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#1 |
New Member
Abbas Raza
Join Date: Jul 2019
Posts: 1
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Hello all, I'm fairly new to CFD and still trying to get a hang of it. I have performed this simulation and convergence criteria were all set to default. Does this iteration graph show that my solution is converged?
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#2 |
Senior Member
Svetlana Tkachenko
Join Date: Oct 2013
Location: Australia, Sydney
Posts: 415
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Hi raza111
1. Is this the first time you are running a CFD simultion? 2. Your continuity has converged to the value of 1e-1. You do not need to run the simulation any further, this is unlikely to improve convergence. 3.The 1e-1 level may be insufficient. It is often needed to converge to 1e-4 or lower. Please do mesh independence study. 4. I think this FAQ is relevant: https://www.cfd-online.com/Wiki/Ansy...gence_criteria Svetlana |
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#3 | |
Senior Member
Join Date: Aug 2014
Location: Germany
Posts: 292
Rep Power: 14 ![]() |
Quote:
2) 80 Iterations is not really a lot. I rarely see simulations meeting the convergence criteria with this little amount of iterations, even with good initial values. 3) The graphs still indicate global convergence behaviour, so my advice would be to let it run further. 4) There is really no need to abort the simulation at this point since you are likely to improve result accuray with further iterations. 5) Always check for a flow quantity of interest, not just the residuals, to judge the level of convergence. |
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#4 |
Senior Member
Svetlana Tkachenko
Join Date: Oct 2013
Location: Australia, Sydney
Posts: 415
Rep Power: 14 ![]() |
Interesting note that it may converge in the future which I thought it wouldn't (your point number two). Thank you for this correction. I hope the author can check and confirm this.
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Tags |
convergence, iterations |
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