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ill-conditioned stiffness matrix
Posted 10.12.2013, 15:47 GMT-5 Version 3.5a, Version 4.1, Version 4.2, Version 4.2a, Version 4.3, Version 4.3a, Version 4.3b, Version 4.4 1 Reply
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I am trying to extract model matrixes using COMSOL and designing my own nonlinear dynamic solver in Matlab. However, I have convergence issues.
Then I check the condition number of stiffness matrix Ke using matlab command condest(), it returns values between 1e12 to 1e14.
du = Ke\Le, an ill-conditioned Ke will weaken the accuracy of du. Does COMSOL/matlab handle matrix inversion accurately when its condition number is above 1e12? Are there any methods to tackle this issue?
Thanks a lot
Hello Zhangxian Deng
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