Numerical Simulation for Impact of Elastic Deformable Body against Rigid Wall under Fluid Dynamic Force

2006 ◽  
pp. 375-380 ◽  
Author(s):  
Tomohisa Hashimoto ◽  
Koji Morinishi ◽  
Nobuyuki Satofuka
Keyword(s):  
Numerical Simulation ◽  
Fluid Dynamic ◽  
Deformable Body ◽  
Rigid Wall ◽  
Dynamic Force

Numerical Simulation of Thermal and Fluid-Dynamic Behaviour of Reciprocating Compressor

2000 ◽  
Author(s):  
Zhilong He ◽  
Xueyuan Peng ◽  
Pengcheng Shu
Keyword(s):  
Numerical Simulation ◽  
Fluid Flow ◽  
Heat Balance ◽  
Dynamic Behaviour ◽  
Fluid Dynamic ◽  
Reciprocating Compressor ◽  
One Dimensional ◽  
Compressor Design ◽  
Suction Line ◽  
Hermetic Compressor

Abstract This paper presents a numerical method for simulating the thermal and fluid-dynamic behavior of hermetic compressors in the whole compressor domain. The model of fluid flow is developed by integrating transient one-dimensional conservation equations of continuity, momentum and energy through all of the elements from suction line to discharge line. The model describing thermal behavior is based on heat balance in the components such as muffler, connecting tubes and orifices. The calculation of the thermodynamic and transport properties for different refrigerants at various conditions has been considered, and some numerical results for a hermetic compressor are presented. The present study has demonstrated that the numerical simulation is a fest and reliable tool for compressor design.

Vortical Fluid-Dynamic Force and Moment

2015 ◽  
pp. 283-323
Author(s):  
Jie-Zhi Wu ◽  
Hui-Yang Ma ◽  
Ming-De Zhou
Keyword(s):  
Fluid Dynamic ◽  
Dynamic Force

On Viscoelastic Compliant Contact-Impact Models

2004 ◽  
Vol 71 (1) ◽  
pp. 134-138 ◽  
Author(s):  
T. M. Atanackovic ◽  
D. T. Spasic
Keyword(s):  
Deformable Body ◽  
Viscoelastic Body ◽  
Rigid Wall ◽  
Straight Line ◽  
The Laplace Transform ◽  
Contact Impact ◽  
The Impact ◽  
Derivatives Of ◽  
Impact Models ◽  
Straight Rod

We study dynamics of a mass, moving on a straight line, and impacting against the rigid wall through a deformable body, that we model as a straight rod of negligible mass. The chosen constitutive model of the viscoelastic body comprises fractional derivatives of stress and strain and the restrictions on the coefficients that follow from Clausius Duhem inequality. We show that the dynamics of the problem is governed by a single differential equation of real order. The obtained equation was solved numerically. The comparison is made to the solution obtained by the Laplace transform and Post’s inversion formula. The predictions of the model concerning the duration of the impact, maximal values of the impacting force and deformation as well as the restitution coefficient are determined for several values of system parameters.

Study on the Fluidelastic Vibration of Tube Arrays Using Modal Analysis Technique

1984 ◽  
Vol 106 (1) ◽  
pp. 17-24 ◽  
Author(s):  
K. Ohta ◽  
K. Kagawa ◽  
H. Tanaka ◽  
S. Takahara
Keyword(s):  
Modal Analysis ◽  
Heat Exchangers ◽  
Vibration Mode ◽  
Fluid Dynamic ◽  
Cross Flow ◽  
Dynamic Force ◽  
Reversed Flow ◽  
Critical Flow Velocity ◽  
Analysis Technique ◽  
Tube Arrays

This paper presents a method to calculate the critical flow velocity of fluidelastic vibration of tube arrays in heat exchangers. The method is based upon the modal analysis technique, which combines the fluid dynamic force caused by cross flow and the vibration characteristics of the complicated tube array to obtain its response. The analytical method enables us not only to take into account the vibration mode of tube array and nonuniformity of velocity and density distribution of cross flow, but also to estimate the effect of antivibration devices, such as spacer, connecting band, and so on. Numerical examples of constrained single-tube array, multi-tube array in reversed flow, and group of panels with spacers are described.

Unsteady Cavitating Flow Around an Inclined Rectangular Cylinder

Volume 3 ◽  
2004 ◽  
Author(s):  
Terukazu Ota ◽  
Isao Tsubura ◽  
Hiroyuki Yoshikawa
Keyword(s):  
Separation Bubble ◽  
Fluid Dynamic ◽  
Flow Characteristics ◽  
Low Frequency ◽  
Cavitation Number ◽  
Cavitating Flow ◽  
Dynamic Force ◽  
Unstable Flow ◽  
Rectangular Cylinder ◽  
Cavity Configuration

Unsteady characteristics of cavitating flow around an inclined rectangular cylinder with a width to height ratio of 8.0 were experimentally investigated for various angles of attack and cavitation numbers. Measurements of fluid dynamic force and surface pressure were made and the cavity configuration was observed with a camera. Especially considered are the self-oscillating unstable flow characteristics along with the time variation of cavity configuration. It is found that a severe vibration occurs at some cavitation number, in which the attached cavity is formed in the separation bubble. As the cavitation number further decreases, the low frequency fluctuation of flow occurs.

Using Nonlinear Contact Mechanics in Process of Tool Edge Movement on Deformable Body to Analysis of Cutting and Sliding Burnishing Processes

2014 ◽  
Vol 474 ◽  
pp. 339-344 ◽  
Author(s):  
Jaroslaw Chodor ◽  
Leon Kukielka
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Surface Layer ◽  
Numerical Methods ◽  
Contact Problem ◽  
Deformable Body ◽  
Comprehensive Analysis ◽  
Tool Edge ◽  
Nonlinear Contact ◽  
Performance Conditions

Properties of the surface layer after cutting or sliding burnishing depend mainly on type of process and its performance conditions. For its comprehensive analysis is necessary to develop an adequate mathematical model and numerical methods of solving it. A common feature of both processes is moving the tool edge on elastic/visco-plastic workpiece. However, these processes are different i.e. the chip formation or chipless forming, therefore, different properties of surface layer depend mainly on: the geometry of the tool edge and its workpiece relative and depth of process. Therefore, this article is about the application of an incremental modelling and numerical solution of the contact problem between movable rigid and elastic/visco-plastic bodies developed in [ to the numerical simulation of physical process of moving a rigid tool on the workpiece.

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