Numerical investigation of free surface and pipe flow problems by smoothed particle hydrodynamics

Date

2017

Author

Dinçer, Ali Ersin

Metadata

Show full item record

Item Usage Stats

164
views

0
downloads

In the present study, a two-dimensional (2D) computer code for free surface and pipe flows is developed by using Smoothed Particle Hydrodynamics (SPH) approach. For free surface flow problem, idealized dam break problems are investigated numerically. The results of three recently published experimental studies are used to validate the numerical solutions. In addition to mesh-free particle method, SPH with a novel boundary treatment model proposed in the present study, mesh-based methods with turbulence and laminar modelling are used to simulate the dam break problem. It is confirmed that SPH can be used to predict the behavior of dam-break induced flows. In addition, the computational time of SPH decreases with the proposed boundary model which is seminal for fluid-structure interaction problems with SPH. Liquid slug flow driven by pressurized air in inclined and horizontal pipes with a downstream elbow is investigated numerically for the application of SPH in pipe flows. As the liquid slug hits the elbow, the impact pressure and the associated force generated at the elbow may damage pipe supports as well as the pipe itself. The slug arrival velocity and slug length (i.e. mass) at the elbow directly affect that pressure. In order to calculate these slug parameters just before the impact an improved one-dimensional (1D) model proposed in the literature is used. At the elbow, pressure variation with respect to time is calculated with SPH. The obtained numerical data are validated with previously published experimental results. For both short and long slugs, calculated peak pressures and pressure variations show great agreement with those of measured peak pressures and pressure variations.

Subject Keywords

Hydrodynamics., Fluid dynamics., Numerical analysis., Open-channel flow.

URI

http://etd.lib.metu.edu.tr/upload/12621265/index.pdf
https://hdl.handle.net/11511/26533

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Numerical modeling of general compressible multi-phase flows Kalpaklı, Bora; Tarman, Işık Hakan; Özyörük, Yusuf; Department of Engineering Sciences (2013) In this thesis, some novel methods for solution of compressible, multi-phase flows on unstructured grids were developed. The developed methods are especially advantageous for interface problems, while they are also applicable to multi-phase flows containing mixtures as well as particle suspensions. The first method studied was a multi-dimensional, multi-phase Godunov method for compressible multi-phase flows. This method is based on the solution of a hyperbolic equation system for compressible multi-phase f...
Numerical Modeling of Electromagnetic Scattering from Periodic Structures by Transformation Electromagnetics ÖZGÜN, ÖZLEM; Kuzuoğlu, Mustafa (2016-09-22) The transformation electromagnetics is applied to the modeling of electromagnetic scattering from periodic structures in conjunction with the finite element method with periodic boundary conditions. In a unit cell of periodic structure, a uniform mesh is used over a flat surface and the arbitrary periodic surface is modeled by a coordinate transformation. The major advantage of this approach is that arbitrary geometries can be handled by using a single and simple mesh. Therefore, repeated computations (such...
Numerical and experimental analysis for comparison of square, cylindrical and plate fin arrays in external flow İnci, Aykut Barış; Bayer, Özgür; Department of Mechanical Engineering (2018) Geometrical optimization of square, cylindrical and plate fins for heat transfer augmentation is numerically performed in the external flow. Heat transfer performance of fins with different profiles are compared with same Reynolds number. The relation between the thermal characteristic of fins and boundary conditions like free-stream velocity and heat input are investigated. Experimental studies are performed using manufacturable fins to validate numerical model. Heat transfer correlations are derived in or...
Marker-Based, 3-D Adaptive Cartesian Grid Method for Multiphase Flow around Irregular Geometries (Cart3DAdapt) Uzgören, Eray(2016-2-07) Computational simulations of multiphase flow are challenging because many practical applications require adequate resolution of not only interfacial physics associated with moving boundaries with possible topological changes, but also around three-dimensional, irregular solid geometries. This project focuses on the simulations of fluid/fluid dynamics around complex geometries, based on an Eulerian-Lagrangian framework. The approach envisions using two independent but related grid layouts to track the interf...
Incompressible flow simulations using least squares spectral element method on adaptively refined triangular grids Akdağ, Osman; Sert, Cüneyt; Department of Mechanical Engineering (2012) The main purpose of this study is to develop a flow solver that employs triangular grids to solve two-dimensional, viscous, laminar, steady, incompressible flows. The flow solver is based on Least Squares Spectral Element Method (LSSEM). It has p-type adaptive mesh refinement/coarsening capability and supports p-type nonconforming element interfaces. To validate the developed flow solver several benchmark problems are studied and successful results are obtained. The performances of two different triangular ...

Citation Formats

A. E. Dinçer, “Numerical investigation of free surface and pipe flow problems by smoothed particle hydrodynamics,” Ph.D. - Doctoral Program, Middle East Technical University, 2017.