Week 9- Unsteady moving zones Approach

AIM:

• To simulate a generic turbomachinery component using the Moving Mesh method in the transient state at 300 rpm using appropriate time steps to understand the flow physics.
• Generate an animation file for the rotation.

THEORY:

Moving Mesh Approach:

The moving mesh approach is used only for the unsteady phenomenon like,

• Vortex-induced flow.
• Interaction of vortex with bodies.

In Moving Mesh Approach,

• Mesh is moving.
• Topology of mesh changes with time.
• Control volume changes as mesh changes.
• It is an unsteady phenomenon.

PROCEDURE:

setp-1 Import mesh file

step-2 Append different mesh zones

step-3 General Settings

step-4 Viscous Model

step-5 Material Selection

step-6 Cell Zones

step-7 fixed frame

step-8 rotating frame

step-9 surface body

step-10 Boundary conditions

step-11 Airfoil boundary conditions

step-12 inlet B.C.

step-13 Outlet B.C.

step-14 Defining interface

step-15 Reference values

step-16 Solution Method

step-17 Solution Control

step-18 Flux report definition

step-19 MFR Convergence condition

step-20 initialiazation

step-21 Time step calculation and running calculation

For timestep we use the formula,

rotational velocity = 300 rpm

angular velocity = (2 x pi x N) / 60

Time period = 60/ N

T = 0.2

to achieve this time period within 1000 timesteps we use

0.2/ 1000 = 0.0002.

step-27 saving animation

results:

residuals:

Plots:

Mass Flow Rate:

velocity:

pressure:

contour:

Velocity:

Vorticity:

Pressure:

Link to animation:

Velocity Contour Animation:

animation-1.mp4 - Google Drive

Pressure Contour Animation:

animation-2.mp4 - Google Drive