Numerical Simulations of Turbulent Flows at Widely Different Mach Numbers

Dragos Moroianu

Research output: ThesisDoctoral Thesis (compilation)

Abstract

The present thesis mainly focuses on the numerical simulation of the turbulent flow field and acoustics developed in different industrial applications. The study covers a large range of Mach numbers, starting from incompressible regimes and ending with a fully compressible flow.

In the first part of the thesis, several computations of an incompressible flow, are performed in order to study the behavior of an aircraft engine running close to the ground. The ground vortex interaction and particle ingestion are the investigated topics. The methods involved for solving the flow are the Reynolds Averaged Navier Stokes with a k-epsilon turbulence model closure, Large Eddy Simulation with Smagorinsky sub grid scale model. The particle ingestion problem is investigated using a one way coupling lagrangian particle tracking algorithm.

The second part concerns the study of the flow around moving bodies and the acoustical field generated by it. Based on the flow incompressibility assumption, the problem is decoupled: first the flow solution is computed using Large Eddy Simulation frame work, then the acoustic sources are extracted and finally the acoustical wave propagation is studied using an acoustic analogy developed by Ffowcs-Williams and Hawkings. Three different cases are presented in the papers, all involving rotating bodies: an axial fan, a wind turbine and a propeller. From these

three cases, only the wind turbine computation is presented in more detail in the thesis.

The dynamics of a shock wave in a transonic flow in a channel are investigated in the third part of this thesis using the Large Eddy Simulation framework. Similar phenomena with those encountered in supersonic flows are found: Mach reflection shock wave, regular reflection shock wave, outlet pressure induced hysteresis, unsteady shock wave.
Original languageEnglish
QualificationDoctor
Awarding Institution
  • Fluid Mechanics
Supervisors/Advisors
  • Fuchs, Laszlo, Supervisor
Award date2005 Dec 6
Publisher
ISBN (Print)91-628-6707-5
Publication statusPublished - 2005

Bibliographical note

Defence details

Date: 2005-12-06
Time: 10:15
Place: Room M:E, M-building, Ole Römers väg 1, Lund Institute of Technology

External reviewer(s)

Name: Jens, Soerensen
Title: Professor
Affiliation: Department of Energy Engineering, Technical University of Denmark

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<div class="article_info">Dragos Moroianu. <span class="article_issue_date">2003</span>. <span class="article_title">NUMERICAL COMPUTATION OF THE ACOUSTICAL FIELD AROUND WIND - TURBINES</span> <span class="journal_distributor">Anders Nilsson and Hans Boden</span></div>
<div class="article_info">Dragos Moroianu. <span class="article_issue_date">2004</span>. <span class="article_title">LES OF THE FLOW AND PARTICLE INGESTION INTO AN AIR INTAKE OF A JET ENGINE RUNNING ON THE GROUND</span> <span class="journal_pages">pp GT2004-53762</span>. <span class="journal_distributor">ASME</span></div>
<div class="article_info">Dragos Moroianu. <span class="article_issue_date">2005</span>. <span class="article_title">Large Eddy Simulation of a Shock Boundary Layer Interaction in a Transonic Internal Flow</span> <span class="journal_pages">pp AIAA-2005-0312</span>. <span class="journal_distributor">AIAA</span></div>
<div class="article_info">Dragos Moroianu. <span class="article_issue_date">2005</span>. <span class="article_title">Experimental and Numerical Study of Ground Vortex Interaction in an Air-Intake</span> <span class="journal_pages">pp AIAA-2005-1206</span>. <span class="journal_distributor">AIAA</span></div>
<div class="article_info">Dragos Moroianu. <span class="article_issue_date">2005</span>. <span class="article_title">LES of the Flow and Acoustics Generated by a Wing Installed Aircraft Propeller Running in the Vicinity of the Ground</span> <span class="journal_pages">pp AIAA-2005-2905</span>. <span class="journal_distributor">AIAA</span></div>
<div class="article_info">Dragos Moroianu. <span class="article_issue_date">2005</span>. <span class="article_title">LES of the Flow and Acoustics Generated by an Aircraft Fan Running in the Vicinity of the Ground</span> <span class="journal_pages">pp ASME GT2005-68397</span>. <span class="journal_distributor">ASME</span></div>
<div class="article_info">Dragos Moroianu. <span class="article_issue_date">2005</span>. <span class="article_title">Numerical Simulation of Wind Turbine Noise Generation and Propagation</span> <span class="journal_distributor">Elsevier</span> (inpress)</div>
<div class="article_info">Dragos Moroianu. <span class="article_issue_date">2005</span>. <span class="article_title">Prediction of Wind Turbine Noise Generation and Propagation Based on an Acoustic Analogy</span> <span class="journal_distributor">Elsevier</span> (inpress)</div>

Subject classification (UKÄ)

  • Fluid Mechanics and Acoustics

Keywords

  • vibration and acoustic engineering
  • Maskinteknik
  • hydraulics
  • vacuum technology
  • Mechanical engineering
  • plasma
  • Energy research
  • Energiforskning
  • fluiddynamik
  • plasmas
  • Gaser
  • fluid dynamics
  • Gases
  • computational fluid dynamics
  • Acoustic
  • hydraulik
  • vakuumteknik
  • vibrationer
  • akustik
  • compressible flow

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