ansys_常见警告和错误（Ansys_ common errors and warnings）False possibility:1) a rigid body displacement occurs, adding constraints2) before solving merge or compression node3) there is no contact, and if the definition of contact is incorrect, a similar situation will occur4) this can happen if material properties are set incorrectly. For example, the density setting is too far off the mark;My own solution to this situation is to check the nodes without coupling; I've encountered this situation and finally found that the density is off the mark;2, Large, negative, pivot, value...May, be, because, of, a, bad, temperature-dependent, material, property, used,, in, the, model.The reason for this error is probably the lack of restraint!Please check the model carefully!I haven't met the problem yet3, after the beginning of the following tips,Solid, model, data, is, contaminatedFinally, I found out whyThe finite element mesh contains lines that are not divided into grids. In general, there is a coincidence between the faces, which leads to the fact that the mesh is divided into lines, but contains lines that have not been meshed.The solution is to store the model in.Cdb format (remove geometry information) and then read it to solve itCommand: cdwrite, DB, model name, CDBSounds good, but I haven't encountered it yet. After the partition, I use the NUMMRG command and merge elements to avoid this4, * * * WARNING * * *There are 79, small, equation, solver, pivot, terms.Several possibilities:1) the constraint is not enough, but the warning has 79 equations to appear small principal element, this one possibility is smaller, but may as well examine.2) the material parameter has the question, may examine the material data whether to lose the mistake.3) or some units did not make the material. You can use Select,Entities, ->, Element, ->, Attributes, ->, Material, Type, ->, and 0 (material number 0) to see if this is the case4) the structure is not one, that is, there are several independent entity groups, you can do modal analysis first to see if there is something alone vibration, or even fly out.I haven't had this problem, I hope5 、 appear frequently when importing the IGES fileBecause, keypoint, merging, has, been, performed, not, automatic, volume, creation, is, suppressedThis warning indicates that there is a coincidence point in the model. You can merge keypoint in ANSYSFor a slightly more complex model, IGES format is not recommended, either in PRT or.X-t formatIn addition, we recommend learning ANSYS WorkbenchIts interface is much better than ANSYS's.Did not encounter, it seems that practice or less, and more uphill to meet the tiger6, negative, radius, on, elementThe reason for the error of the negative radius:The axial symmetry problem in ANSYS is not the same as other software.Requirements must be Y Axis axis, and the model must be drawn on the positive half axis X, if your model to the negative half of XThere will be hints about the negative radius.Have encountered this problem,However, at that time did not figure out, and now understand, summed up the past, the perfect self7, input/output, error, on, unit=9., possible, full, diskProbably：1) the hard disk partition in the ANSYS working directory is full; (very likely)2) the system's virtual memory is full of hard disk partitions; (there is a certain possibility)3) the hard disk has bad sectors. (less likely)Sometimes is actually other errors (such as calculation and convergence), but false positives for disk space is not enough, therefore, need to observe the change process of disk space calculation, to determine whether the problem is indeed a disk space.Encountered this problem, but I do not know what the principle is solved, when the division is more, and then I reduce the unit to the previous 1/3, the results can be calculated. The remaining space of my disk has 100G, should not be first reasons, 2G memory, and the virtual memory is also adjusted, but still can not, so the second may also be smaller, as far as 3 is impossible8, when the grid is divided in ANSYS16, ANGLE, LESS, THAN, 2.5, DEGREES, FOUND, IN, TRIANGLE, FACETS, OF, VOLUME,, WITHSMALLEST, ANGLE, =1.2, POOR, ELEMENT, QUALITY, OR, MESH,, FAILURE, MAY, RESULT.What should I do to avoid this warning?. What is the problem if you ignore the solution?PS: when I use the automatic mesh model, there is the UG import, and the ANSYS version is 8The model directly imported must be repairedMerge the smaller line segmentsA few unimportant details are removedThen you can partition the meshDirect division must lead to the emergence of many distortion unitsNo, individuals tend to model directly9, Real, constant, set, -1, undefined, but, referenced,, by, elementThe element properties of the element quoted by unit 232 are out of order. The real constants of the units are usually checked. Does that define a problem?10, run after warning both solid loading model and finite element model boundary conditon have been apply to this model, as solid loads are transferred to the nodes or elements, they can overwrite directly applied loads this is to tell you, if you are on line or to face restrictions imposed by force or, rather than directly to the node the applied force or constraint. In the solution, it will force you to go to the node. Boolean, operation, Try, adjusting, the, tolerance, value, on, the, failed.BTOL, command, to, some, fraction, of, the, minimum, distance.Model, keypointSize (current, problem), 2.996529e+001, current, BTOL, setting1.000000e-005, minimum KPT distance 1.241535e-004. said the Boolean operation is the key point of the minimum distance between negligible exceeds the tolerance ANSYS by default, tolerance can be through the BTOL command to change the defaultby large Boolean operations,After that, the tolerance value is transferred back. The default tolerance value is 1E-5. Command format: BTOL, tolerance valueDiscontinuous, drag, line, pattern, for, ADRAG,, command, or, more, than, twoLines, attached, to, a, keypoint, in, the, drag, pattern., lineIn the process of dragging the line into line, if you want to drag more than one line at a time, you should note that the above error means that the object (line) is interrupted or that there is an intersection point with the path line. That is to say, if you want to drag more than one line at a time, you should ensure that these lines are continuous and do not intersect the path line.。
