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#1 |
Senior Member
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Join Date: Oct 2021
Location: -
Posts: 139
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Hello everybody~!
I was wondering what is initial residual and final residual. So I've searched these things in CFD Online and Youtube. I've seen video at below link. https://www.youtube.com/watch?v=OOILoJ1zuiw&t=1s And I've found this post SIMPLE: Difference between initial and final residuals At upper link, 'Zbynek' has said that "When your final residual is low enough, you update the matrix and repeat the whole process I just described (called outer iteration). Voila, you get a new initial residual that has naturally a larger value than the previous final residual." I'm wondering two points. 1. Deos 'Ax=b' means Navier-Stokes equation? https://youtu.be/OOILoJ1zuiw?t=281 At this link, ![]() ![]() Is it right? 2. If 'Ax=b' means Navier-Stokes equation, then how A can be updated during outer iteration? What I've guessed is below. At below link, https://youtu.be/OOILoJ1zuiw?t=360 ![]() ![]() And this means ![]() https://youtu.be/OOILoJ1zuiw?t=410 Also ![]() Because H is changed by U and H is component of MU, if U is updated M must be changed. And M is same thing to A in 'Ax=b' Is it right? I'm not sure... Eventhough we've updated only x then substitute it into ![]() how M(same thing to A in 'Ax=b') can be updated? Thank you~! ![]() |
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Tags |
pimple, residual, simple algorithm |
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