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Cap (TL)

Perfectly insulated stop to fluid flow

  • Library:
  • Simscape / Foundation Library / Thermal Liquid / Elements

  • Cap (TL) block


The Cap (TL) block represents a terminus to a thermal liquid branch. The stop is perfectly insulated, preventing heat transfer with its surroundings.

You can use this block to terminate thermal liquid ports on other blocks that you want to cap. This is not necessary because if you leave a conserving port unconnected, the physical network sets all the Through variables at that port to 0. However, terminator blocks improve diagram readability.

You can also use this block to set the initial pressure and temperature at a node.


To set the priority and initial target values for the block variables prior to simulation, use the Variables tab in the block dialog box (or the Variables section in the block Property Inspector). For more information, see Set Priority and Initial Target for Block Variables and Initial Conditions for Blocks with Finite Gas Volume.



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Thermal liquid conserving port where the mass flow rate and energy flow rate are both equal to zero.

Compatibility Considerations

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Behavior changed in R2019b

Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Introduced in R2013b