Linear run

[jinlu]

Is the linear case supposed to converge at 1 iteration? Why 2 iterations are needed to reach the convergence?
I'm using "test NormDispIncr 1e-04 50 1".

Thanks.
Jinchi

[vesna]

What do you mean by "linear case"?

[jinlu]

Linear run. e.g., a mesh of solid elements where the material is linear elastic isotropic.

[jinlu]

Below is the sample screen output:
CTestNormDispIncr::test() - iteration: 1 current Norm: 0.00022683 (max: 0.0001, Norm deltaR: 20435.1)
CTestNormDispIncr::test() - iteration: 2 current Norm: 4.27053e-007 (max: 0.0001, Norm deltaR: 20435.1)

CTestNormDispIncr::test() - iteration: 1 current Norm: 0.00022683 (max: 0.0001, Norm deltaR: 20448.2)
CTestNormDispIncr::test() - iteration: 2 current Norm: 4.2707e-007 (max: 0.0001, Norm deltaR: 20448.2)

CTestNormDispIncr::test() - iteration: 1 current Norm: 0.00022683 (max: 0.0001, Norm deltaR: 20461.3)
CTestNormDispIncr::test() - iteration: 2 current Norm: 4.2707e-007 (max: 0.0001, Norm deltaR: 20461.3)

CTestNormDispIncr::test() - iteration: 1 current Norm: 0.00022683 (max: 0.0001, Norm deltaR: 20474.4)
CTestNormDispIncr::test() - iteration: 2 current Norm: 4.2707e-007 (max: 0.0001, Norm deltaR: 20474.4)

CTestNormDispIncr::test() - iteration: 1 current Norm: 0.00022683 (max: 0.0001, Norm deltaR: 20487.7)
CTestNormDispIncr::test() - iteration: 2 current Norm: 4.2707e-007 (max: 0.0001, Norm deltaR: 20487.7)

[vesna]

If you use linear algorithm you will get solution in one step, but if you use any other algorithm it may happen that you need more than one step to converge.

[jinlu]

Thank you very much Vesna.