Non-Newtonian Fluid Flow Between Two Eccentric Cylinders, ANSYS Fluent

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In this project, the two-phase flow of a non-Newtonian fluid consisting of materials of Drilling and CMC between two eccentric cylinders has been simulated by ANSYS Fluent software.

This ANSYS Fluent project includes CFD simulation files and a training movie.

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Non-Newtonian Fluid introduction

A non-Newtonian fluid is a fluid that does not follow Newton’s law of viscosity, i.e., constant viscosity independent of stress. In non-Newtonian fluids, viscosity can change when under force to either more liquid or more solid. Ketchup, for example, becomes runnier when shaken and is thus a non-Newtonian fluid. Many salt solutions and molten polymers are non-Newtonian fluids, as are many commonly found substances such as custard, honey, toothpaste, starch suspensions, corn starch, paint, blood, melted butter, and shampoo.

Project Description

In this project, the two-phase flow of a non-Newtonian fluid consisting of materials of Drilling and CMC between two eccentric cylinders has been simulated by ANSYS Fluent software. The standard k-omega model is used for flow analysis and low-Re correction is also activated to better capture the flow patterns. The Eulerian multiphase model for two phases of Drilling and CMC has been used to investigate the phase interactions of the non-Newtonian fluid. The mixture of this two-fluid will enter the space between the eccentric cylinders with the velocity of 0.25m/s and the inner cylinder will start to rotate.

Geometry & Mesh

The geometry of this model consists of two eccentric cylinders and is designed and meshed in Gambit®. The mesh type used for this geometry is structured and the element number is 179820.

non-newtonian fluid non-newtonian fluid

CFD Simulation Settings

The key assumptions considered in this project are:

  • Simulation is done using pressure-based solver.
  • The present simulation and its results are steady.
  • The effect of gravity has been taken into account and is equal to 4.905 in X direction and -8.5 in Z direction.

The applied settings are summarized in the following table.

Viscous model k-omega
Model standard
k-omega option Low-Re correction
Multi phase Eulerian
Phase 1 CMC
Phase 2 Drilling
CMC Density 1271.477 Kg/m3
Viscosity Power law
Drilling Density 2000 Kg/m3
Viscosity 0.00111 Kg/m.s
Boundary conditions
Inlet Velocity inlet
Velocity magnitude 0.25 m/s
Drilling volume fraction 0.13
Outlets Pressure outlet
Gauge pressure 0 Pa
inner wall Wall motion Moving wall
wall Speed (rotational) 100 rpm
Outer wall Wall motion stationary wall
Solution Methods
Pressure-velocity coupling Phase coupled Simple
Spatial discretization pressure PRESTO!
Volume fraction First order upwind
momentum first order upwind
Turbulent kinetic energy First order upwind
specific Dissipation rate First order upwind
Initialization method   Standard
Gauge pressure 0 Pa
CMC velocity (x,y,z) (0,0,0.25) m/s
CMC Turbulent kinetic energy 9.375002e-06 m2/s2
CMC specific Dissipation rate 0.1996489
Drilling velocity (x,y,z) (0,0,0.25) m/s
Drilling volume fraction 0.13
Drilling granular temp. 0.0001 m2/s2

Non-Newtonian Fluid Flow Results

The 3D and 2D contours of pressure, velocity, streamlines, etc. are presented.

All files, including Geometry, Mesh, Case & Data, are available in Simulation File. By the way, Training File presents how to solve the problem and extract all desired results.


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