Pulsatile flow of non-newtonian fluids through arterial stenoses
Pulsatile flow of non-newtonian fluids through arterial stenoses
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DOI：
10.1016/0021-9290(95)00151-4
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发表时间：
1996-07-01
影响因子：
2.4
通讯作者：
Deville, M
中科院分区：
文献类型：
--
作者：
Tu, C;Deville, M
用不可压缩广义牛顿模型解决了血管狭窄的血流问题。Herschel-Bulkley， Bingham和幂律流体被合并。几何形状对应于一个部分遮挡的刚性圆管。采用Galerkin有限元法进行了计算。对于脉冲情况，采用预测校正时间推进方案，并采用自适应时间步长。得到了稳定和脉动生理流的结果。计算表明，与牛顿参考情况相比，模型中考虑的记忆效应对流动的影响更大。涡旋强度对扰动的影响更大，并在几何障碍后持续存在。对于严重的狭窄尤其如此。版权所有爱思唯尔科学有限公司
The problem of blood flow through stenoses is solved using the incompressible generalized Newtonian model. The Herschel-Bulkley, Bingham and power-law fluids are incorporated. The geometry corresponds to a rigid circular tube with a partial occlusion. Calculations are performed by a Galerkin finite-element method. For the pulsatile case, a predictor-corrector time marching scheme is used with an adaptive time step. Results are obtained for steady and pulsatile physiological flows. Computations show that the memory effects taken into account in the model affect deeply the flow compared with the Newtonian reference case. The disturbances are stronger by their vorticity intensity and persist after the geometrical obstacle. This is especially true for severe stenoses. Copyright (C) 1996 Elsevier Science Ltd.