# Numerical solution of the Giesekus model for incompressible free surface flows without solvent viscosity

M.F. Tomé, M.T. Araujo, J.D. Evans, S. McKee

Research output: Contribution to journalArticle

1 Citation (Scopus)

### Abstract

We present a numerical method for solving the Giesekus model without solvent viscosity. This paper is concerned with incompressible two-dimensional free surface flows and employs the finite difference method to solve the governing equations. The methodology involves solving the momentum equation using the implicit Euler scheme and an implicit technique for computing the pressure condition on the free surface. The nonlinear Giesekus constitutive equation is computed by a second order Runge–Kutta method. A novel analytic solution for channel flow is developed and is used to verify the numerical technique presented herein. Mesh refinement studies establish the convergence of the method for complex free surface flows. To demonstrate that the technique can deal with complicated free surface flows, the time-dependent flow produced by a fluid jet flowing onto a rigid surface is simulated and the influence of the parameter α on the jet buckling phenomenon is investigated. In addition, the simulation of the extrudate swell of a Giesekus fluid was carried out and the effect of the parameter α on the flow was similarly examined.

Language English 104-119 16 Journal of Non-Newtonian Fluid Mechanics 263 22 Nov 2018 10.1016/j.jnnfm.2018.11.007 Published - 31 Jan 2019

### Fingerprint

Incompressible Surface
Free Surface Flow
Incompressible Flow
Viscosity
Numerical Solution
viscosity
Fluid
Euler Scheme
Channel Flow
Mesh Refinement
Implicit Scheme
Constitutive Equation
Runge-Kutta Methods
Numerical Techniques
Buckling
Analytic Solution
Free Surface
Difference Method
Governing equation
fluid jets

### Keywords

• analytical solution
• extrudate swell
• finite difference
• free surface flow
• Giesekus model
• jet buckling

### Cite this

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title = "Numerical solution of the Giesekus model for incompressible free surface flows without solvent viscosity",
abstract = "We present a numerical method for solving the Giesekus model without solvent viscosity. This paper is concerned with incompressible two-dimensional free surface flows and employs the finite difference method to solve the governing equations. The methodology involves solving the momentum equation using the implicit Euler scheme and an implicit technique for computing the pressure condition on the free surface. The nonlinear Giesekus constitutive equation is computed by a second order Runge–Kutta method. A novel analytic solution for channel flow is developed and is used to verify the numerical technique presented herein. Mesh refinement studies establish the convergence of the method for complex free surface flows. To demonstrate that the technique can deal with complicated free surface flows, the time-dependent flow produced by a fluid jet flowing onto a rigid surface is simulated and the influence of the parameter α on the jet buckling phenomenon is investigated. In addition, the simulation of the extrudate swell of a Giesekus fluid was carried out and the effect of the parameter α on the flow was similarly examined.",
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Numerical solution of the Giesekus model for incompressible free surface flows without solvent viscosity. / Tomé, M.F.; Araujo, M.T.; Evans, J.D.; McKee, S.

In: Journal of Non-Newtonian Fluid Mechanics, Vol. 263, 31.01.2019, p. 104-119.

Research output: Contribution to journalArticle

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T1 - Numerical solution of the Giesekus model for incompressible free surface flows without solvent viscosity

AU - Tomé, M.F.

AU - Araujo, M.T.

AU - Evans, J.D.

AU - McKee, S.

PY - 2019/1/31

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N2 - We present a numerical method for solving the Giesekus model without solvent viscosity. This paper is concerned with incompressible two-dimensional free surface flows and employs the finite difference method to solve the governing equations. The methodology involves solving the momentum equation using the implicit Euler scheme and an implicit technique for computing the pressure condition on the free surface. The nonlinear Giesekus constitutive equation is computed by a second order Runge–Kutta method. A novel analytic solution for channel flow is developed and is used to verify the numerical technique presented herein. Mesh refinement studies establish the convergence of the method for complex free surface flows. To demonstrate that the technique can deal with complicated free surface flows, the time-dependent flow produced by a fluid jet flowing onto a rigid surface is simulated and the influence of the parameter α on the jet buckling phenomenon is investigated. In addition, the simulation of the extrudate swell of a Giesekus fluid was carried out and the effect of the parameter α on the flow was similarly examined.

AB - We present a numerical method for solving the Giesekus model without solvent viscosity. This paper is concerned with incompressible two-dimensional free surface flows and employs the finite difference method to solve the governing equations. The methodology involves solving the momentum equation using the implicit Euler scheme and an implicit technique for computing the pressure condition on the free surface. The nonlinear Giesekus constitutive equation is computed by a second order Runge–Kutta method. A novel analytic solution for channel flow is developed and is used to verify the numerical technique presented herein. Mesh refinement studies establish the convergence of the method for complex free surface flows. To demonstrate that the technique can deal with complicated free surface flows, the time-dependent flow produced by a fluid jet flowing onto a rigid surface is simulated and the influence of the parameter α on the jet buckling phenomenon is investigated. In addition, the simulation of the extrudate swell of a Giesekus fluid was carried out and the effect of the parameter α on the flow was similarly examined.

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