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登錄The solver engine was unable to converge
關(guān)注創(chuàng)建者:Martin007 創(chuàng)建時(shí)間:2018-11-20

The solver engine was unable to converge的實(shí)例教程
報(bào)錯(cuò)內(nèi)容如下:
The solver engine was unable to converge on a solution for the nonlinear problem as constrained.
解決思路:對于這類求解不收斂問題,大多數(shù)原因在于接觸和約束,重點(diǎn)檢查模型的接觸是否合理正確。對于是否含有高級接觸,有不同的處理方法。下面分別討論:
1.模型中不含有高級接觸
(1)檢查約束:在結(jié)構(gòu)仿真中,檢查約束是否完全,是否能有效杜絕發(fā)生剛性運(yùn)動;(打開weak spring后在進(jìn)行計(jì)算,觀察是否報(bào)錯(cuò),如果不報(bào)錯(cuò),很有可能是此原因);
(2)檢查材料與對流曲線:在熱仿真中,檢查材料曲線或?qū)α髑€,觀察在溫度范圍內(nèi),是否出現(xiàn)急劇上升或下降,也就是材料曲線或者對流曲線有沒有尖點(diǎn);
(3)修改熱導(dǎo)屬性參數(shù):如果在涉及接觸的熱分析過程中遇到以上報(bào)錯(cuò),請考慮修改熱導(dǎo)屬性(thermal conductance)。
2.模型中含有高級接觸
(1)檢查約束:檢查是否有足夠的約束以防止剛性運(yùn)動;
(2)檢查載荷加載:檢查載荷是否合理。不同于線性問題,其結(jié)果將隨著載荷線性地?cái)U(kuò)展,高級接觸是非線性的,如果載荷太大或太小,就很可能出現(xiàn)收斂問題;(嘗試調(diào)小時(shí)間步)
(3)更改接觸類型:當(dāng)模型中滑動完全不受約束時(shí),即接觸類型是無摩擦,請嘗試將類型設(shè)置為粗糙,這會有助于一些問題的收斂;
(4)檢查接觸面網(wǎng)格:接觸面網(wǎng)格是否足夠精細(xì),過于粗糙的網(wǎng)格可能會導(dǎo)致不準(zhǔn)確的答案和收斂困難;
(5)調(diào)整接觸剛度值:考慮調(diào)整接觸剛度K值,一般調(diào)小。接觸剛度的默認(rèn)值為1,較小的KN將允許更多的接觸穿透,這可能導(dǎo)致不準(zhǔn)確,但有助于問題收斂。
(6)更改接觸行為:如果使用的是對稱接觸(默認(rèn)情況下接觸是對稱的),考慮使用非對稱接觸對。
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The solver engine was unable to converge的最新內(nèi)容
報(bào)錯(cuò)內(nèi)容如下:
The solver engine was unable to converge on a solution for the nonlinear problem as constrained.
解決思路:對于這類求解不收斂問題,大多數(shù)原因在于接觸和約束,重點(diǎn)檢查模型的接觸是否合理正確。對于是否含有高級接觸,有不同的處理方法。
NO.0049
Unable to mesh area 9 because of shape problems.
o Linear system solved using an iterative solver of the GMRES family that ensure great convergence speeds and stability.
o Direct Solver for small sized problems.
更多細(xì)節(jié)見cfx5stop(CFX-5 Solver and Solver Manager)。
5、我的求解不收斂。我應(yīng)當(dāng)怎樣做?
Achieving Convergence(CFX-5 Solver and Solver Manager)中給出了如何克服收斂中的困難的建議。
6、輸入的PLOT3D網(wǎng)格給出CFS-5求解器錯(cuò)誤。