Detail publikace

New Inlet Boundary Condition Treatment for Large Eddy Simulation

VOLAVÝ, J. FORMAN, M. JÍCHA, M.

Český název

New Inlet Boundary Condition Treatment for Large Eddy Simulation

Anglický název

New Inlet Boundary Condition Treatment for Large Eddy Simulation

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

en

Originální abstrakt

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

Český abstrakt

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

Anglický abstrakt

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

Klíčová slova česky

Inlet boundary condition, Large Eddy Simulation

Klíčová slova anglicky

Inlet boundary condition, Large Eddy Simulation

Rok RIV

2010

Vydáno

20.10.2010

Nakladatel

Institute of thermomechanics, AS CR

Místo

Praha

ISBN

978-80-87012-27-7

Kniha

Colloquium Fluid Dynamics 2010

Strany od–do

37–38

Počet stran

43

BIBTEX


@inproceedings{BUT35485,
  author="Jaroslav {Volavý} and Matěj {Forman} and Miroslav {Jícha},
  title="New Inlet Boundary Condition Treatment for Large Eddy Simulation",
  booktitle="Colloquium Fluid Dynamics 2010",
  year="2010",
  month="October",
  pages="37--38",
  publisher="Institute of thermomechanics, AS CR",
  address="Praha",
  isbn="978-80-87012-27-7"
}