Detached eddy simulation using a high order low dissipation low dispersion computational method for aeroacoustic purposes

Date

2015-09-10

Author

Cengiz, Kenan
Özyörük, Yusuf

Metadata

Show full item record

Item Usage Stats

111
views

0
downloads

A compressible flow solver designed for determining aeroacoustic source mechanisms is being developed. Capturing the 3-D unsteady turbulent structures is particularly crucial to address quadrapole sources around a solid body. For this purpose, a detached-eddy simulation (DES) method is proposed which is intended to obtain turbulence with acceptable computational costs. Despite the fact that DES is originally designed for separated flows at high Reynolds numbers, recent improvements has made it capable of a wider range of problems, even low-Re attached flows. In this study, the flow solver has low dissipation and low dispersion characteristics together with fourth-order accuracy allowing it to sustain turbulent fluctuations and acoustic waves. The benefits of all these features are intended to be validated through a channel flow case, which is known as a challenge for a DES method. The turbulence not only developed in the channel, but also it was able to give satisfactory results when compared with available DNS data as a reference solution.

URI

aiac.ae.metu.edu.tr/2015
https://hdl.handle.net/11511/73697

Conference Name

AIAC'2015 Ankara International Aerospace Conference

Collections

Department of Aerospace Engineering, Conference / Seminar

Suggestions

OpenMETU
Core

Detached Eddy simulation of turbulent flow on 2D hybrid grids Yırtıcı, Özcan; Uzol, Oğuz; Tuncer, İsmail Hakkı; Department of Aerospace Engineering (2012) In this thesis study, Detached Eddy Simulation turbulence model is studied in two dimension mainly for flow over single element airfoils in high Reynolds numbers to gain experience with model before applying it to a three dimensional simulations. For this aim, Spalart-Allmaras and standard DES ,DES97, turbulence models are implemented to parallel, viscous, hybrid grid flow solver. The flow solver ,Set2d, is written in FORTRAN language. The Navier-Stokes equations are discretized by first order accurately ce...
Lateral mode resonators for in liquid biosensing applications with a second harmonic based read out method Aydın, Eren; Külah, Haluk; Department of Electrical and Electronics Engineering (2017) This thesis presents design and implementation of lateral mode electrostatic resonators for in liquid biosensing applications and a novel read-out approach for eliminating parasitic feedthrough current and enhance Q of the resonating system at the same time. The main objective of this thesis is to make resonators operating under when the microchannel is filled with liquid. Liquid injection inside the microchannel of resonators brings lots of mechanical and electrical problems together. These problems are ca...
Fluid model of dc glow discharge with nonlocal ionization source term Rafatov, İsmail; KUDRYAVTSEV, A. A. (2012-06-29) We developed and tested a simple hybrid model for a glow discharge, which incorporates nonlocal ionization by fast electrons into the fluid framework. Calculations have been performed for an argon gas. Comparison with the experimental data as well as with the hybrid (particle) and fluid modelling results demonstated good applicability of the proposed model.
Non-linear viscoelasticity for epoxy-based polymers: theoretical modeling and numerical implementation Koral, Ateş; Dal, Hüsnü; Department of Mechanical Engineering (2019) The present thesis aims at modeling creep behaviour under hydrostatic and uniaxial loadings of a certain silica filled epoxy compound at various temperatures with numerical implementation of algorithms into finite element method. Time dependent behaviour of polymers has been examined and many approaches have been proposed by researchers. Some of the models are inspired from micro-mechanical structure of polymers. These models generally take relaxation of a single entangled chain in a polymer gel matrix upon...
STRUCTURAL MODIFICATIONS USING FREQUENCY-RESPONSE FUNCTIONS Özgüven, Hasan Nevzat (1990-01-01) A general method using frequency response functional (FRFs) is developed for reanalysing a structure subjected to structural modification. In this method, theoretically calculated or experimentally measured FRFs can be used in determining the FRFs of the modified structure. Structural modifications may be in the form of additional structural components which may be expressed in terms of additional mass, stiffness and damping matrices. The formulation is given for two possible cases where there are and are n...

Citation Formats

K. Cengiz and Y. Özyörük, “Detached eddy simulation using a high order low dissipation low dispersion computational method for aeroacoustic purposes,” presented at the AIAC′2015 Ankara International Aerospace Conference, Ankara, Türkiye, 2015, Accessed: 00, 2021. [Online]. Available: aiac.ae.metu.edu.tr/2015.