Numerical Simulation of Vortex-Induced Vibration and Torsional Flutter of Rectangular Cross-Sections by k-ε Model

2003 ◽  
Author(s):  
Kenji Shimada ◽  
Takeshi Ishihara
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Cross Sections ◽  
Present Method ◽  
Free Vibrations ◽  
Shear Layer Instability ◽  
Vortex Induced Vibration ◽  
Vortex Induced Vibrations ◽  
Karman Vortex ◽  
Occurrence Mechanism

In this paper, torsional aeroelastic vibration is investigated by wind tunnel experiment and numerical analysis which incorporates 2-dimensional modified k-ε model. Experimental results shows that the torsional vortex-induced vibration are classified into several groups. Harmonics and of the Karman-vortex or impinging-shear-layer-instability are found to be involved with the occurrence mechanism of these instabilities. Two types of rectangular cross-sections are chosen to examine the applicability of the numerical method. Unsteady wind forces, pressure distribution and free vibrations are compared with experiments. Although the present method is 2-dimensional, vortex-induced vibrations and torsional flutter were well simulated by the method.

A Study of Propagating Speed of Rotating Cavitation Based on Numerical Analysis

2009 ◽  
Author(s):  
Yuka Iga ◽  
Yoshiki Yoshida
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Propagation Speed ◽  
Rotating Stall ◽  
Numerical Results ◽  
Rotating Speed ◽  
Occurrence Mechanism

In this study, by reproducing flowfields of several kinds of cavitation instabilities by numerical simulation of unsteady cavitation in three blades cyclic cascade, occurrence mechanism of rotating cavitations in cascade are attempted to clarify. “The order of appearance of rotating cavitations” and “the discontinuity of the propagation speed at the transition” are still not clarified. From the present study, it is found that they can be explained by existence of latent rotating-stall and decrease of frequency of cavity break-off with development of the cavity. And our numerical results agree with the predicted rotating speed of rotating cavitation and break-off frequency of cavitation. Additionally, difference of sub-synchronous rotating cavitation and rotating-stall cavitation, they are both sub-synchronous phenomenon but have different propagation speed, is explained according to their occurrence mechanism.

Numerical Simulation of Vortex-Induced Vibration for Two Circular Cylinder in Tandem Arrangement

2011 ◽  
Vol 94-96 ◽  
pp. 1701-1706
Author(s):  
Jing Zhao ◽  
Hai Yan Guo ◽  
Xiao Min Li
Keyword(s):  
Numerical Simulation ◽  
Circular Cylinder ◽  
Dynamic Response ◽  
Present Method ◽  
Tandem Arrangement ◽  
Vortex Induced Vibration ◽  
Single Cylinder

The vortex-induced vibration of a single and a pair of equal-sized circular cylinder separated by 5.5D in tandem arrangement is investigated. The computations are carried out for various values of reduced velocity of the oscillator (Ur=1.85~9.7). The results of numerical simulation for a single cylinder by the present method are observed close to the data of experiment. And then, the dynamic response and force coeeficient of two cylinders can be achived by the same method. The results show that the upstream cylinder responds qualitatively similarly to a single cylinder. While the downstream cylinder shows a different behavior. All kinds of cylinders undergo a figure of 8 motion.

Numerical analysis of free vibrations of rectangular plates based on different approaches

2019 ◽  
pp. 33-41
Author(s):  
Oleksandr Grigorenko ◽  
◽  
Maksym Borysenko ◽  
Olena Boychuk ◽  
Volodymyr Novytskyi ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Free Vibrations ◽  
Rectangular Plates

Simulation of a Free Standing Riser Model and Validation With Experimental Results

2014 ◽  
Author(s):  
Marcio Yamamoto ◽  
Sotaro Masanobu ◽  
Satoru Takano ◽  
Shigeo Kanada ◽  
Tomo Fujiwara ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Previous Experiment ◽  
Numerical Results ◽  
Experimental Results ◽  
Previous Article ◽  
Scale Model ◽  
Analysis Software ◽  
Free Standing ◽  
Reduced Scale

In this article, we present the numerical analysis of a Free Standing Riser. The numerical simulation was carried out using a commercial riser analysis software suit. The numerical model’s dimensions were the same of a 1/70 reduced scale model deployed in a previous experiment. The numerical results were compared with experimental results presented in a previous article [1]. Discussion about the model and limitations of the numerical analysis is included.

Vibro-Stone Column Reinforcement Mechanism and Numerical Analysis

2012 ◽  
Vol 446-449 ◽  
pp. 1940-1943
Author(s):  
Yang Liu ◽  
Hong Xiang Yan
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Pore Pressure ◽  
Numerical Procedure ◽  
Numerical Results ◽  
Excess Pore Pressure ◽  
Stone Column ◽  
Reinforcement Mechanism ◽  
Consolidation Theory ◽  
Excess Pore

Numerical simulation of vibro-stone column is taken to simulate the installation of vibro-stone column. A relationship based on test is adopted to calculate the excess pore pressure induced by vibratory energy during the installation of vibro-stone column. A numerical procedure is developed based on the formula and Terzaghi-Renduric consolidation theory. Finally numerical results of composite stone column are compared single stone column.

On Numerical Simulation of the Stepped Soil-Nail Wall

2013 ◽  
Vol 353-356 ◽  
pp. 692-695
Author(s):  
Chang Zhi Zhu ◽  
Quan Chen Gao
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Internal Force ◽  
Numerical Results ◽  
Analysis Model ◽  
Foundation Pit ◽  
Soil Nails ◽  
Soil Nail ◽  
Soil Nail Wall ◽  
Design And Construction

Based on an Engineering Example which was supported by the stepped soil-nail wall, a numerical analysis model was established by FLAC3D,and the process of the excavation and supporting was simulated, and the numerical results of the soil nails internal force and foundation pit deformation were obtained. The simulated result was consistent with the measured results. It shows that the method of FLAC3D numerical analysis can be used to the numerical analysis of foundation pit excavation and supporting, and it will provide the basis for the design and construction of practice project.

Evaluation of Motorized Rotating Pancake Coil Probe Signals Simulated by Numerical Analysis in Steam Generator Tubes

2006 ◽  
Vol 321-323 ◽  
pp. 451-454
Author(s):  
Joo Young Yoo ◽  
Sung Jin Song ◽  
Chang Hwan Kim ◽  
Hee Jun Jung ◽  
Young Hwan Choi ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Steam Generator ◽  
Integral Method ◽  
Volume Integral ◽  
Analysis Software ◽  
Steam Generator Tubes ◽  
Calibration Tool ◽  
High Possibility ◽  
Good Agreement

In the present study, the synthetic signals from the combo tube are simulated by using commercial electromagnetic numerical analysis software which has been developed based on a volume integral method. A comparison of the simulated signals to the experiments is made for the verification of accuracy, and then evaluation of five deliberated single circumferential indication signals is performed to explore a possibility of using a numerical simulation as a practical calibration tool. The good agreement between the evaluation results for two cases (calibration done by experiments and calibration made by simulation) demonstrates such a high possibility.

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