Simscape Reference

Constant Area Hydraulic Orifice
• “Variables Tab” on page 1-31
Parameters Tab
Orifice area
Orifice passage area. The default value is 1e-4 m^2.
Flow discharge coefficient
Semi-empirical parameter for orifice capacity characterization. Its value depends
on the geometrical properties of the orifice, and usually is provided in textbooks or
manufacturer data sheets. The default value is 0.7.
Critical Reynolds number
The maximum Reynolds number for laminar flow. The transition from laminar to
turbulent regime is assumed to take place when the Reynolds number reaches this
value. The value of the parameter depends on the orifice geometrical profile. You can
find recommendations on the parameter value in hydraulics textbooks. The default
value is 12, which corresponds to a round orifice in thin material with sharp edges.
Variables Tab
Use the Variables tab to set the priority and initial target values for the block variables
prior to simulation. For more information, see “Set Priority and Initial Target for Block
Variables”.
Global Parameters
Parameters determined by the type of working fluid:
• Fluid density
• Fluid kinematic viscosity
Use the Hydraulic Fluid block or the Custom Hydraulic Fluid block to specify the
fluid properties.
Ports
The block has the following ports:
1-31