Numerical Simulation of Pulsating Flow over Blood Vessel Robot

2012 ◽  
Vol 591-593 ◽  
pp. 1734-1738
Author(s):  
Chun Yan Huang ◽  
Fan Jiang
Keyword(s):  
Numerical Simulation ◽  
Boundary Condition ◽  
Blood Flow ◽  
Blood Vessel ◽  
Surface Pressure ◽  
Blood Parameters ◽  
Pulsating Flow ◽  
Inlet Velocity ◽  
Blood Density

In order to study the influence of pulsating blood flow to robot and blood vessel, UDF programming of the inlet velocity is defined as the boundary condition, and the model simulate the turbulent blood flow. Moreover, in this situation, this paper analyzes the influence caused by blood parameters for the biggest surface pressure on robot. The results are showed that the variation of pressure and velocity is different on different position at 0.08s and 0.27s, and the surface pressure of the robot become greater by the increase of blood density or viscosity.

Three Dimensional Simulation of Blood Flow in the Small Arteries of a Truncated Vascular System With Three Levels of Bifurcation

2014 ◽  
Author(s):  
Kamil Kahveci ◽  
Bryan R. Becker
Keyword(s):  
Boundary Condition ◽  
Blood Flow ◽  
Blood Vessel ◽  
Velocity Profile ◽  
Flow Velocity ◽  
Blood Flow Velocity ◽  
Vascular System ◽  
Three Dimensional ◽  
Simulation Software ◽  
Small Arteries

Three dimensional blood flow in a truncated vascular system is investigated numerically using a commercially available finite element analysis and simulation software. The vascular system considered in this study has three levels of symmetric bifurcation. Geometric parameters for daughter vessels, such as their diameters and their angles of bifurcation, are specified according to Murray’s law based on the principle of minimum work. The ratio of blood vessel length to diameter is based upon experimental data found in the literature. An experimentally obtained velocity profile, available in the literature, is used as the inlet boundary condition. An outflow boundary model, consisting of a contraction tube to represent the pressure drop of the small arteries, arterioles, and capillaries that would follow the truncated vascular system, is used to specify the boundary condition at the eight outlets. The results show that although the blood flow velocity experiences a sudden decrease after the bifurcation points due to the higher total cross-sectional area of the daughter vessels as compared to the parent vessel, this decrease in velocity is partially recovered due to the tapering of the blood vessels as they approach the next bifurcation point. The results also show that the secondary flow which is typical after the bifurcation of large arteries does not develop after the bifurcation of small arteries due to the presence of laminar blood flow with very low Reynolds number in the small arteries. The numerical model yields pressure distributions and pressure drops along the vascular system that agree quite well with the physiological data found in the literature. Finally, the results show that, immediately following a bifurcation, the blood flow velocity profile is not symmetrical about the longitudinal axes of blood vessel. However, symmetry is recovered as the blood flow proceeds down the vessel.

Numerical simulation of physiologically relevant pulsatile flow of blood with shear-rate-dependent viscosity in a stenosed blood vessel

2018 ◽  
Vol 11 (06) ◽  
pp. 1850082
Author(s):  
Subrata Mukhopadhyay ◽  
Mani Shankar Mandal ◽  
Swati Mukhopadhyay
Keyword(s):  
Numerical Simulation ◽  
Blood Flow ◽  
Blood Vessel ◽  
Pulsatile Flow ◽  
Time Dependent ◽  
Governing Equations ◽  
Rate Dependent ◽  
Realistic Situation ◽  
Newtonian Case ◽  
Dependent Viscosity

Pulsatile flow of blood in a blood vessel having time-dependent shape (diameter) is investigated numerically in order to understand some important physiological phenomena in arteries. A smooth axi-symmetric cosine shaped constriction is considered. To mimic the realistic situation as far as possible, viscosity of blood is taken to be non-uniform, a shear-thinning viscosity model is considered and a physiologically relevant pulsatile flow is introduced. Taking advantage of axi-symmetry in the proposed problem, the stream function–vorticity formulation is used to solve the governing equations for blood flow. Effect of different parameters associated with the problem on the flow pattern has been investigated and disparities from the Newtonian case are discussed in detail.

Hemodynamics Numerical Simulation of Stenosis Bifurcation

2015 ◽  
Author(s):  
Krunal Chaudhari ◽  
Hardikkumar Patel
Keyword(s):  
Blood Flow ◽  
Cardiovascular Diseases ◽  
Blood Vessel ◽  
Model Parameters ◽  
Aortic Atherosclerosis ◽  
Structure Interaction ◽  
Favorable Change ◽  
Constant Viscosity ◽  
Blood Density ◽  
Velocity Pressure

The main purpose of this research is to analyze blood flow in various scenarios such as 20%, 50% and 80% blockage in blood vessel due to aortic atherosclerosis. Valuable Information for clinical diagnosis of cardiovascular diseases can be obtained by analyzing the behavior of blood flow and its variations. An idealized numerical model of the human bifurcated aorta is created then simulations of steady blood flow were performed on this model and various parameters have been considered. The model parameters include the blood flow velocity, pressure, wall shear stress (WSS) of vessels, constant blood density and constant viscosity. The data computed from software indicates behavior of blood flow according to changes in physical properties of blood vessel. These results are mostly similar to physiological and pathological results of vessels observed in clinical practice. This study will eventually help to find the Fluid Structure Interaction (FSI) of blood flow and blood vessel which will be bring a favorable change in cardiovascular diseases treatments.

Experimental Study of Automotive Aerodynamics in Headlamp Effect

2011 ◽  
Vol 279 ◽  
pp. 339-344
Author(s):  
Lan Fang Jiang ◽  
Hong Liu ◽  
Ai Qi Li
Keyword(s):  
Numerical Simulation ◽  
Boundary Condition ◽  
Experimental Study ◽  
Reynolds Number ◽  
Wind Tunnel ◽  
Drag Coefficient ◽  
Surface Pressure ◽  
Symmetry Plane ◽  
Automotive Aerodynamics ◽  
Inlet Boundary Condition

The effect of headlamp modeling on automotive aerodynamics was studied by wind tunnel tests. Firstly, the effect of Reynolds number on drag coefficient of automotive scaled down models was studied under different velocity of flow to verify the rationality of selecting scale for scaled down model and setting inlet boundary condition. Secondly, drag coefficient of automotive scaled down models with different headlamp modeling design were measured. Thirdly, the distribution of surface pressure on central symmetry plane and headlamp was measured and analyzed. It also validated the validity of preceding numerical simulation. It is of importance to guide the headlamp modeling design and automotive modeling design.

Influence of Contractive and Dilative Motion of Blood Vessel to Robot

2010 ◽  
Vol 139-141 ◽  
pp. 881-884 ◽  
Author(s):  
Fan Jiang ◽  
Juan Yu ◽  
Yi Jun Wang
Keyword(s):  
Blood Flow ◽  
Flow Field ◽  
Blood Vessel ◽  
Flow Parameter ◽  
Moving Surface ◽  
Inlet Velocity ◽  
Velocity Waveform ◽  
Physical Quantities ◽  
Variation Tendency

. In order to study the influence of contractive and dilative motion of blood vessel to robot, the moving surface is to simulate contractive and dilative motion of blood vessel, the model is used for the turbulent of blood flow. The results show that the blood flow field is impacted by the inlet velocity waveform and motion of blood vessel, the variation amplitude of flow parameter is greater than that of rigid blood vessel, the flow physical quantities change with inlet velocity waveform, and different positon has different variation tendency.

A Study for Flow Characteristics of Liquid Slip Flow in Rectangular Microchannels

2007 ◽  
Author(s):  
Jie Jiang ◽  
Yingli Hao ◽  
Jinli Lu
Keyword(s):  
Numerical Simulation ◽  
Boundary Condition ◽  
Shear Rate ◽  
Water Flow ◽  
Slip Length ◽  
Velocity Slip ◽  
Experimental Results ◽  
Experimental Measurements ◽  
Inlet Velocity ◽  
Friction Factors

Nowadays, there has been great interest in micro- and nano-applications. Understanding the flow and heat transfer in microscale is useful. The primary goal of this investigation is to reveal the flow behavior in microchannels. The deionized water flow in a microchannel was experimentally investigated. The pressure drops were measured under the conditions of different Reynolds numbers. The friction factors were obtained based on the experimental measurements. The friction factors deviate significantly from the conventional theory. A series of numerical simulation was also carried out to explore the mechanism of the deviation in the present paper. The numerical simulation adopting the slip boundary condition shows the numerical results coincide with the experimental results very well. The velocity slip was obtained based on the comparison with the experimental results. By introducing the slip length Ls, the velocity slip of water flow in the microchannel can be characterized. The velocity slip increases with the increase of the inlet velocity and the slip length increases with the increase of the shear rate. The linear Navier boundary condition breaks down when the shear rate reaches a critical value. A correlation between the velocity slip and the inlet velocity based on our experimental measurements and numerical results was obtained.

Numerical simulation of pulsatile blood flow in the human left ventricle

2007 ◽  
Vol 55 (S 1) ◽  
Author(s):  
W Schiller ◽  
K Spiegel ◽  
T Schmid ◽  
H Rudorf ◽  
S Flacke ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Blood Flow ◽  
Left Ventricle ◽  
Pulsatile Blood Flow ◽  
Human Left Ventricle

COMPARISON OF ANTIHYPERTENSIVE EFFECT OF MOXONIDINE VERSUS CLONIDINE IN RENAL FAILURE PATIENTS.

2018 ◽  
Vol 6 (9) ◽  
Author(s):  
DR.MATHEW GEORGE ◽  
DR.LINCY JOSEPH ◽  
MRS.DEEPTHI MATHEW ◽  
ALISHA MARIA SHAJI ◽  
BIJI JOSEPH ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Renal Failure ◽  
Blood Flow ◽  
Blood Vessel ◽  
Blood Vessels ◽  
High Blood Pressure ◽  
Antihypertensive Effect ◽  
The Body ◽  
Ability To Work ◽  
Blood Flows

Blood pressure is the force of blood pushing against blood vessel walls as the heart pumps out blood, and high blood pressure, also called hypertension, is an increase in the amount of force that blood places on blood vessels as it moves through the body. Factors that can increase this force include higher blood volume due to extra fluid in the blood and blood vessels that are narrow, stiff, or clogged(1). High blood pressure can damage blood vessels in the kidneys, reducing their ability to work properly. When the force of blood flow is high, blood vessels stretch so blood flows more easily. Eventually, this stretching scars and weakens blood vessels throughout the body, including those in the kidneys.

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