Stochastic generation of velocity fluctuation for turbulent inflow and initial condition

Mani Fathali; M. Klein; Tim Broeckhoven; Christian Lacor; Martine Baelmans

Stochastic generation of velocity fluctuation for turbulent inflow and initial condition

Mani Fathali, M. Klein, Tim Broeckhoven, Christian Lacor, Martine Baelmans

Applied Mechanics

Research output: Chapter in Book/Report/Conference proceeding › Conference paper

Abstract

Direct or large eddy simulation of a turbulent °ow ¯eld is strongly
in°uenced by its initial or in°ow boundary condition. This paper aims to present a
new stochastic approach to generate an arti¯cial turbulent velocity ¯eld for initial
or in°ow boundary condition based on digital ¯ltering. The generated velocity ¯eld
reproduces locally desired Reynolds-stress components and integral length scales
including cross-integral length scales. The method appears to be simple, °exible and
more accurate in comparison with previously developed methods. The accuracy and
performance of the method is demonstrated by Direct Numerical Simulation(DNS)
of a homogeneous turbulent shear °ow. To assess the accuracy and performance of
the method, simulation results are compared with a reference simulation.

Original language	English
Title of host publication	Proc. Of ICCFD4 Conf., 10-13 july, Ghent
Publication status	Published - 2006
Event	Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet - Stockholm, Sweden Duration: 21 Sept 2009 → 25 Sept 2009

Conference

Conference	Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet
Country/Territory	Sweden
City	Stockholm
Period	21/09/09 → 25/09/09

Keywords

cfd
LES
inlet condition
stochastic

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@inproceedings{5f016586f94b4892974d94c46dab6c34,

title = "Stochastic generation of velocity fluctuation for turbulent inflow and initial condition",

abstract = "Direct or large eddy simulation of a turbulent °ow ¯eld is strongly in°uenced by its initial or in°ow boundary condition. This paper aims to present a new stochastic approach to generate an arti¯cial turbulent velocity ¯eld for initial or in°ow boundary condition based on digital ¯ltering. The generated velocity ¯eld reproduces locally desired Reynolds-stress components and integral length scales including cross-integral length scales. The method appears to be simple, °exible and more accurate in comparison with previously developed methods. The accuracy and performance of the method is demonstrated by Direct Numerical Simulation(DNS) of a homogeneous turbulent shear °ow. To assess the accuracy and performance of the method, simulation results are compared with a reference simulation.",

keywords = "cfd, LES, inlet condition, stochastic",

author = "Mani Fathali and M. Klein and Tim Broeckhoven and Christian Lacor and Martine Baelmans",

year = "2006",

language = "English",

booktitle = "Proc. Of ICCFD4 Conf., 10-13 july, Ghent",

note = "Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet ; Conference date: 21-09-2009 Through 25-09-2009",

}

TY - GEN

T1 - Stochastic generation of velocity fluctuation for turbulent inflow and initial condition

AU - Fathali, Mani

AU - Klein, M.

AU - Broeckhoven, Tim

AU - Lacor, Christian

AU - Baelmans, Martine

PY - 2006

Y1 - 2006

N2 - Direct or large eddy simulation of a turbulent °ow ¯eld is strongly in°uenced by its initial or in°ow boundary condition. This paper aims to present a new stochastic approach to generate an arti¯cial turbulent velocity ¯eld for initial or in°ow boundary condition based on digital ¯ltering. The generated velocity ¯eld reproduces locally desired Reynolds-stress components and integral length scales including cross-integral length scales. The method appears to be simple, °exible and more accurate in comparison with previously developed methods. The accuracy and performance of the method is demonstrated by Direct Numerical Simulation(DNS) of a homogeneous turbulent shear °ow. To assess the accuracy and performance of the method, simulation results are compared with a reference simulation.

AB - Direct or large eddy simulation of a turbulent °ow ¯eld is strongly in°uenced by its initial or in°ow boundary condition. This paper aims to present a new stochastic approach to generate an arti¯cial turbulent velocity ¯eld for initial or in°ow boundary condition based on digital ¯ltering. The generated velocity ¯eld reproduces locally desired Reynolds-stress components and integral length scales including cross-integral length scales. The method appears to be simple, °exible and more accurate in comparison with previously developed methods. The accuracy and performance of the method is demonstrated by Direct Numerical Simulation(DNS) of a homogeneous turbulent shear °ow. To assess the accuracy and performance of the method, simulation results are compared with a reference simulation.

KW - cfd

KW - LES

KW - inlet condition

KW - stochastic

M3 - Conference paper

BT - Proc. Of ICCFD4 Conf., 10-13 july, Ghent

T2 - Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet

Y2 - 21 September 2009 through 25 September 2009

ER -

Stochastic generation of velocity fluctuation for turbulent inflow and initial condition

Abstract

Conference

Keywords

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