Item description

Simulation of non-Newtonian flow between two non-centered cylinders

In Newtonian fluids, the relationship between shear stress variations and the applied stress rate is linear, and the constant coefficient of converting this linear fit to the equation is the same viscosity or viscosity, but in non-Newtonian fluids, the relationship between stress and strain is no longer linear. In this spectrum of fluids, the duration of application of stress plays an important role in the incisive shear stress. As a result, in non-urea fluids, a constant coefficient such as a viscosity for describing the shear stress state is not meaningful. Non-Newtonian fluids are divided into three groups independent of time-dependent and viscoelastic.

Two non-centered tubes are one of the simplest examples of which one can observe completely different non-neutron fluid behavior. In this analysis, we tried to use a non-Newtonian fluid between two non-centered cylinders.

In this analysis, we tried to simulate and analyze the behavior of a non-Newtonian fluid in the space between two non-centered cylinders using Ansys Fluent software.

Geometry and Mesh

The geometry required to analyze the non-Newtonian flow between two non-centered cylinders includes two non-centered, one-way, one-dimensional, all-in-one geometry of Gambit’s design and mesh required by this software for this geometry. The gridding made for this geometry is unorganized and the total number of cells created for this geometry is 179820 cells.

Model

To analyze nonlinear fluid flow inside these two non-centered loops, the Eulerian multiphase model is used as a 2-phase method. The turbulence viscosity model K-omega Standard has been used to investigate the turbulence of the current. For better flow analysis in this sample, the Low-Re Correction settings are also used.

The materials used in this analysis are also defined in the Material section for this analysis.

Boundary conditions

The flow input for the two-phase Eulerian for this analysis is considered as Velocity Inlet and is 0.25 m / s. The volume fraction percentage for a two-phase current of 0.13 is considered. The flow output range is also considered as a pressure outlet for the flow output region. The inner wall is also considered as a Moving Wall.

Solving method and discrete algorithm

To solve the equations in this analysis, the Phase Coupled Simple algorithm is used to solve coupling speed and pressure equations. Also, a pressure-based solution for flow resolution is used. The First Order Upwind method is used to discriminate equations.

In the end, the results are shown as cantors of velocity, pressure, and flow lines.

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