mixing of air and fuel. Further the results of the study would also be considered for the design modification.

scholarly journals Developing a three-dimensional coupled model of pipe-matrix subsurface flow

2008 ◽  
Vol 2 ◽  
pp. 52-55 ◽  
Author(s):  
Hyunuk An ◽  
Yutaka Ichikawa ◽  
Yasuto Tachikawa ◽  
Michiharu Shiiba
Keyword(s):  
Subsurface Flow ◽  
Three Dimensional ◽  
Coupled Model

Theoretical Study of the Three-Dimensional Flow Field in the Calender Bank

2003 ◽  
Author(s):  
S. Luther ◽  
D. Mewes ◽  
R. H. Schuster
Keyword(s):  
Free Surface ◽  
Flow Field ◽  
Product Quality ◽  
Three Dimensional ◽  
Flow Behaviour ◽  
Stream Line ◽  
Speed Ratio ◽  
Three Dimensional Flow ◽  
Specific Product ◽  
Dimensional Flow

The three-dimensional flow field in the calender gap is calculated with consideration of the free surface of the bank. Calender units with rotating rolls are used to produce foils or sheets from polymer material with viscous or elastometric flow properties. The flow field and the adjusting form of the bank determine the properties of the product. The results of the calculations include the determiniation of vortex patterns inside the bank for fluids with viscous non-Newtonian and Newtonian flow behaviour as well as the determination of the influence of gap height and speed ratio on the coordinates of the free surface and the flow field. Additionally the influence of the flow field on the product quality is presented. Due to the requirement of a good product quality the influencing parameters are subject to boundaries. Such boundaries of the parameters are discussed and a schematic processing window for a specific product geometry is given. Analysed product properties are thickness, surface appearance, air inclusions, mixing and temperature. The numerical calculation is based on a decoupled calculation method for the free surface. The transport equation for mass and impulse are solved with the fluid dynamics analysis package Polyflow. The coordinates of the free surface are shifted until the free surface becomes a stream line. To analyse the flow behaviour polymeric fluids the power-law model of Ostwald-de-Waele is used.

Experimental and numerical studies on the starting effect on the secondary flow in a bend

2007 ◽  
Vol 574 ◽  
pp. 109-129 ◽  
Author(s):  
OLIVIER BOIRON ◽  
VALÉRIE DEPLANO ◽  
ROBERT PELISSIER
Keyword(s):  
Initial Conditions ◽  
Three Dimensional ◽  
Subsequent Development ◽  
Flow Behaviour ◽  
Injection Velocity ◽  
Dean Number ◽  
Experimental Modelling ◽  
Volume Method ◽  
Parameter Values ◽  
Hot Film

A numerical and experimental modelling study was carried out in a curved tube to analyse the behaviour of unsteady flows in a bend. Based on a test bench, with no mechanical disturbances, the flow behaviour was observed using fluorescein injection. Velocity measurements were performed using hot-film anemometry. In addition, a finite volume method was used to perform three-dimensional unsteady numerical simulations. Womersley parameter values between 8 and 21 and Dean number values between 110 and 420 were used to assess the parameters affecting the flow behaviour. Secondary motions were observed, experimentally and numerically, showing the complexity of the flow patterns. The initiation and subsequent development are explained quantitatively. Based on our analysis of the starting effect, the secondary patterns were found to be highly dependent on both the initial conditions and the flow waveforms.

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