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EXPERIMENTAL VERIFICATION OF TURBULENCE MODELING FOR THE FLOW THROUGH A POROUS MEDIA BY USING PTV

Sota Nakajo
Disaster Prevention Research Institute Kyoto University Gokasho, Uji, Kyoto, 611-0013-Japan

Takaaki Shigematsu
Graduate school of Engineering Osaka City University 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585 Japan

Abstract

Distribution of turbulent properties in a porous media has not been clear at all. Therefore most of existing turbulence models for a porous media flow which many researchers have proposed were macroscopic models based on the knowledge of pressure drop along a porous media. In the present study, we validated a linear and a nonlinear turbulence models by a priori testing based on the measurement data of velocity inside a porous media using a high resolution PTV with the refractive index matching method. As a result, it was cleared that a nonlinear turbulence model with nonlinear velocity gradient agree to the experimental results much better than a linear turbulence model for the flow passing through a porous media. Moreover, it was presented that the coefficient in the nonlinear model is constant and independent with the Reynolds number and spatial averaging area size.