A Dynamic Variational Multiscale Model in Turbulent Channel Flow with Distorted Grids

Ghader Ghorbaniasl; Patryk Widera; Kris Van Den Abeele; Christian Lacor

A Dynamic Variational Multiscale Model in Turbulent Channel Flow with Distorted Grids

Ghader Ghorbaniasl, Patryk Widera, Kris Van Den Abeele, Christian Lacor

Applied Mechanics

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

Abstract

The present paper focuses on a dynamic version of the variational multiscale model and
investigates its performance in large eddy simulations (LES) of turbulent channel flow at
Re=180 and 395. One base regular grid and three different distorted grids are employed in
the evaluations. The model is assessed and compared to the direct numerical simulation
(DNS) data and to the conventional dynamic Smagorinsky model. Having the error
components involved in LES, the grid irregularity effect on the shortcoming of the subgrid
scale models and the error of numerical approximation is also assessed. A main outcome is
that the dynamic multiscale model in comparison with the dynamic Smagorinsky model is
less affected by grid distortion, leading to better behavior on the irregular grids.

Original language	English
Title of host publication	47th AIAA Aerospace Sciences Meeting and Exhibit, 5-8 January 2009, Orlando, Florida
Publication status	Published - 7 Jan 2009
Event	Finds and Results from the Swedish Cyprus Expedition: A Gender Perspective at the Medelhavsmuseet - Stockholm, Sweden Duration: 21 Sep 2009 → 25 Sep 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

large eddy simulation
variational multiscale

Cite this

@inproceedings{e011912453b04cd78fdde47246afcdc1,

title = "A Dynamic Variational Multiscale Model in Turbulent Channel Flow with Distorted Grids",

abstract = "The present paper focuses on a dynamic version of the variational multiscale model and investigates its performance in large eddy simulations (LES) of turbulent channel flow at Re=180 and 395. One base regular grid and three different distorted grids are employed in the evaluations. The model is assessed and compared to the direct numerical simulation (DNS) data and to the conventional dynamic Smagorinsky model. Having the error components involved in LES, the grid irregularity effect on the shortcoming of the subgrid scale models and the error of numerical approximation is also assessed. A main outcome is that the dynamic multiscale model in comparison with the dynamic Smagorinsky model is less affected by grid distortion, leading to better behavior on the irregular grids.",

keywords = "large eddy simulation, variational multiscale",

author = "Ghader Ghorbaniasl and Patryk Widera and {Van Den Abeele}, Kris and Christian Lacor",

year = "2009",

month = jan,

day = "7",

language = "English",

booktitle = "47th AIAA Aerospace Sciences Meeting and Exhibit, 5-8 January 2009, Orlando, Florida",

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 - A Dynamic Variational Multiscale Model in Turbulent Channel Flow with Distorted Grids

AU - Ghorbaniasl, Ghader

AU - Widera, Patryk

AU - Van Den Abeele, Kris

AU - Lacor, Christian

PY - 2009/1/7

Y1 - 2009/1/7

N2 - The present paper focuses on a dynamic version of the variational multiscale model and investigates its performance in large eddy simulations (LES) of turbulent channel flow at Re=180 and 395. One base regular grid and three different distorted grids are employed in the evaluations. The model is assessed and compared to the direct numerical simulation (DNS) data and to the conventional dynamic Smagorinsky model. Having the error components involved in LES, the grid irregularity effect on the shortcoming of the subgrid scale models and the error of numerical approximation is also assessed. A main outcome is that the dynamic multiscale model in comparison with the dynamic Smagorinsky model is less affected by grid distortion, leading to better behavior on the irregular grids.

AB - The present paper focuses on a dynamic version of the variational multiscale model and investigates its performance in large eddy simulations (LES) of turbulent channel flow at Re=180 and 395. One base regular grid and three different distorted grids are employed in the evaluations. The model is assessed and compared to the direct numerical simulation (DNS) data and to the conventional dynamic Smagorinsky model. Having the error components involved in LES, the grid irregularity effect on the shortcoming of the subgrid scale models and the error of numerical approximation is also assessed. A main outcome is that the dynamic multiscale model in comparison with the dynamic Smagorinsky model is less affected by grid distortion, leading to better behavior on the irregular grids.

KW - large eddy simulation

KW - variational multiscale

M3 - Conference paper

BT - 47th AIAA Aerospace Sciences Meeting and Exhibit, 5-8 January 2009, Orlando, Florida

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

Y2 - 21 September 2009 through 25 September 2009

ER -

A Dynamic Variational Multiscale Model in Turbulent Channel Flow with Distorted Grids

Abstract

Conference

Keywords

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Cite this