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bianborui88鐵蟲 (小有名氣)
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[求助]
Comsol仿真中出現(xiàn)問題!求助各位大牛。。。 已有1人參與
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Comsol仿真報錯!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 (著名寫手)

鐵蟲 (小有名氣)
至尊木蟲 (著名寫手)

木蟲 (正式寫手)
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結果無法收斂原因很多了 網格不夠細,參數不符合真實物理條件,模型建立中有錯誤(公式部分), 跟你的模型的幾何結構也有關系。 即便這些都沒有問題,你所采用的求解器也會有很大的影響。 舉個例子,我求解過一個穩(wěn)態(tài)問題,是多場耦合的。 如果我用segregated solver,總是無法收斂。 但是如果我用fully coupled solver,卻可以收斂。 還有一個能想到的原因就是,你的初始值的設置,越符合真實物理情況越好,越接近最終解越好(看你猜的本領了)。 調試時建議先從一個簡單的可行的model開始 |

木蟲 (正式寫手)
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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 (小有名氣)
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