Nonlinear solver

how to solve when appear the error: "Nonlinear solver: failed to converge, residual norm too large."

Answer 1

[Guy Rouleau]

This often happens when your model is too ideal and there is a sudden transition.

In a hydraulic model, this could for example be that you have a flow without restriction and a sudden pressure drop.

In that case, the Simscape solver needs to go through the "transient Initialization" phase:

http://www.mathworks.com/help/toolbox/physmod/simscape/ug/bql2kkl-2.html

and the initial guess he has is too far from the results... consequently it fails to converge.

So I would try to add more realist conditions to your model... depending on the domain, it can mean many different things.

If this does not work, I recommend contacting support with your model.

[Angelo Yeo]

Now, the URL that Guy has provided does not exist. Instead. one can go to the URL below to see what "transient initialization" is:

https://www.mathworks.com/help/physmod/simscape/ug/how-simscape-simulation-works.html?searchHighlight=bql2kkl-2.html&s_tid=srchtitle_bql2kkl-2.html_1#bqoxlpd-1