Simulation of Thrombus Formation Process Using Lattice Boltzmann Method With Consideration of Adhesion Force to Wall

2010 ◽  
Author(s):  
Masaaki Tamagawa
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Adhesion Force ◽  
Thrombus Formation ◽  
Artificial Organs ◽  
Physical Parameters ◽  
Physical Factors ◽  
Blood Pumps ◽  
Boltzmann Method ◽  
Rotary Blood Pumps

Recently artificial organs, especially rotary blood pumps, have been developed in the worldwide, but in this development, thrombus occurs in the pumps. In general, the main physical factors of thrombus formation are considered to be shear rate, wall properties for blood’s adhesion. But, there are no proper CFD codes for predicting thrombus formations using physical parameters in shear flows. In this paper, new model for predicting thrombus formation by considering aggregation and adhesion force to the wall by lattice Boltzmann method is proposed, and the trend of thrombus’s adhesion to the wall can be simulated more adequately than that of previous one.

CFD Study of Thrombus Formation on Shear Blood Flows by Using Modified Lattice Boltzmann Method and Thrombus Observation

2008 ◽  
Author(s):  
Masaaki Tamagawa
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Shear Flows ◽  
Thrombus Formation ◽  
Prediction Method ◽  
Rotary Blood Pump ◽  
Blood Flows ◽  
Orifice Flow ◽  
Computational Fluid Dynamics Cfd ◽  
Boltzmann Method

This paper describes development of the prediction method of thrombus formation by Computational Fluid Dynamics (CFD) on pipe orifice shear flows. These shear flows are typical models of the flow in the rotary blood pump. In this investigation, the thrombus formation in blood plasma flow is visualized, and modified lattice Boltzmann method are used to predict the backward forwarding step flow, that is simple model of the orifice flow.

Very-Large Eddy Simulations of Disk Heat Transfer in a Rotating Cavity Using Lattice-Boltzmann Method

2018 ◽  
Author(s):  
J. Kouwa ◽  
Y. Iso ◽  
F. Polidoro ◽  
S. Gautier
Keyword(s):  
Heat Transfer ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Three Dimensional ◽  
Flow Structures ◽  
Physical Parameters ◽  
Transfer Coefficients ◽  
Experimental Heat ◽  
Large Eddy ◽  
Boltzmann Method

Convective heat transfer in the cavity between two corotating disks is of great importance for turbomachinery applications. The complex three dimensional and unsteady flow structures induced by the Coriolis forces inside the cavity, and therefore the resulting heat transfer, are challenging to be measured in an experiment or predicted by simulation. In this paper a simplified cavity geometry, characterized experimentally by Long at al., has been chosen. The results obtained with a Very Large Eddy Simulation using Lattice-Boltzmann Method for two operating point with different rotation speeds are compared to the experimental heat transfer coefficients at the wall. The simulation results show the characteristic flow structures and behavior induced by the different regimes. A sensitivity analysis of the results is presented, both for numerical parameters such as grid resolution and for physical parameters, namely the throughflow velocity profile and shroud temperature.

Simulation on Short-Gap Streamer Discharge in Gases Using the Lattice Boltzmann Method

2017 ◽  
Vol 14 (1) ◽  
pp. 505-510
Author(s):  
Nan Wang ◽  
Qingquan Lei ◽  
Xuan Wang
Keyword(s):  
Numerical Simulation ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Numerical Solutions ◽  
Transport Equations ◽  
Physical Parameters ◽  
Streamer Discharge ◽  
Microscopic Mechanism ◽  
Discharge Simulation ◽  
Boltzmann Method

Streamer discharge is an important aspect of gap discharge in gases, but experimental method alone cannot delineate the microscopic mechanism of streamer discharge and all physical parameters of the discharge channel. Numerical simulation provides an important method for theoretical study of streamer discharge. To solve the particle transport equations in streamer discharge simulation, we applied the lattice Boltzmann method to the design of a solution model which requires a smaller calculation load. Furthermore, we provided the 1.5-dimensional streamer discharge simulation model based on the D1Q3 model as well as the numerical solutions to electron transport and positive ion transport equations. Using this model, numerical simulation was performed on two types of streamer development processes in N2 gas between the plate electrodes under atmospheric pressure. The simulation results were then compared against the results in the previous reports, and the feasibility of using the lattice Boltzmann method for streamer discharge simulation was demonstrated.

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