# What's the difference between residual and cauchy in convergence criteria

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 September 7, 2015, 09:43 What's the difference between residual and cauchy in convergence criteria #1 New Member   Jason Shih Join Date: Jan 2015 Location: Xi'an China Posts: 26 Rep Power: 10 Hi, I'm using SU2_v3.2.7 for shape optimization, but I'm a little confuse about the option RESIDUAL and CAUCHY in convergence criteria. Can anybody explain the difference between these options for me? Thanks in advance! Jason Shih

 September 15, 2015, 17:06 #2 New Member   Andrw Wendorff Join Date: Apr 2014 Posts: 28 Rep Power: 11 The cauchy convergence looks at one of the coefficients and when the coefficient is steady to a specified decimal place for a certain number of elements (also specified) then the run stops. The residual looks at the density residual and requires that residual to decrease a specified number orders of magnitude. bornax likes this.

 September 24, 2015, 04:40 #3 New Member   Jason Shih Join Date: Jan 2015 Location: Xi'an China Posts: 26 Rep Power: 10 Hi,Andrw Thanks for your reply,that helps. ` Jason Shih

 March 12, 2018, 18:58 #4 New Member   User2018 Join Date: Jan 2018 Posts: 1 Rep Power: 0 hello, what does it mean convergence criteria for the residuals?

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