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紙鳶666銀蟲 (小有名氣)
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[求助]
燃燒計算，先收斂后發(fā)散
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我做加熱爐的燃燒模型，計算過程中收斂的挺好，在收斂快結(jié)束的時候能量方程開始發(fā)散，然后出錯終止。 我這個模型網(wǎng)格數(shù)多一點，有一百七十萬，不知道跟網(wǎng)格數(shù)或者問題的復(fù)雜程度有關(guān)系嗎？ 請高手予以解答，感激不盡~~ |
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xxflovezj520
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8樓2012-12-10 19:32:54
2樓2012-11-28 09:11:24
紙鳶666
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3樓2012-11-28 14:44:45
【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★
xiegangmai: 金幣+2, 謝謝參與 2012-11-28 22:03:31
紙鳶666: 金幣+4, ★★★很有幫助 2012-11-29 08:42:03
xiegangmai: 金幣+2, 謝謝參與 2012-11-28 22:03:31
紙鳶666: 金幣+4, ★★★很有幫助 2012-11-29 08:42:03
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用Fluent算過非預(yù)混燃燒，CFX還沒試過，看看這個對你有沒有用... 9.17.1. General Procedure for Running Simulations For many cases, such as the Combustion Tutorial, the run can be started using automatic initial guesses for most fields and the choice of model in the first part of the tutorial, (EDM) is the most robust of the combustion models. If you are having trouble getting a complex problem to converge, the following steps may aid convergence: Begin by specifying a single step reaction using the Eddy Dissipation Model. For initial conditions, specify Oxygen with a mass fraction of 0.232 and set each of the other species to Automatic. Allow the problem to converge to a reasonable level. Restart the problem with Finite Rate Chemistry or Finite Rate Chemistry/Eddy Dissipation Model using the results from the previous problem as an initial guess. Restarting the flamelet model from EDM does not work well because of the different model approach. This is because a previous EDM run would not provide mixture fraction mean and variance fields. Instead, it would be better to reduce the timestep for a few iterations. Combustion introduces a strong coupling between scalars, energy and momentum. In difficult problems, you may find it helps to calculate a cold flow solution before turning on combustion. In general for the Finite Rate Chemistry Model, the time scale of the combustion process is smaller, so you may have to continue with a smaller timestep to force the mass fraction and energy equations to converge. The time scale for the Eddy Dissipation Model is equal to the turbulence time scale (k/e). In some cases, it may be appropriate to use a larger time scale for the mass fraction equations. This is particularly true when there are regions of small flow velocity in the domain. In these cases, the time needed to convect the components into all areas of the domain may be relatively large. |
4樓2012-11-28 16:49:32
huchunxia
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5樓2012-11-28 19:03:05
5超7
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菜鳥
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http://www.gaoyang168.com/bbs/viewthread.php?tid=5233724&fpage=1 能不能指點一下我的帖子，我就是用fluent非預(yù)混算柴油燃燒的 |
6樓2012-11-28 19:15:01
紙鳶666
銀蟲 (小有名氣)
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7樓2012-11-29 08:41:11
9樓2013-04-19 15:13:36
huchunxia
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10樓2013-04-21 10:59:03
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