scholarly journals FSI Computation and Experimental Verification of Fluid Flow in Flexible Tubes

2020 ◽  
Vol 20 (3) ◽  
pp. 104-114
Author(s):  
Dominik Šedivý ◽  
Simona Fialová ◽  
Roman Klas ◽  
Michal Kotek
Keyword(s):  
Fluid Flow ◽  
Large Deformations ◽  
Computational Study ◽  
Experimental Testing ◽  
Material Model ◽  
Tube Material ◽  
Experimental Stand ◽  
Flexible Walls ◽  
Newtonian Liquids ◽  
Flexible Tubes

AbstractPresented paper is focused on the experimental and computational study of fluid flow in pipes with flexible walls. One possible real example of this phenomenon is the blood flow in arteries or their substitutes in the human body. The artery material itself should be understood as anisotropic and heterogeneous. Therefore, the experiment was carried out on the deforming tube, made of silicone (polydimethylsiloxane - PDMS). Obtained results and observed events were verified by numerical FSI simulations. Due to the large deformations occurring during loading of the tube, it was necessary to work with a dynamic mesh in the CFD part. Based on experimental testing of the tube material, a non-Hookean and Mooney-Rivlin material model were considered. Blood flowing in vessels is a heterogeneous liquid and exhibits non-Newtonian properties. In the real experimental stand has been somewhat simplified. Water, chosen as the liquid, belongs to the Newtonian liquids. The results show mainly comparisons of unsteady velocity profiles between the experiment and the numerical model.

scholarly journals A Finite Element Study of Micropipette Aspiration of Single Cells: Effect of Compressibility

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Amirhossein Jafari Bidhendi ◽  
Rami K. Korhonen
Keyword(s):  
Fluid Flow ◽  
Large Deformations ◽  
Large Strain ◽  
Single Cells ◽  
Material Model ◽  
Cell Types ◽  
Micropipette Aspiration ◽  
Bulk Relaxation ◽  
Optimal Material ◽  
Different Cell Types

Micropipette aspiration (MA) technique has been widely used to measure the viscoelastic properties of different cell types. Cells experience nonlinear large deformations during the aspiration procedure. Neo-Hookean viscohyperelastic (NHVH) incompressible and compressible models were used to simulate the creep behavior of cells in MA, particularly accounting for the effect of compressibility, bulk relaxation, and hardening phenomena under large strain. In order to find optimal material parameters, the models were fitted to the experimental data available for mesenchymal stem cells. Finally, through Neo-Hookean porohyperelastic (NHPH) material model for the cell, the influence of fluid flow on the aspiration length of the cell was studied. Based on the results, we suggest that the compressibility and bulk relaxation/fluid flow play a significant role in the deformation behavior of single cells and should be taken into account in the analysis of the mechanics of cells.

Computational study on fluid flow and heat transfer characteristic of hollow structured packed bed

2019 ◽  
Vol 344 ◽  
pp. 463-474 ◽  
Author(s):  
Zehua Guo ◽  
Zhongning Sun ◽  
Nan Zhang ◽  
Ming Ding ◽  
Haozhi Bian ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Heat Transfer Characteristic ◽  
Computational Study ◽  
Packed Bed ◽  
Transfer Characteristic ◽  
Flow And Heat Transfer

Computational Design and Analysis of Nitinol-Based Arch Wedge Support

2018 ◽  
Author(s):  
Tyler Stranburg ◽  
Yucheng Liu ◽  
Harish Chander ◽  
Adam Knight
Keyword(s):  
Boundary Conditions ◽  
Mechanical Response ◽  
Computational Study ◽  
Experimental Testing ◽  
Permanent Deformation ◽  
Computational Design ◽  
Element Analysis ◽  
Human Movements ◽  
First Time ◽  
Human Motions

A nitinol-based arch wedge support (AWS) was designed using computational approach. Finite element analysis (FEA) was performed to on this design to assess the influence of loading, boundary conditions, and thickness on the mechanical response of the computer-aid design (CAD) model. Five loading conditions caused by different human movements, two boundary conditions, and three thicknesses are involved in this computational study. FEA results showed that the presented AWS design can resist forces caused by different human motions without generating any permanent deformation. The study features the first time to design and evaluate a thin-walled nitinol AWS model. The results of this study form the background of prototyping and experimental testing of the design in the next phase.

Two-layer spin coating flow of Newtonian liquids: A computational study

2016 ◽  
Vol 131 ◽  
pp. 180-189 ◽  
Author(s):  
Subhadarshinee Sahoo ◽  
Akash Arora ◽  
Pankaj Doshi
Keyword(s):  
Spin Coating ◽  
Computational Study ◽  
Coating Flow ◽  
Newtonian Liquids

Brushless Servomotor’s Thermal Behavior Computer Assisted Evaluation for a Linear Motion NC Axis Experimental Stand

2015 ◽  
Vol 762 ◽  
pp. 21-26 ◽  
Author(s):  
Florin Adrian Nicolescu ◽  
Georgia Cezara Avram ◽  
Andrei Mario Ivan ◽  
Adrian Theodor Mantea
Keyword(s):  
Thermal Behavior ◽  
Experimental Testing ◽  
Ball Screw ◽  
Evaluation Procedure ◽  
Computer Assisted ◽  
Linear Motion ◽  
Specific Calculation ◽  
Experimental Stand ◽  
Thermal Energy Dissipation ◽  
Testing Stand

The paper presents works carried out by the authors in the field of NC axes’ structural and functional optimization. This paper includes the results obtained by using a MathCAD application (developed in the doctoral thesis of the second author) for the servomotor's thermal behavior computer assisted evaluation. The analyzed servomotor is included in the driving system of a linear motion NC axis experimental testing stand, (existing in MMS department from EMTS Faculty). The NC axis of the experimental stand integrates a FAGOR brushless servomotor, a 1:1 ratio belt drive intermediary transmission, a ball screw - bearings assembly (lead screw - ball nut - bearings) and a driven element guided through a ball rail system. The MathCAD application was developed in order to perform specific calculation for servomotor's thermal energy dissipation and maximum operating temperature evaluation, and allows to perform the assisted final check and optimum selection of the electrical driving servomotors based on these results. The paper presents, through some screenshots from running the MathCAD application, the computer assisted evaluation procedure and results of the brushless servomotor's thermal behavior analysis corresponding to analyzed NC axis (included in the experimental stand).

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