Home / Examples / Fluid Analysis [Bernoulli] / Example 8: Swirling Flow in the Cylindrical Pipe

Example 8: Swirling Flow in the Cylindrical Pipe

General

• The swirling air flowing in the cylindrical pipe is simulated by the steady-state analysis.
   

• The swirling flows are generated at the inlet of the pipe. The swirling component of the flow is gradually decreasing toward the outlet.
   

• Unless specified in the list below, the default conditions are applied.
  

• Obtain this session's project file. (Right-click and choose 'Save link as')




• Results will vary depending on Femtet version and the PC environment.

Analysis Space

Item	Settings
Analysis Space	3D
Model Unit	mm

 

Analysis Conditions

Item	Tab	Settings
Solver	Solver Selection	Fluid analysis [Bernoulli]
Analysis Type	Fluid Analysis	Steady-state Analysis
Meshing Setup	Mesh	General Mesh Size: 3 [mm]

Model

Creates a cylinder with body. As the boundary conditions, velocity vector and angular velocity are set to the bottom face and natural outflow to the top face.

 

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
0/Solid	Air	000_Air *

* Available from the material DB

Boundary Condition

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Setting
Inlet/Face	Fluid	Inlet	Specify flow velocity Direction/Distribution Input (Specify cylindrical coordinates) Axial (inflow) Direction: 100 [mm/s] Angular Velocity: 360 [deg/ s]
Outlet/Face	Fluid	Outlet	Natural Outflow

 

Results

As indicated by the velocity vectors and the streamlines,

the swirling component of the flow velocity are gradually decreasing toward the outlet.

 

 

Fig. 1: Flow Velocity of the Swirling Flows (left: vector diagram, right: streamlines)