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I created a tunnel that have a quarter wave tube at the middle of the tunnel to simulate the noise reduction. But an error SingularMatrixError occur. How to fix it?

sandhi-b
I have tried to make a finer meshing and make sure all the model and simulation setting are the same. But, when one case study could be successfully simulated, another case study with the same settings couldn't. The error is:
<class 'ValueError'> SingularMatrixError: The system matrix is singular
 
I have attached the simulation log and the screenshot of both successful and failed simulation.
 
Could you help me to address the error and get to know how to fix it?
Thank you very much.
  • 0
    Hello everyone. It has been solved. The problem was I use the same infinite element coordinate for different model. It made a slight mismatch between the model boundary location (which is different for every other model) and the coordinate of the infinite element (I thought it will be the same for all model I have created).
     
    So, I just need to reset the coordinate of my infinite element at the center of my boundary condition of my every model.
     
    Thank you
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