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MapleSim Hydraulics Library from Modelon

Sim Ori  Simple orifice model for turbulent flow with volumes at the ports

The Sim Ori component describes the turbulent flow through an orifice if no cavitation occurs using a simple textbook model. The pressure drop is modeled as in Sim Ori No States. Volumes may be added at the ports. Use the modifier(s)

VolumeA(port_A(p(start=1e5,fixed=true)))

and/or

VolumeB(port_A(p(start=1e5,fixed=true)))

to set the initial condition(s) for the pressure of the lumped volume(s) [Pa].

Note: This model can cause severe numerical problems for the integration routine if the pressure drop dp becomes very small.

Related Components

Name

Description

Lam Res

Resistance with laminar flow and volumes at the ports.

Orifice

Recommended component. The component, based on the loss coefficient K, describes both flow regimes: laminar for very small Reynolds numbers and turbulent for higher Reynolds numbers (default model).

Ori Poly

The component describes both flow regimes, using an interpolation polynomial.

Ori Cav

Orifice component checking for cavitation.

Metering Ori

Metering Orifice (that is, component Orifice No States with variable diameter).

Two Orifices

Two orifices in series, one with variable the other with fixed flow area.

Restrictions[Basic]

Differences between basic models are shown by a figure.

Connections

Name

Description

Modelica ID

portA

Layout of port where oil flows into an element (0<mflow, pB<pA means 0<&Delta;p)

port_A

portB

Hydraulic port where oil leaves the component (mflow<0, pB<pA means 0<&Delta;p)

port_B

oil

 

oil

Parameters

Name

Default

Units

Description

Modelica ID

&Delta;Tsystem

0

K

Temperature offset from system temperature

dT_system

use volume A

true

 

If true, a volume is present at port_A

useVolumeA

use volume B

true

 

If true, a volume is present at port_B

useVolumeB

VA

10-6

m3

Geometric volume at port A

volumeA

VB

10-6

m3

Geometric volume at port B

volumeB

d

0.001

m

Orifice diameter

diameter

Cd

0.707

 

Discharge coefficient

C_d

See Also

Metering Ori, Ori Cav, Ori Poly, Orifice, Orifice No States, Restrictions, Restrictions[Basic], Sim Ori No States, Two Orifices, MapleSim Hydraulics Library from Modelon Overview


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