comsol错误提示及解决方法(2)

coupling variable. Remove or rename one of the variables. 6170 Failed to evaluate variable An error occurred when evaluating the variable. The domains in which COMSOL Multiphysics tried to evaluate the variable are indicated. Also, the error message shows the expression that COMSOL Multiphysics was unable to evaluate. Make sure that you have defined the variables correctly in the indicated domains. 6176 An expression contains log(a), where a becomes negative Attempt to evaluate real or zero. To make the logarithm well-defined, make sure that a>0. Often, a becomes only slightly negative (due to logarithm of negative number approximations in the solution process). Then, a possible solution is to use log(a+e), where e is a small constant. Another remedy is to use log(abs(a)). If you do want to have a complex logarithm, go to the Advanced tab of Solver Parameters and select the Use complex functions with real input check box. 6177 Matrix has zero When the equations have a structure such that the stiffness on diagonal matrix (Jacobian matrix) has zeros on the diagonal, it is not possible to use the following linear system solvers/preconditioners/smoothers: all versions of SOR and Diagonal scaling (Jacobi). Try the Vanka preconditioner/smoother instead. 6188 Out of memory The software ran out of memory during assembly of the finite during assembly element model. See error 7144 regarding general memory-saving tips. 6194 An expression contains a^b, where a becomes negative and Attempt to b is not an integer. To make the power well-defined, make evaluate sure that a>0. Often, a becomes only slightly negative (due non-integral power of to approximations in the solution process). Then, a possible negative number solution is to use (a+e)^b, where e is a small constant. Another remedy is to use abs(a)^b. If you do want to have a complex number a^b, go to the Advanced tab of Solver Parameters and select Use complex functions with real input. 6199 The model contains a sqrt (square root) function that takes Attempt to evaluate real the square root of a negative number. Either make sure that square root of the square-root argument is nonnegative or select the Use negative number complex functions with real input check box on the Advanced tab in the Solver Parameters dialog box. 6204 Undefined function call An expression contains an undefined function name. Check that the function name is correct and that the function is in COMSOL Multiphysics’ or MATLAB’s path. 6206 Internal Not-A-Number (NaN) appears unexpectedly. A possible evaluation error: cause is improperly defined coupling variables. As a first step, unexpected NaN check that the definitions of the source and destination encountered domains of any coupling variables or periodic boundary conditions are correct. 6245 Unsupported Integration order is too high. For triangular elements the order integration order can be up to 10, and for tetrahedral elements the order can be up to 8. Find more information in the section “Numerical Quadrature” on page 505. 6259 Failed to evaluate variable Jacobian An error occurred when evaluating the Jacobian of the indicated variable. The domains in which COMSOL Multiphysics tried to evaluate the variable are indicated. Make sure that you have defined the variable correctly in the indicated domains. 7000—7999 Solvers and Preconditioners

TABLE 2-5: SOLVER ERROR MESSAGES ERROR NUMBER ERROR MESSAGE EXPLANATION 7001 Adaption only implemented for It is only possible to use adaptive mesh refinement in 3D for models using tetrahedral mesh elements. tetrahedral meshes Either turn off adaptive mesh refinement or switch from brick or prism elements to tetrahedral elements. 7002 Adaption only implemented for triangular meshes It is only possible to use adaptive mesh refinement in 2D for models using triangular mesh elements. Either turn off adaptive mesh refinement or switch from quadrilateral elements to triangular elements. 7022 Segregated solver steps The groups for the segregated solver do not include do not involve all of all dependent variables. One reason for this error solcomp could be that some boundary conditions (for example, for laminar inflow in fluid-flow models) add dependent variables that are not initially in the model. 7043 Initial guess leads to This error message usually appears when you have undefined function value set up an expression that returns “not a value,” that is, it is undefined, for the initial condition you have set. For instance, this happens if an expression contains a divisor that becomes zero or a logarithm of a negative value. To solve the problem, change the expression or the initial value so that the expression is well-defined when substituting the initial value of the variables. Also, watch out for warnings in the Log window. 7067 System matrix is zero This error message appears if there are no volume elements in the mesh. In the case that you have a mapped surface mesh, try sweeping or extruding the surface mesh to get a volume mesh. 7069 Maximum number of The iterative linear system solver did not converge linear iterations reached due to a bad initial guess or a bad preconditioner. Increase the limit on the number of linear iterations or use a better preconditioner. If possible, use a direct linear system solver. 7081 No parameter name given The parametric solver does not find a name for the parameter. Check the Name of parameter edit field on the General page of the Solver Manager. 7092 Out of memory in Algebraic multigrid The Algebraic multigrid solver/preconditioner ran out of memory. See error 7144 regarding general memory-saving tips. 7093 Out of memory during back substitution The solver ran out of memory during back substitution. See error 7144 regarding general memory-saving tips. 7094 Out of memory during LU factorization The solver ran out of memory during LU factorization. See error 7144 regarding general memory-saving t …… 此处隐藏：6963字，全部文档内容请下载后查看。喜欢就下载吧 ……