How can I solve the error generated by a T-Junction when there is a Parallel Channels block in my simscape fluid model?

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Miguel 2023-6-29

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https://ww2.mathworks.cn/matlabcentral/answers/1989703-how-can-i-solve-the-error-generated-by-a-t-junction-when-there-is-a-parallel-channels-block-in-my-si

评论： Miguel 2023-7-10

When I try to simulate this model, there is no problem:

But when I add a T-Junction block, it generates this error:

In the last picture you can see settings from T-Junction and Parallel Channels blocks. Areas and Diameters are all the same in the model.

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Yifeng Tang 2023-6-30

The warning message suggests conflicting high-priority initial conditions. That may lead to unexpected initial conditions as Simscape TRIES to satify most of the specified initial conditions. You may use the variable viewer to see what exact values to which the model initialized to.

If you can share the model, it'll make it easier for the community to help diagnose.

Miguel 2023-7-3

Example.slx

This is the model that I use.

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Answer 1

Yifeng Tang 2023-7-7

Hi Miguel,

In the model you shared, the T-junction has the default initial flow target of 0 at all ports and "high" priority. This is in conflict with the mass flow rate source you connected to the A port, and the simulation failed to find a consistent set of initial conditions to start.

The solution is simple though. Make the priority "None" for these flows, so at t=0 the solver won't try to make the flow at each port zero. Instead they'll be determined by the ICs from other blocks, in this case the flow rate source. See below.