Hemodynamical Flows: Modeling, Analysis and Simulation by Giovanni P. Galdi PDF

By Giovanni P. Galdi

ISBN-10: 3764378050

ISBN-13: 9783764378059

This publication surveys learn effects at the actual and mathematical modeling, in addition to the numerical simulation of complicated fluid and structural mechanical strategies happening within the human blood move method. subject matters taken care of contain continuum mechanical description; collection of compatible liquid and wall types; mathematical research of coupled versions; numerical tools for circulate simulation; parameter id and version calibration; fluid-solid interplay; mathematical research of piping structures; particle delivery in channels and pipes; man made boundary stipulations, and plenty of extra. The ebook was once built from lectures provided through the authors on the Oberwolfach examine Institute (MFO), in Oberwolfach-Walke, Germany, November, 2005.

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Extra resources for Hemodynamical Flows: Modeling, Analysis and Simulation

Sample text

An early rheologist Pryce-Jones noted that thixotropy is more pronounced in systems composed of non-spherical particles [3]. Blood clearly falls in this category. The theoretical formulation for thixotropic materials is far less developed than that for simple fluids. Barnes [3] described three categories of thixotropic models. In the first category, indirect microstructural theories, a scalar parameter is used to describe the level of microstructure. An evolution equation is then introduced to describe the rate of change of this parameter as a result of competing effects driving build-up or breakdown in microstructure.

If these results are plotted on a log scale, the value n can be obtained from the slope of the curve, which will in general be a function of τw . 12) is quite useful for viscometry, it is of interest to include some of the exact solutions for steady, fully developed flows of simple fluids in straight pipes of constant cross section. 7). 14) where μ is the constant fluid viscosity. 15) law viscosity ⎪ ⎪ dp 2K 3 + 1/n n n ⎪ ⎩ = − ( ) Q . dz R π R3 For the same flow rate, the velocity field in the shear thinning power-law model is flatter than for the constant viscosity case, Figure 6.

38), we obtain the familiar requirement that the viscosity be non-negative η ≥ 0. 4. 10), the generalized Newtonian fluids differ through their choice of the viscosity function. 13) where n and K are termed the power-law index and consistency, respectively. The power-law model includes the Newtonian fluid as a special case (n=1), where the viscosity η is then a constant, often denoted by μ. For n < 1, the power-law is shear thinning (decreasing viscosity with shear rate), while for n > 1 it is shear thickening, Figure 3.

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Hemodynamical Flows: Modeling, Analysis and Simulation by Giovanni P. Galdi

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