Example6 Flow Path with Multiple Inlets and Outlets

General

A flow path with multiple inlets and outlets is solved.
Forced inflow and forced outflow are set one each.
Natural inflow/outflow is set to the three areas where it is not known if the flow is incoming or outgoing.
Unless specified in the list below, the default conditions are applied.

Analysis Space

Item	Setting
Analysis Space	3D
Model Unit	mm

Analysis Conditions

Item	Tab	Setting
Solver	Solver selection	Fluid analysis [Bernoulli]
Analysis Type	Fluid analysis	Steady-state analysis
Meshing Setup	Mesh	General mesh size: 5[mm]

Model

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
6/Solid	Path	100_Water *

* Available from the material DB

Boundary Condition

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Setting
in_1/Face	Fluid	Inlet	Forced inflow Specify flow velocity: 0.1[m/s]
out_1/Face	Fluid	Outlet	Forced outflow Specify pressure: -1[Pa]
inout_1/Face	Fluid	Inlet/Outlet	Natural Inflow/Outflow
inout_2/Face	Fluid	Inlet/Outlet	Natural Inflow/Outflow
inout_3/Face	Fluid	Inlet/Outlet	Natural Inflow/Outflow

Results

The vectors of the flow velocity are shown below.

The vectors are adjusted to the same length in the graphics setup.

For the three areas where it was not know if they were inflow or outflow before the analysis,
the result shows that inout_1 is inflow, inout_2 and inout_3 are outflow.

The table of the volumetric flow rate is shown as follows.

The inflow rate is shown in the positive value and the outflow rate in the negative values.

For the inflow rate, inout_1 and in_1 are added totaling 4.11e-5[m3/s].
For the outflow rate, inout_2, inout_3, and out_1 are added totaling 4.15e-5[m3/2].
The inflow face and the outflow rate are almost balanced.

See other Fluid Analysis examples.