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Secondary flow Effects in Relatively Narrow Channels

Journal of Thermal Science 2003年第3期12卷 209-213,238页

作者： Rudolf Dvo■ák Institute of Thermomechanics Academy of Sciences of the Czech Republic 182 00 Prague The Czech Republic

Secondary flow effects were discussed in numerous papers at the past ISAIF Symposia, mainly in connection with turbine or compressor cascades. This paper will complement these papers by looking at the problem from the channel (or blade passages) geometry point of view. If we describe as secondary flows any flows in planes perpendicular to the main flow direction, then there are at least three kinds of secondary flows in a typical turbine rotor cascade:-secondary flows of the 1st kind, generated by centrifugal forces in closed curved channels,-secondary flows of the 2nd kind, generated by interacting boundary layers, mainly in corners (this will include even the horseshoe vortices),-secondary flows due to mass inflow through the tip clearance.Quite often all the secondary flow vortices merge downstream into a passage vortex with a non-negligible contribution to the channel (cascade) losses, and it is worth investigating the individual contributions to these losses to take them into account in the design procedure.

关键词： channel flows secondary flows flow separation.

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

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International Journal of Biomathematics 2018年第6期11卷 129-150页

作者： Subrata Mukhopadhyay Mani Shankar Mandal Swati Mukhopadhyay Department of MathematicsAcharya P. C. Roy Govt. College Siliguri W.B. India Department of MathematicsG.G.D. C at Kalna-I Purba Bardhaman-713405 W.B. India Department of MathematicsThe University of Burdwan Burdwan-713104 W.B. India

Pulsatile flow of blood in a blood vessel having time-dependent shape （diameter） is inves-tigated 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.

关键词： Pulsatile flow stenosis stream function-vorticity method finite differencete chnique non-Newtonian fluid fluid-structure interaction wall shear stress flow separation.

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