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zhuqw金蟲 (小有名氣)
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[求助]
熱應(yīng)力耦合失敗 已有1人參與
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做激光器工作時(shí)候熱應(yīng)力耦合的時(shí)候，前面溫度部分都算的好好的，到應(yīng)力部分的時(shí)候算了一會(huì)程序就崩潰了，ANSYS直接就自動(dòng)關(guān)了，只保存下來(lái)了溫度的數(shù)據(jù)。我查看了下錯(cuò)誤日志，不知道是不是因?yàn)槲以谇蠼獾臅r(shí)候，在底面施加溫度約束的時(shí)候用的命令錯(cuò)了？ 我用的是： /SOLU ANTYPE,STATIC TOFFST,273.15 DA,3,TEMP,25 是不是應(yīng)該改成這樣？ /SOLU ANTYPE,STATIC TOFFST,273.15 NSEL,S,LOC,Y,0 D,ALL,TEMP,25 ASEL,ALL 是不是在求解中，都要先選擇節(jié)點(diǎn)，然后再加載？不能選體或者面或者關(guān)鍵點(diǎn)？ 還有是不是我的網(wǎng)格畫的有問(wèn)題？ 下面是我的錯(cuò)誤日志，不知道導(dǎo)致ANSYS崩潰的原因到底是什么 *** WARNING *** CP = 64.834 TIME= 10:06:03 Shape testing revealed that 52605 of the 52605 new or modified elements violate shape warning limits. To review test results, please see the output file or issue the CHECK command. *** WARNING *** CP = 71.370 TIME= 10:06:08 Shape testing revealed that 52605 of the 52605 new or modified elements violate shape warning limits. To review test results, please see the output file or issue the CHECK command. *** WARNING *** CP = 108.249 TIME= 10:06:32 Shape testing revealed that 52605 of the 52605 new or modified elements violate shape warning limits. To review test results, please see the output file or issue the CHECK command. *** WARNING *** CP = 118.748 TIME= 10:06:38 Shape testing revealed that 42585 of the 52605 new or modified elements violate shape warning limits. To review test results, please see the output file or issue the CHECK command. *** WARNING *** CP = 129.450 TIME= 10:06:44 Shape testing revealed that 52605 of the 52605 new or modified elements violate shape warning limits. To review test results, please see the output file or issue the CHECK command. *** WARNING *** CP = 141.914 TIME= 10:06:52 Shape testing revealed that 42585 of the 52605 new or modified elements violate shape warning limits. To review test results, please see the output file or issue the CHECK command. *** WARNING *** CP = 154.550 TIME= 10:06:58 Shape testing revealed that 52605 of the 52605 new or modified elements violate shape warning limits. To review test results, please see the output file or issue the CHECK command. *** WARNING *** CP = 233.768 TIME= 10:07:33 Shape testing revealed that 571 of the 66864 new or modified elements violate shape warning limits. To review test results, please see the output file or issue the CHECK command. *** WARNING *** CP = 426.710 TIME= 10:10:36 Shape testing revealed that 35 of the 962864 new or modified elements violate shape warning limits. To review test results, please see the output file or issue the CHECK command. *** WARNING *** CP = 458.393 TIME= 10:10:56 Shape testing revealed that 43 of the 221575 new or modified elements violate shape warning limits. To review test results, please see the output file or issue the CHECK command. *** WARNING *** CP = 522.213 TIME= 10:11:17 Previous testing revealed that 348841 of the 2141200 selected elements violate shape warning limits. To review warning messages, please see the output or error file, or issue the CHECK command. *** WARNING *** CP = 2510.696 TIME= 10:17:27 Shape testing revealed that 348841 of the 2141200 new or modified elements violate shape warning limits. To review test results, please see the output file or issue the CHECK command. *** WARNING *** CP = 2511.445 TIME= 10:17:27 The ETCHG command has changed some element types. Please examine not only the KEYOPTs, but also the real constants, material properties, boundary conditions, and loadings, and then modify as needed. *** WARNING *** CP = 2514.564 TIME= 10:17:29 Both solid model and finite element model boundary conditions have been applied to this model. As solid loads are transferred to the nodes or elements, they can overwrite directly applied loads. *** WARNING *** CP = 2515.594 TIME= 10:17:29 Constraint on area 3 with inactive load label TEMP not transferred to nodes. *** WARNING *** CP = 2523.332 TIME= 10:17:32 Meshes made up of 10 percent or more of SOLID185 tetrahedra are not recommended. *** WARNING *** CP = 2535.219 TIME= 10:17:33 Previous testing revealed that 348841 of the 2141200 selected elements violate shape warning limits. To review warning messages, please see the output or error file, or issue the CHECK command. |
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zhuqw
金蟲 (小有名氣)
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5樓2015-12-01 14:26:54
shgao20
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專家經(jīng)驗(yàn): +809 - 仿真EPI: 1
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【答案】應(yīng)助回帖
★ ★ ★ ★ ★ ★ ★
感謝參與，應(yīng)助指數(shù) +1
zhuqw: 金幣+7, ★★★很有幫助 2015-12-08 15:50:38
感謝參與，應(yīng)助指數(shù) +1
zhuqw: 金幣+7, ★★★很有幫助 2015-12-08 15:50:38
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看來(lái)主要有兩個(gè)問(wèn)題： 1 單元的質(zhì)量不太好，最差的情況，52605 個(gè)單元竟有 52605 個(gè)單元超過(guò)了質(zhì)量警告限，而且你使用的 solid185 單元，它退化得到的四節(jié)點(diǎn)四面體單元，計(jì)算精度很差，最好改為 solid186 單元。 不過(guò)，你的單元數(shù)多的情況達(dá)到百萬(wàn)個(gè)，計(jì)算模型的規(guī)模已經(jīng)太大了，若改為 solid186 單元，規(guī)模 (主要是節(jié)點(diǎn)數(shù)) 會(huì)更大。最好對(duì)劃分網(wǎng)格改進(jìn)一下，既要減少不合格單元，又要設(shè)法使模型的規(guī)模盡量小一點(diǎn)。 2 應(yīng)力分析時(shí)使用 DA,... TEMP,... 和 D,..., TEMP,... 命令是不對(duì)的，應(yīng)力分析時(shí) D 和 DA 命令應(yīng)該用于位移約束，不能用來(lái)施加溫度載荷。溫度載荷應(yīng)該使用 BF 族命令 (如 BF、BFA 等) 來(lái)施加。 另外，計(jì)算中自動(dòng)退出 ANSYS，應(yīng)該是計(jì)算不收斂造成的，為了避免這一點(diǎn)，可以在求解前執(zhí)行命令： NCNV,2 這樣，計(jì)算不收斂時(shí)會(huì)終止計(jì)算但不退出 ANSYS，以便查找問(wèn)題。 |
2樓2015-11-29 10:53:01
zhuqw
金蟲 (小有名氣)
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謝謝您的指點(diǎn)。 我昨天又跑了一次，就在劃分網(wǎng)格后，進(jìn)行求解前執(zhí)行了NCNV,2命令，可是ANSYS還是崩潰自動(dòng)關(guān)閉了。。。。 還有想問(wèn)個(gè)問(wèn)題，我現(xiàn)在準(zhǔn)備改網(wǎng)格，改完以后我該如何評(píng)價(jià)自己的網(wǎng)格是不是比較合理的？ 就比如我現(xiàn)在用的這個(gè)網(wǎng)格，之前在求解溫度的時(shí)候并沒(méi)有出現(xiàn)ANSYS崩潰的問(wèn)題，所以我也沒(méi)注意錯(cuò)誤日志里的提示，不知道自己的網(wǎng)格出現(xiàn)了畫的多計(jì)算量太大問(wèn)題。。。知道做應(yīng)力出現(xiàn)程序崩潰我才注意到錯(cuò)誤日志里的提示的 |
3樓2015-12-01 09:58:22
4樓2015-12-01 10:46:33
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