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markwu4銅蟲 (著名寫手)
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[求助]
請有comsol license的人提供我Knowledgebase 103/952 已有2人參與
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有l(wèi)icense的人請?zhí)峁┪襅nowledgebase 103, 952內(nèi)容 http://www.comsol.com/support/knowledgebase/103/ http://www.comsol.com/support/knowledgebase/952/ 我算出負(fù)的濃度 聽說里面有一些技巧可以解決這類問題 |
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【答案】應(yīng)助回帖
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markwu4: 金幣+10, ★★★★★最佳答案, 謝謝 因?yàn)橐话胍呀?jīng)分給第一個應(yīng)助者 2014-10-16 06:48:48
markwu4: 金幣+10, ★★★★★最佳答案, 謝謝 因?yàn)橐话胍呀?jīng)分給第一個應(yīng)助者 2014-10-16 06:48:48
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Description Stationary models with high reaction rates, Ri, or more generally, large source terms, may result in convergence problems. You can for instance get error messages such as "No convergence, even when using the minimum damping factor", "NaN repeatedly found in solution", or "Error: Failed to find a solution". Now what could you do to get around this problem? Try to solve the problem using reduced source terms, and then gradually increase them, using the previous solution when solving, until you reach the solution to your original problem. The following approach uses the parametric solver to gradually increase the source term. COMSOL Multiphysics 4 and later Multiply the reaction (source) term (Ri) by a multiplication factor variable, for example "k". Click the Stationary node and select the Auxiliary sweep (in version 4.4) or Continuation (in earlier versions) check box. Enter k as the Sweep parameter In Parameter values, enter a range of increasing values, starting at a low value and increasing to unity, for example "1e-3 1e-2 1e-1 1". Click Compute. COMSOL Multiphysics 3.5a and earlier Multiply the reaction (source) term (Ri) by a multiplication factor variable, for example "k". In the *'Solver Parameters** dialog box, select the Parametric Solver and specify Name of Parameter to that of the multiplication factor, k. Enter the List of Parameter Values as a range of increasing values, starting at a low value and increasing to unity, for example "1e-3 1e-2 1e-1 1". Click OK. Click Solve. COMSOL Multiphysics will now start to solve the problem using the first multiplication factor. Then, if that works, the solution will be used as the initial guess for the next parameter value. This process will continue until the last parameter value is reached. Because you specified the last parameter value to be unity, the last solution will correspond to your original problem formulation. Use the time dependent solver. By making the problem time dependent, you usually get a smoother convergence. COMSOL Multiphysics 4 and later Right-click the Model node and select Add Study. Select Time Dependent and click Finish. In the Times edit field, enter a range of times to solve for, for example "0 1e3". Click Compute. COMSOL Multiphysics 3.5a and earlier Open Solver Parameters. Select the Time dependent solver and specify a range of Times to solve for, for example 0 1e3". Click OK, then Solve. Make sure to solve the problem for large enough times, such that the solution does not vary any longer. This implies that the solution has reached steady-state. Thus, COMSOL Multiphysics has calculated the stationary solution! If the solution process never gets past t = 0, see Solution 964 for more information. If none of the previous methods would help, try using them in combination with refining the mesh in regions where the source term is large. 這個是103的 |
4樓2014-10-16 06:14:44
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