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Relative error is greater than relative tolerance error
Posted 17.07.2014, 14:35 GMT-4 Electromagnetic Heating, Geometry, Mesh, Studies & Solvers, Structural Mechanics Version 4.3, Version 4.3a 1 Reply
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Hello all,
I am new to Comsol and am trying to do a very simple simulation so familiarize myself with the software.
I am using the Joule Heating and Thermal Expansion module in Comsol and my model is a simple beam (rectangular prism) with length 100 um, width 10 um and height 10 um. I simply apply current to one end of the beam and ground the other end and I am attempting to simulate the temperature distribution across the beam. Additionally I have set the two ends where current and ground are to a set temperature of 293 K before solving. The material of the beam is silicon.
I continue to receive this error:
Failed to find a solution.
In segregated group 1:
The relative error (1.1e+002) is greater than the relative tolerance.
Returned solution is not converged.
Whenever I attempt to play with the inputs the only difference in the error is that the relative error value (in this case 1.1e+002) changes to something different.
Any ideas on where this error might arise from?
Any assistance would be greatly appreciated.
Thanks
Ryan D.
I am new to Comsol and am trying to do a very simple simulation so familiarize myself with the software.
I am using the Joule Heating and Thermal Expansion module in Comsol and my model is a simple beam (rectangular prism) with length 100 um, width 10 um and height 10 um. I simply apply current to one end of the beam and ground the other end and I am attempting to simulate the temperature distribution across the beam. Additionally I have set the two ends where current and ground are to a set temperature of 293 K before solving. The material of the beam is silicon.
I continue to receive this error:
Failed to find a solution.
In segregated group 1:
The relative error (1.1e+002) is greater than the relative tolerance.
Returned solution is not converged.
Whenever I attempt to play with the inputs the only difference in the error is that the relative error value (in this case 1.1e+002) changes to something different.
Any ideas on where this error might arise from?
Any assistance would be greatly appreciated.
Thanks
Ryan D.
1 Reply Last Post 17.07.2014, 15:16 GMT-4
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Posted:
1 decade ago
My guess: make sure you're preventing rigid body motions, otherwise the problem does not have a single solution.
Jeff
Jeff