Isothermal liquid reservoir at constant or time-varying pressure
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The Reservoir (IL) block represents an infinite reservoir of isothermal liquid. Use this block to set the boundary condition in an isothermal liquid network. The liquid in the reservoir can be at a constant pressure, either atmospheric or specified by a block parameter. You can also control the pressure inside the reservoir by using the physical signal input port P. Port A, an isothermal liquid conserving port, represents the reservoir inlet.
The block icon changes depending on the values of the Reservoir type and Reservoir pressure specification parameters.
|Reservoir Type||Reservoir Pressure Specification||Block Icon|
Assumptions and Limitations
The volume of liquid inside the reservoir is assumed infinite. Therefore, the flow is assumed quasi-steady.
There is no flow resistance between port A and the reservoir interior.
P — Pressure control signal, Pa
Physical signal port that provides the reservoir pressure control signal. The signal saturates when its value drops below the minimum valid pressure specified by the Isothermal Liquid Properties (IL) block connected to the circuit.
This port is visible only if you set the Reservoir type
A — Reservoir inlet
Isothermal liquid conserving port associated with the reservoir inlet.
Reservoir type — Specify whether reservoir pressure can change during simulation
Constant (default) |
Select whether the reservoir pressure can change during simulation:
Constant— The reservoir pressure remains constant during simulation. Port P is hidden.
Controlled— The input physical signal at port P specifies the reservoir pressure, which can vary during simulation.
Reservoir pressure specification — Specification method for reservoir pressure
Atmospheric pressure (default) |
Specification method for the reservoir pressure:
Atmospheric pressure— Use the atmospheric pressure specified by the Isothermal Liquid Properties (IL) block connected to the circuit.
Specified pressure— Specify a value by using the Reservoir pressure parameter.
Enabled when the Reservoir type parameter is set to
Reservoir pressure — Pressure in reservoir
0.101325 MPa (default) | positive scalar
Desired pressure in the reservoir. This pressure remains constant during simulation. The specified pressure cannot be greater than the atmospheric pressure specified by the Isothermal Liquid Properties (IL) block connected to the circuit.
Enabled when the Reservoir pressure specification parameter
is set to
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Introduced in R2020a