Publication detail

New Inlet Boundary Condition Treatment for Large Eddy Simulation

VOLAVÝ, J. FORMAN, M. JÍCHA, M.

Original Title

New Inlet Boundary Condition Treatment for Large Eddy Simulation

English Title

New Inlet Boundary Condition Treatment for Large Eddy Simulation

Type

conference paper

Language

en

Original Abstract

This work describes new treatment of inlet boundary condition for Large Eddy Simulation. The turbulence on the inlet is forced by generation of the force in particular points of the computational domain and this force is added to the momentum equations as a source term. For the generation of the force is used Ornstein-Uhlenbeck process. Ornstein-Uhlenbeck process describes the distribution of velocity fluctuations in homogeneous turbulence flow. Instead of generating random velocity fluctuations which would lead to continuity error the Ornstein-Uhlenbeck process is used here for generating the forcing force. This approach allows easy implementation in solvers of turbulent flows. This proposed inlet boundary condition was implemented in Large Eddy Simulation solver in open-source program OpenFOAM and then used for simulation of channel flow. The results are validated against DNS data. The results obtained with proposed forcing show good agreement with DNS results. The part of this work is also parameter study of influence of each parameter on witch depend Ornstein-Uhlenbeck process and their impact on the resulting turbulence field

English abstract

This work describes new treatment of inlet boundary condition for Large Eddy Simulation. The turbulence on the inlet is forced by generation of the force in particular points of the computational domain and this force is added to the momentum equations as a source term. For the generation of the force is used Ornstein-Uhlenbeck process. Ornstein-Uhlenbeck process describes the distribution of velocity fluctuations in homogeneous turbulence flow. Instead of generating random velocity fluctuations which would lead to continuity error the Ornstein-Uhlenbeck process is used here for generating the forcing force. This approach allows easy implementation in solvers of turbulent flows. This proposed inlet boundary condition was implemented in Large Eddy Simulation solver in open-source program OpenFOAM and then used for simulation of channel flow. The results are validated against DNS data. The results obtained with proposed forcing show good agreement with DNS results. The part of this work is also parameter study of influence of each parameter on witch depend Ornstein-Uhlenbeck process and their impact on the resulting turbulence field

Keywords

Inlet boundary condition, Large Eddy Simulation

RIV year

2010

Released

20.10.2010

Publisher

Institute of thermomechanics, AS CR

Location

Praha

ISBN

978-80-87012-27-7

Book

Colloquium Fluid Dynamics 2010

Pages from

37

Pages to

38

Pages count

43

BibTex


@inproceedings{BUT35485,
  author="Jaroslav {Volavý} and Matěj {Forman} and Miroslav {Jícha}",
  title="New Inlet Boundary Condition Treatment for Large Eddy Simulation",
  annote="This work describes new treatment of inlet boundary condition for Large Eddy
Simulation. The turbulence on the inlet is forced by generation of the force in
particular points of the computational domain and this force is added to the
momentum equations as a source term. For the generation of the force is used
Ornstein-Uhlenbeck process. Ornstein-Uhlenbeck process describes the
distribution of velocity fluctuations in homogeneous turbulence flow. Instead of
generating random velocity fluctuations which would lead to continuity error the
Ornstein-Uhlenbeck process is used here for generating the forcing force. This
approach allows easy implementation in solvers of turbulent flows.
This proposed inlet boundary condition was implemented in Large Eddy Simulation
solver in open-source program OpenFOAM and then used for simulation of channel
flow. The results are validated against DNS data. The results obtained with
proposed forcing show good agreement with DNS results. The part of this work is
also parameter study of influence of each parameter on witch depend
Ornstein-Uhlenbeck process and their impact on the resulting turbulence field",
  address="Institute of thermomechanics, AS CR",
  booktitle="Colloquium Fluid Dynamics 2010",
  chapter="35485",
  howpublished="print",
  institution="Institute of thermomechanics, AS CR",
  year="2010",
  month="october",
  pages="37--38",
  publisher="Institute of thermomechanics, AS CR",
  type="conference paper"
}