Difference between using 2 and 3-Port Constant Volume Chamber Simscape Gas Domain Blocks

What is the difference between using the 2-Port Constant Volume Chamber and 3-Port Constant Volume Chamber block with three gas domain signals?

Answer 1

[MathWorks Support Team]

The notable differences between the use of these two blocks are the equations that describe mass balance and energy balance, and the ability to define cross sectional port areas.The 2-Port Constant Volume Chamber (G) block has fewer terms than the 3-Port Constant Volume Chamber (G) block. When using three gas signals, this does not matter two much but just be aware of the differences in equations.Please run the below command in the MATLAB R2018b command window to get the release specific documentation

web(fullfile(docroot, 'physmod/simscape/ref/2portconstantvolumechamberg.html'))

Please run the below command in the MATLAB R2018b command window to get the release specific documentation

web(fullfile(docroot, 'physmod/simscape/ref/3portconstantvolumechamberg.html'))

Please be aware of connecting two gas signals when using the 2-Port Constant Volume Chamber (G) block. This block does not allow you to control the cross sectional port area for each individual gas signal. The replacement of systems with different cross sectional areas with a 2-Port Constant Volume Chamber may cause differences in results. This can affect flow rates.

Please follow the below link to search for the required information regarding the current release:

https://www.mathworks.com/help/