scholarly journals Use of Euler free surface flow analysis to provide appropriate injection conditions in Euler-Lagrange numerical models

2013 ◽  
Author(s):  
A. Rossetti ◽  
P. S. Nagabhushan ◽  
B. Barabas ◽  
J. P. Schnitzler ◽  
A. Kefalas ◽  
...  
Keyword(s):  
Free Surface ◽  
Numerical Models ◽  
Flow Analysis ◽  
Free Surface Flow ◽  
Surface Flow

Free Surface Flow Analysis by Smoothed Particle Hydrodynamics

2006 ◽  
Author(s):  
Jun Imasato ◽  
Yuzuru Sakai
Keyword(s):  
Free Surface ◽  
Smoothed Particle Hydrodynamics ◽  
Particle Density ◽  
Flow Analysis ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Pressure Poisson Equation ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Marker And Cell Method

In this study a new computational algorithm to enforce incompressibility in free surface flow analysis using Smoothed Particle Hydrodynamics (SPH) is presented. The method uses two steps. The first step is a fractional step for solving velocity field forward in time without incompressibility. Then the second step is computed to compensate the pressure Poisson equation using the mass constant equation in a particle field. This method is composed of the above two steps and is similar to SMAC (Simplified Marker and Cell) method commonly used in CFD. However in SPH simulation, the introduction of incompressibility of fluid is easily realized using the particle density concept and the boundary of free surface of fluid is also controlled conveniently by the concept. In this study the algorithm is applied to sloshing problems of vessels with fluid. The numerical results using this algorithm show good results in the behaviors of free surface flow and the pressure evaluations at the wall of the vessels.

421 Free Surface Flow Analysis of an Axial Flow Hydraulic Turbine with a Collection Device

2014 ◽  
Vol 2014.24 (0) ◽  
pp. 186-189
Author(s):  
Sou Hirama ◽  
Yasuyuki Nishi ◽  
Terumi Inagaki ◽  
Yanrong Li ◽  
Norio Kikuchi
Keyword(s):  
Free Surface ◽  
Flow Analysis ◽  
Axial Flow ◽  
Free Surface Flow ◽  
Hydraulic Turbine ◽  
Surface Flow ◽  
Collection Device

scholarly journals Parallel Finite Element Method for Large-scale Free Surface Flow Analysis Based on ALE method

1999 ◽  
Vol 2 ◽  
pp. 233-240
Author(s):  
Masaaki SAKURABA ◽  
Seizo TANAKA ◽  
Hiroyuki TAMAKI ◽  
Kazuo KASHIYAMA
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Free Surface ◽  
Large Scale ◽  
Flow Analysis ◽  
Free Surface Flow ◽  
Surface Flow ◽  
Ale Method ◽  
Scale Free ◽  
Parallel Finite Element

scholarly journals COMPARATIVE EFFICIENCIES STUDY OF SLOT MODEL AND MOUSE MODEL IN PRESSURISED PIPE FLOW

2014 ◽  
pp. 83-88
Author(s):  
Saroj Kumar Pandit ◽  
Yoshihiro Oka ◽  
Naohide Shigeta ◽  
Masahiro Watanabe
Keyword(s):  
Free Surface ◽  
Mouse Model ◽  
Numerical Models ◽  
Free Surface Flow ◽  
Numerical Approach ◽  
Surface Flow ◽  
Single Type ◽  
One Dimensional ◽  
Type Flow ◽  
Implicit Finite Difference

The flow in sewers is unsteady and variable between free-surface to full pipe pressurized flow. Sewers are designed on the basis of free surface flow (gravity flow) however they may carry pressurized flow. Preissmann Slot concept is widely used numerical approach in unsteady free surface-pressurized flow as it provides the advantage of using free surface flow as a single type flow. Slot concept uses the Saint-Venant’s equations as a basic equation for one-dimensional unsteady free surface flow. This paper includes two different numerical models using Saint Venant’s equations. The Saint Venant`s equations of continuity and momentum are solved by the Method of Characteristics and presented in forms for direct substitution into FORTRAN programming for numerical analysis in the first model. The MOUSE model carries out computation of unsteady flows which is founded on an implicit, finite difference numerical solution of the basic one dimensional Saint Venant’s equations of free surface flow. The simulation results are compared to analyze the nature and degree of errors for further improvement.

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