Viscoelastic stagnation flows: regularity, instability, bifurcations

Name: Viscoelastic stagnation flows: regularity, instability, bifurcations
Brand: LAP Lambert Academic Publishing
SKU: 9786202003278
Price: 135.06 PLN
Availability: InStock

Autor: Igor Mackarov

Język:

Oprawa: Miękka

Wydawca: LAP Lambert Academic Publishing

Dostępność: Dostępna u dostawcy

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135.06 zł

Flows of viscoelastic fluids containing stagnation points are an interesting subject in both applied...

Informacje o książce

Autor

Igor Mackarov

Język

Angielski

Oprawa

Książka - Miękka

Data wydania

2017

strony

EAN

9786202003278

ISBN

6202003278

Enbook ID

18037968

Wydawca

LAP Lambert Academic Publishing

Waga

142

Wymiary

150 x 220 x 5

Pełny opis

Flows of viscoelastic fluids containing stagnation points are an interesting subject in both applied and research aspects. Significant strains arising in the vicinity of such points give ground to a number of specific and complex features. Some of them, purely elastic instabilities, flow asymmetries, bifurcations, reversals, have made an impact on the present work. These non-linear phenomena pose challenges in simulation. One of them is oftentimes observed divergence of numerical solutions for benchmark stagnation flows (near the stationary points) simulated by the upper convective Maxwell (UCM) rheological state equation. It has made some authors find such singularities "invincible" and following from the nature of the UCM model itself. The present work argues this position by presenting asymptotic and numerical solutions for two benchmark types of stagnation UCM flows. In many cases both flows turn out regular in their stagnation points including the case of high Weissenberg numbers. Good agreement is demonstrated between the analytical and numerical results. An explanation is proposed of flow asymmetries onset in terms of the vorticity accumulation at the stagnation point.

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Viscoelastic stagnation flows: regularity, instability, bifurcations

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