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The presence of negative volume indicates that there are areas where the connections are incorrect, and the faulty regions can be displayed in the graphics window using Iso-Value Adaption. These negative volume regions must be removed before performing the calculation. The right-handed orientation of each face in the region is also checked; grids with negative volume will have a left-handed face. Pump Professionals | China Pump Technology Forum | China Pump Technology Network | China Pump Selection Network | Pump Forum | Pump and Valve Forum | Pump Technology Forum | Comprehensive Pump Forum | Pump Technology | Principles of Centrifugal Pumps | Pump Repair | Pump Prices | Classification of Pumps | Pumps and Valves | Pump Stations | Chemical Pumps | The online community for pump professionals | * n5 _' I2 @# b J* J1 j For axisymmetric cases, the number of nodes below the x-axis is listed. Since nodes below the x-axis are prohibited, and because the volume of an axisymmetric element is formed by rotating a 2D element’s volume, the volumes below the x-axis are all negative. For solution regions with rotational, periodic boundaries, the maximum, minimum, average, and specified periodic angles are all calculated; a common error is specifying the angle incorrectly. For regions with periodically transmitting boundaries, the boundary conditions are checked to ensure that the boundaries are truly periodic. Finally, the single counter is checked to confirm that the number of nodes, faces, and elements constructed by the solver matches the descriptions in the corresponding grid file header. If the grid check shows the following message: WARNING: node on face thread 2 has multiple shadows. You can perform repairs using the following text command: 1, for dual-type walls, grid_modify-zone_repair-duplicate-shadows. 2. For periodic walls, the command is the same as above, but you will be prompted to enter the rotation angle.