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bianborui88鐵蟲(chóng) (小有名氣)
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[求助]
Comsol仿真中出現(xiàn)問(wèn)題!求助各位大牛。。! 已有1人參與
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Comsol仿真報(bào)錯(cuò)!如何解決? Error: Failed to find a solution: The relative error (6.1e-005) is greater than the relative tolerance. Returned solution has not converged. |
至尊木蟲(chóng) (著名寫(xiě)手)

鐵蟲(chóng) (小有名氣)
至尊木蟲(chóng) (著名寫(xiě)手)

木蟲(chóng) (正式寫(xiě)手)
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結(jié)果無(wú)法收斂原因很多了 網(wǎng)格不夠細(xì),參數(shù)不符合真實(shí)物理?xiàng)l件,模型建立中有錯(cuò)誤(公式部分), 跟你的模型的幾何結(jié)構(gòu)也有關(guān)系。 即便這些都沒(méi)有問(wèn)題,你所采用的求解器也會(huì)有很大的影響。 舉個(gè)例子,我求解過(guò)一個(gè)穩(wěn)態(tài)問(wèn)題,是多場(chǎng)耦合的。 如果我用segregated solver,總是無(wú)法收斂。 但是如果我用fully coupled solver,卻可以收斂。 還有一個(gè)能想到的原因就是,你的初始值的設(shè)置,越符合真實(shí)物理情況越好,越接近最終解越好(看你猜的本領(lǐng)了)。 調(diào)試時(shí)建議先從一個(gè)簡(jiǎn)單的可行的model開(kāi)始 |

木蟲(chóng) (正式寫(xiě)手)
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Both the segregated and couple fully coupled solvers require iterations for nonlinear problems. They both also can use direct or iterative linear solvers. The main difference is that the fully coupled solver operates on the full Jacobian matrix as one entity. The segregated solver splits the Jacobian matrix into smaller sub-problems, usually by degree of freedom type. Different solution strategies can then be used for each sub-problem. The optimal choice between segregated and fully coupled as well as the optimal segregation technique is problem specific. Usually, the fully coupled solver generally requires less iterations but takes up more memory and solution time per iteration. |

金蟲(chóng) (小有名氣)
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