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Research Papers: Techniques and Procedures

Application of MI Simulation Using a Turbulent Model for Unsteady Orifice Flow

[+] Author and Article Information
Mitsuhiro Nakao

Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama 2268503, Japannakao.m.aa@m.titech.ac.jp

Kenji Kawashima, Toshiharu Kagawa

Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama 2268503, Japan

J. Fluids Eng 131(11), 111401 (Oct 30, 2009) (6 pages) doi:10.1115/1.4000259 History: Received August 26, 2008; Revised August 06, 2009; Published October 30, 2009

Measurement-integrated (MI) simulation is a numerical simulation in which experimental results are fed back to the simulation. The calculated values become closer to the experimental values. In the present paper, MI simulation using a turbulent model is proposed and applied to steady and unsteady oscillatory airflows passing an orifice plate in a pipeline. Velocity and pressure feedbacks are conducted and both feedback methods showed good agreement with the experimental results. Moreover, the calculation times between the MI simulation and ordinary simulation were compared in steady and unsteady conditions. The calculation time was demonstrated to be significantly reduced compared with ordinary simulation.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 2

Calculation algorithm

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Figure 3

Measurement points

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Figure 4

Experimental apparatus for steady flow

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Figure 6

Comparisons of several methods: (a) axial velocity at point F and (b) pressure at point R

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Figure 7

Comparison of velocity (left) and pressure (right) distribution downstream of the orifice

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Figure 8

Apparatus of the unsteady flow generator

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Figure 9

Experimental apparatus for unsteady flow

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Figure 10

Flow generation results with an average flow rate of 8.5×10−3 m3/s, an amplitude of 1.6×10−3 m3/s, and a frequency of 0.5 Hz

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Figure 11

Comparisons of x-direction velocities obtained by several methods: (a) at point C and (b) at point F

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Figure 12

Comparisons of pressures between several methods: (a) at point O and (b) at point P

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Figure 13

Comparisons of increment time: (a) velocity feedback, (b) pressure feedback

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