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哪位虫友帮帮忙，我的comsol计算时出现如下错误
哪位虫友帮帮忙，我的comsol计算时出现如下错误，我的参数都输了啊，没有哪个地方提示有未知参数的，请帮帮忙！
这个错误不是很明显吗？没有定义刚度矩阵 : Originally posted by 梁学武lxw at
这个错误不是很明显吗？没有定义刚度矩阵 是啊，我知道啊，但是我翻来覆去得看，都没有发现有任何提示没定义的变量啊，就是所谓字体颜色变成橘色的，但是一计算就出错 : Originally posted by xuanyanghou at
是啊，我知道啊，但是我翻来覆去得看，都没有发现有任何提示没定义的变量啊，就是所谓字体颜色变成橘色的，但是一计算就出错... 橘色的字体是有问题的！ 发表一些我不成熟的看法，我也刚开始弄comsol不长时间，但是我发现好像这类问题有些时候并不是真正因为定义的错误，可能有其他方面的错误 我之前也碰到过这类问题，我的问题原因是模型几何特征，你可以把出问题的那几个坐标附近的网格重新建一下，我当时是把网格细化后，解决的问题 字体橘色是没有大问题的，这是单位问题，红色才是有问题的。你这个好像是不收敛！ 我也遇到过此类问题，不知道怎么设置的就解决了，再把条件改改试试吧！ 请问楼主解决了吗 楼主 你这个问题解决了吗？？？怎么解决的？？？comsol打开时出现错误_百度知道
再重新安装了，清理注册表，那当然是卸载软件您好
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TABLE2-5:SOLVERERRORMESS；ERRORNUMBERERRORMESSAGEE；7147Outofmemoryintime-de；memory.Seeerror7144regar；memory-savingtips.；Thestiffnessmatrix(Jacob；singularoralmostsingular；undefinedop
TABLE 2-5:
SOLVER ERROR MESSAGESERROR NUMBERERROR MESSAGEEXPLANATION7147Out of memory in time-dependent solverThe time-dependent solver ran out ofmemory. See error 7144 regarding generalmemory-saving tips.The stiffness matrix (Jacobian matrix) issingular or almost singular, which leads toundefined operations in the Incomplete LUpreconditioner’s back substitution.The name of a dependent variable in theManual scaling edit field on the Advancedpage in the Solver Parameters dialog boxdoes not match any of the dependentvariables in the model.One of the PARDISO reordering algorithmsfailed. Try a different reordering algorithmor try turning off row preordering.7165Incomplete LU back substitution failed7192Invalid degree of freedom name in manual scaling7199Reordering failed General ErrorsTABLE 2-6:
GENERAL ERROR MESSAGESERROR NUMBERERROR MESSAGEEXPLANATION9037Failed to initialize 3D graphics. OpenGL notfully supportedOpenGL is not available on the computer. This can happen if your graphics card doesnot support OpenGL or if you have a Unix/Linux computer where OpenGL has notbeen configured.You did not enter the correct server nameor server port when trying to connect aclient to a server.The client somehow lost the connection tothe server. For example, the server crashedunexpectedly, or the power savingmechanism on a laptop shut down the TCP/IP connection.9052Invalid address/port9084Server connection errorERROR MESSAGES | 445TABLE 2-6:
GENERAL ERROR MESSAGESERROR NUMBERERROR MESSAGEEXPLANATION9143License errorThe most common reasons for thismessage:The license file license.dat has beenremoved from the right directory in theCOMSOL software installation. Thelicense.dat file must be located in the$COMSOL34/license directory, where$COMSOL34 is the COMSOL 3.4installation directory.The license manager has not startedproperly. Please find the FLEXlm log file(named by the person who started thelicense manager). Inspect this file to see theserver status. Send it to if you are in doubtabout how to interpret this file.It is crucial that you use the correctlicense.dat file on both the server and theclients9178Error in callbackAn error occurred when calling a COMSOLScript or MATLAB function from COMSOLMultiphysics. Make sure that the M-file thatdefines the function is correct and exists inthe current path. Note that all inputs arevectors of the same size, and that theoutput should be a vector of the same size.446 | CHAPTER 2: DIAGNOSTICSSolver Error MessagesThese error messages can appear during solution and appear on the Log tab in the Progress window.TABLE 2-7:
SOLVER ERROR MESSAGES IN LOG WINDOWSOLVER ERROR MESSAGEEXPLANATIONCannot meet errortolerances. Increaseabsolute or relativetolerance.Error in residualcomputationError in JacobiancomputationThe time-dependent solver cannot solve the model to the specified accuracy. The evaluation of the residual or the Jacobian generated an error during a time-dependent solution. An additional message states the direct error. Some possible reasons are division by zero, range and overflow errors in mathematicalfunctions, and interpolation failure in coupling variableswith time-dependent mesh transformation.The nonlinear solver failed to converge. An additionalerror message gives some more details. See the descriptionfor that message.During a parametric solution, the nonlinear iteration didnot converge despite reducing the parameter step lengthto the minimum allowed value. The solution may havereached a turning point or bifurcation point.The nonlinear solver failed to converge for the initial valueof the parameter during a parametric solution. Anadditional error message gives some more details. See thedescription for that message.The time-dependent solver could not modify the initialconditions given to a DAE system to satisfy the stationaryequations at the initial time. Make sure the initial valuessatisfy the equations and boundary conditions. In manycases, this can be achieved by solving for only the algebraicvariables using a stationary solver before starting thetime-dependent solver.The preconditioner is ill-conditioned. The error in thesolution might not be within tolerances. To be sure to havea correct solution, open the Linear System Solver Settingsdialog box from the General tab of Solver Parameters.Select Linear system solver in the tree, and increase Factorin error estimate to the suggested number X. Alternatively,use a better preconditioner or tune the settings for thepreconditioner.Failed to find a solutionFailed to find a solution for all parameters, even when using the minimum parameter stepFailed to find a solution for initial parameterFailed to find consistent initial valuesIll-conditioned preconditioner. Increase factor in error estimate to XERROR MESSAGES | 447TABLE 2-7:
SOLVER ERROR MESSAGES IN LOG WINDOWSOLVER ERROR MESSAGEEXPLANATIONInf or NaN found, evenwhen using the minimumdamping factorDespite reducing the step size to the minimum value allowed, the solver cannot evaluate the residual or modified Newton direction at the new solution iterate.This essentially means that the current approximation tothe solution is close to the boundary of the domain wherethe equations are well-defined. Check the equations fordivisions by zero, powers, and other functions that canbecome undefined for certain inputs.In some mesh element near the given coordinates, the(curved) mesh element is (partially) warped inside-out.More precisely, the Jacobian matrix for the mapping fromlocal to global coordinates has a negative determinant atsome point. A possible reason is that the linear meshcontains a tetrahedron whose vertices all lie on aboundary. When improving the approximation of theboundary using curved mesh elements, the curved meshelement becomes inverted. To see whether this is the case,you can change Geometry shape order to 1 in the ModelSettings dialog box, which means that curved meshelements will not be used. You can usually avoid such badtetrahedra by using a finer mesh around the relevantboundary. Another reason for this error message can bethat the mesh becomes inverted when using a deformedmesh.The last time step returned from the time-dependentsolver is not to be trusted. Earlier time steps are within thespecified tolerances.When encountered during time-dependent solution: thelinear system matrix (which is a linear combination of themass-, stiffness-, and possibly, damping-matrices) is singular.Usually the problem originates from the algebraic part of aDAE. In particular, the cause can often be found in weakconstraints or constraint-like equations like the continuityequation in incompressible flow.The iterative linear system solver failed to compute aNewton direction in the specified maximum number ofiterations. Inverted mesh element near coordinates (x, y, z)Last time step is not converged.Matrix is singularMaximum number of linear iterations reached448 | CHAPTER 2: DIAGNOSTICSTABLE 2-7:
SOLVER ERROR MESSAGES IN LOG WINDOWSOLVER ERROR MESSAGEEXPLANATIONMaximum number ofNewton iterationsreachedThe nonlinear solver could not reduce the error below the desired tolerance in the specified maximum number of iterations. This is sometimes a sign that the Jacobian is notcomplete or badly scaled. It may even be almost singular, ifthe system is underdetermined. If the returned solutionseems reasonable, it might be enough to restart the solverwith this solution as the initial guess.The nonlinear solver reduced the damping factor belowthe minimum value allowed. The solver reduces thedamping factor each time a computed step did not lead toa decrease in the error estimate. Make sure the model iswell-posed, in particular that there are enough equationsand boundary conditions to determine all degrees offreedom. If the model is well-posed, it should have one ormore isolated solutions. In that case, the error is probablydue to the initial guess being too far from any solution.During a time-dependent solution, the nonlinear iterationfailed to converge despite reducing the time step to theminimum value allowed. Usually, the error is related to thealgebraic part of a DAE. For example, the algebraicequations can have reached a turning point or bifurcationpoint. The error can also appear when the algebraicequations do not have a unique solution consistent withthe given initial conditions. Make sure algebraic equationshave consistent initial values and that they have a uniquesolution for all times and values reached by the othervariables.When the eigenvalue solver terminated (stopped by theuser or due to an error), it had not found the requestednumber of eigenvalues. The eigenvalues returned can betrusted.After premature termination of the parametric solver, onlysome of the requested solutions have been computed.The solver computes the initial guess for the newparameter value based on the solution for the previousparameter value. This initial guess led to an undefinedmathematical operation. Try using another Predictor onthe Parametric tab of Solver Parameters.No convergence, even when using the minimum damping factorNonlinear solver did not convergeNot all eigenvalues returnedNot all parameter steps returnedPredicted solution guess leads to undefined function valueERROR MESSAGES | 449包含各类专业文献、生活休闲娱乐、行业资料、专业论文、文学作品欣赏、应用写作文书、中学教育、幼儿教育、小学教育、外语学习资料、96错误信息提示等内容。　
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用COMSOL计算模型的时候，出现如下错误，怎么办？
计算出现这样的错误：重复的错误测试失败，可能出现奇异
& && && && && && && && && && && &&&时间：0.724
& && && && && && && && && && && &&&最后一个时间步长不收敛
PS:我只是将参数设置中的一个参数值改小了，结果就出现这样的字样。。。
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如果是通过改参数引起的，我觉得肯定是你的那个参数在你的物理场里面有阈值，超出一定阈值范围之前设定的物理场不适合了。 收敛问题通常有两种情况，一是网格化不够密，另外就是在求解器中的相对容差设置得太大导致矩阵运算如LU分解时出现不收敛的情况。所以把网格画密了，再把相对容差改一下就可以解决问题了。 : Originally posted by relive012429 at
如果是通过改参数引起的，我觉得肯定是你的那个参数在你的物理场里面有阈值，超出一定阈值范围之前设定的物理场不适合了。 那这个应该怎么修改才可以收敛呢？？？？ : Originally posted by ronghan9276 at
收敛问题通常有两种情况，一是网格化不够密，另外就是在求解器中的相对容差设置得太大导致矩阵运算如LU分解时出现不收敛的情况。所以把网格画密了，再把相对容差改一下就可以解决问题了。 我修改了网格和相对容差&&还是不收敛、、、 : Originally posted by relive012429 at
如果是通过改参数引起的，我觉得肯定是你的那个参数在你的物理场里面有阈值，超出一定阈值范围之前设定的物理场不适合了。 我是将模型里面的磁场大小从8t改为1t后 就不收敛了 : Originally posted by 真de想ku at
那这个应该怎么修改才可以收敛呢？？？？... 那就需要你领域的专业知识了 : Originally posted by relive012429 at
那就需要你领域的专业知识了... 我只是将液体流动中的体积力里面的一个参数改小了，真不知道该怎么改了 楼主问题解决了吗？发生同样类似的问题 把运算时间改小，网格划分粗点，我做传热，这样改了一下，还好！