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5Â¥: Originally posted by ÎﻯÎﻯ at 2013-11-04 09:49:59
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10Â¥: Originally posted by ÕÕ¾µ×Ó2012 at 2013-11-04 19:06:11
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˵Õâô¶à»¹²»Èçͼ˵µÄ·½±ã£¬ÄãËãµÄʲôÑù£¬Ä£ÐÍ£¬ÊÕÁ²ÇúÏߣ¬°Ñͼ·ÅÉÏÀ´£¬ÁíÍ⣬Äã¶ÔÊÕÁ²µÄ¶¨ÒåÊÇʲô£¬Í¨¹ýʲô·½Ê½À´Åжϡ£¶ÔÓÚÓеı߽çÌõ¼þ£¬ÊÕÁ²ÇúÏßÊÇÓÀÔ¶´ï²»µ½ÄãÉèÖõÄÒªÇó£¬Óеļ´Ê¹´ïµ½ÁËҲδ±Ø¾ÍÊÇÊÕÁ²½á¹û£¬È¡¾öÓÚÄãµÄ³õʼ±ß½çÌõ¼þ£¬Ëã·¨µÈºÜ¶à·½Ãæ¡£Fluent ÀïÃæÊÇÕâô˵µÄ¡·
Note:  There are no universal metrics for judging convergence. Residual definitions that are useful for one class of problem are sometimes misleading for other classes of problems. Therefore it is a good idea to judge convergence not only by examining residual levels, but also by monitoring relevant integrated quantities and checking for mass and energy balances.
There are three indicators that convergence has been reached:
1£¬The residuals have decreased to a sufficient degree.
The solution has converged when the Convergence Criterion for each variable has been reached. The default criterion is that each residual will be reduced to a value of less than   , except the energy residual, for which the default criterion i,10e-6   .
2,The solution no longer changes with more iterations.
Sometimes the residuals may not fall below the convergence criterion set in the case setup. However, monitoring the representative flow variables through iterations may show that the residuals have stagnated and do not change with further iterations. This could also be considered as convergence.
3,The overall mass, momentum, energy, and scalar balances are obtained.
You can examine the overall mass, momentum, energy and scalar balances in the Flux Reports dialog box. The net imbalance should be less than 0.2    of the net flux through the domain when the solution has converged. In the next step you will check to see if the mass balance indicates convergence.
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Sometimes, however, this criterion may not be appropriate. Typical situations are listed below.

1£¬If you make a good initial guess of the flow field, the initial continuity residual may be very small leading to a large scaled residual for the continuity equation. In such a situation it is useful to examine the unscaled residual and compare it with an appropriate scale, such as the mass flow rate at the inlet.,
2£¬For some equations, such as for turbulence quantities, a poor initial guess may result in high scale factors. In such cases, scaled residuals will start low, increase as non-linear sources build up, and eventually decrease. It is therefore good practice to judge convergence not just from the value of the residual itself, but from its behavior. You should ensure that the residual continues to decrease (or remain low) for several iterations (say 50 or more) before concluding that the solution has converged.
GOOD LUCK!
15Â¥2013-11-06 00:38:18
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