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DNS of vibrating grid turbulence

Khujadze, George and Oberlack, Martin :
DNS of vibrating grid turbulence.
In: Sixth International Symposium on Turbulence and Shear Flow Phenomena, 22-24 June 2009, Seoul, Korea. Sixth International Symposium on Turbulence and Shear Flow Phenomena. Seoul, Korea, 22-24 June 2009
[Conference or Workshop Item] , (2009)

Abstract

Results of direct numerical simulations (DNS) of vibrating grid turbulence are presented. Turbulence is generated at a grid in the x₁ - x₂ plane which vibrates normally to itself. There is no mean velocity in the flow. Hence, in a statistical sense turbulence is generated in a plane and diffuses out while at the same time gets damped due to dissipation. Due to zero mean shear there is no production of turbulence apart from the region at grid. Numerical simulations for two different Reynolds numbers (based on an amplitude and frequency of the grid) Re = 500, 1000 were performed using a spectral code. Statistics of turbulence was accumulated and the evolution of the turbulent/non-turbulent interface was detected and compared to the theoretical result obtained by Oberlack and Guenther (2003) using Lie group analysis. Good agreement was found between DNS and theoretical results.

Item Type: Conference or Workshop Item
Erschienen: 2009
Creators: Khujadze, George and Oberlack, Martin
Title: DNS of vibrating grid turbulence
Language: English
Abstract:

Results of direct numerical simulations (DNS) of vibrating grid turbulence are presented. Turbulence is generated at a grid in the x₁ - x₂ plane which vibrates normally to itself. There is no mean velocity in the flow. Hence, in a statistical sense turbulence is generated in a plane and diffuses out while at the same time gets damped due to dissipation. Due to zero mean shear there is no production of turbulence apart from the region at grid. Numerical simulations for two different Reynolds numbers (based on an amplitude and frequency of the grid) Re = 500, 1000 were performed using a spectral code. Statistics of turbulence was accumulated and the evolution of the turbulent/non-turbulent interface was detected and compared to the theoretical result obtained by Oberlack and Guenther (2003) using Lie group analysis. Good agreement was found between DNS and theoretical results.

Title of Book: Sixth International Symposium on Turbulence and Shear Flow Phenomena. Seoul, Korea, 22-24 June 2009
Divisions: 16 Department of Mechanical Engineering > Fluid Dynamics (fdy)
16 Department of Mechanical Engineering
Event Title: Sixth International Symposium on Turbulence and Shear Flow Phenomena
Event Location: Seoul, Korea
Event Dates: 22-24 June 2009
Date Deposited: 02 Sep 2011 13:07
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