نتایج جستجو برای: fene modification
تعداد نتایج: 127540 فیلتر نتایج به سال:
We develop a numerical scheme for the flow of viscoelastic fluids, including OldroydB and FENE-CR constitutive models. The space discretization is staggered, using either Marker-And-Cell (MAC) structured nonuniform grids, or Rannacher Turek (RT) nonconforming low-order finite element approximation general quandrangular hexahedral meshes. time uses fractional-step algorithm where solution Navier...
The turbulence of a realistic dilute solution DNA macromolecules is investigated through hybrid Eulerian–Lagrangian approach that directly solves the incompressible Navier–Stokes equation alongside evolution 108 polymers, modelled as finitely extensible nonlinear elastic (FENE) dumbbells. At friction Reynolds number 320 and Weissenberg 2×104, drag reduction equal to 26%, which similar one obtai...
MEDIAWATCH: Rejection of scientific advice by the writers of a BBC thriller based on the consequences of genetic modification of wheat with an antibiotic-resistance gene renders the plot absurd, writes Bernard Dixon.
Reduction in surface shear stress in turbulent boundary layers implies suppression of turbulent momentum flux, a large-eddy phenomenon. The physics by which dilute concentrations of long-chain molecules alter large-eddy structure and momentum flux is not well understood. Experiment, however, indicates an essential mix of turbulent velocity fluctuations, polymer molecules, and mean shear. We stu...
The FENE-P model of a fluid is particularly suitable for describing the rheology of dilute polymer solutions (Newtonian solvents containing small amounts of dissolved polymer) as a result of its ability to capture nonlinear effects arising from the finite extensibility of the polymer chains. In extensional flows, these polymer solutions exhibit dramatically different behavior from the correspon...
OBJECTIVE The present paper describes a model for public health nutrition practice designed to facilitate practice improvement and provide a step-wise approach to assist with workforce development. DESIGN The bi-cycle model for public health nutrition practice has been developed based on existing cyclical models for intervention management but modified to integrate discrete capacity-building ...
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