Sometimes my models have temperatures below the lowest temperature load. How can this happen?
Here are four potential causes:
1. The most common cause of such a temperature anomaly is a poor mesh -- either too coarse a mesh, or poorly shaped elements within the mesh. Resolve the problem by improving the mesh.
2. In a nonlinear analysis (such as a model having temperature-dependent material properties), the convergence criterion might need to be tightened.
3. It is also possible for temperatures to go below the lowest defined temperature in the model (whether defined by D, convection, etc.) if you have a thermal boundary condition that is not temperature-bounded, such as a specified negative heat flux. The low temperature in this case would be expected.
4. This problem also was associated with a known error in an earlier version, which was fixed in 8.0. Reference KB Solution 276167 for details.