Publication detail
New Inlet Boundary Condition Treatment for Large Eddy Simulation
VOLAVÝ, J. FORMAN, M. JÍCHA, M.
Czech 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
Czech 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 in Czech
Inlet boundary condition, Large Eddy Simulation
Keywords in English
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–to
37–38
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",
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"
}