Computation of unsteady viscous incompressible flows in generalized non-inertial co-ordinate system using Godunov-projection method and overlapping meshes

2002 ◽  
Vol 40 (11) ◽  
pp. 1365-1380
Author(s):  
H. Pan ◽  
M. Damodaran
Keyword(s):  
Projection Method ◽  
Incompressible Flows ◽  
Viscous Incompressible Flows

scholarly journals Stability of Two-Dimensional Viscous Incompressible Flows under Three-Dimensional Perturbations and Inviscid Symmetry Breaking

2013 ◽  
Vol 45 (3) ◽  
pp. 1871-1885 ◽  
Author(s):  
C. Bardos ◽  
M. C. Lopes Filho ◽  
Dongjuan Niu ◽  
H. J. Nussenzveig Lopes ◽  
E. S. Titi
Keyword(s):  
Symmetry Breaking ◽  
Incompressible Flows ◽  
Three Dimensional ◽  
Two Dimensional ◽  
Viscous Incompressible Flows

Microscale Flow Pumping Inspired by Rhythmic Tracheal Compressions in Insects

2011 ◽  
Author(s):  
Yasser Aboelkassem ◽  
Anne E. Staples ◽  
John J. Socha
Keyword(s):  
Tracheal Tube ◽  
Incompressible Flows ◽  
Time Lag ◽  
Viscous Effects ◽  
Single Cycle ◽  
Single Model ◽  
Microscale Flow ◽  
Valveless Pumping ◽  
Viscous Incompressible Flows ◽  
Rhythmic Contractions

Inspired by the physiological network of insects, which have dimensions on the order of micrometers to millimeters, we study the airflow within a single model insect tracheal tube. The tube undergoes localized rhythmic wall contractions. A theoretical analysis is given to model the airflow within the tracheal tube. Since flow motions at the microscale are dominated mainly by viscous effects, and the tube has radius, R, that is much smaller than its length, L, (i.e. δ = R/L ≪ 1), lubrication theory for axisymmetric, viscous, incompressible flows at low Reynolds number (Re ∼ δ) is used to model the problem mathematically. Expressions for the velocity field, pressure gradient, wall shear stress and net flow produced by the driving tube wall contractions are derived. The effect of the contraction amplitudes, time lag, and spacing between two sequences of contractions on the time-averaged net flow over a single cycle of wall motions is investigated. The study presents a new, insect-inspired mechanism for valveless pumping that can guide efforts to fabricate novel microfluidic devices that mimic these physiological systems. A x-ray image that shows the tracheal network of the respiratory system of an insect (Carabid beetle) and the associated locations of these rhythmic contractions are shown in figure (1) to promote this study.

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