# Concentric Cylinders-Couette Flow

Couette flow between two circular cylinders is used to investigate the behaviour of velocity boundary condition for complex geometries with q-values. In this flow, the inner cylinder with radius $r_1=0.25/2 m$ rotates with a constant angular velocity $\omega=0.213 rad/s$ and the outer cylinder with radius $r_2=0.5 m$ is kept stationary.

This Couette flow has the following analytical solution where $u_0=\omega r_1$ and $\beta=r_1/r_2$.

The mesh created here is single level with 32 elements in inner cylinder diameter.

In these test cases, in addition to the aforementioned features, you will also learn how to:

• Create a mesh with boundaries with q-values using Seeder.
• Post-processing nd visualization in Paraview.
• Create a 2D plot using Gleaner tool. Gleaner is a Python tool which extracts data from Musubi ascii output and uses matplotlib in python library to create a plot.