Symmetries of boundary layer equations of power-law fluids of second grade
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2008
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Abstract
A modified power-law fluid of second grade is considered. The model is a combination of power-law and second grade fluid in which the fluid may exhibit normal stresses, shear thinning or shear thickening behaviors. The equations of motion are derived for two dimensional incompressible flows, and from which the boundary layer equations are derived. Symmetries of the boundary layer equations are found by using Lie group theory, and then group classification with respect to power-law index is performed. By using one of the symmetries, namely the scaling symmetry, the partial differential system is transformed into an ordinary differential system, which is numerically integrated under the classical boundary layer conditions. Effects of power-law index and second grade coefficient on the boundary layers are shown and solutions are contrasted with the usual second grade fluid solutions. © 2008 The Chinese Society of Theoretical and Applied Mechanics and Springer-Verlag GmbH.
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Aerodynamics , Algebra , Boundary layers , Drag reduction , Equations of motion , Fluids , Incompressible flow , Meteorology , Theorem proving , Wall flow , Fluid solutions , Group classifications , Lie Groups , Liegroup theory , Normal stresses , Ordinary differential systems , Partial differentials , Power-law fluid of second grade , Scaling symmetries , Shear thickenings , Hydrodynamics